Science Combined
Science Combined
Science Combined
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SCIENCE (Theory) Class – X
Section A
Section B
25. When red litmus paper is added to limewater, then what will be the change in litmus paper?
Give reason. Write the chemical formula of limewater also.
26. A destarched leaf on a potted plant was covered with black (A), white (B) and transparent (C)
strips of paper as shown in the figure.
28. When the colour of pH paper becomes red, the solution is _________ and pH is between _________.
(a) strongly acid, pH = 1 to 2 (b) weakly acid, pH = 6 to 7
(c) strongly basic, pH = 12 to 13 (d) weakly basic, pH = 7 to 8
29. When SO2 gas is passed through acidified K2Cr2O7 solution:
(a) The solution becomes green due to formation of K2SO4.
(b) The solution becomes green due to formation of Cr2(SO4)2.
(c) The solution becomes yellow due to formation of K2SO4.
(d) The solution becomes red due to formation of Cr2(SO4)2.
30. SO2 gas should not be inhaled because:
(a) It is poisonous.
(b) It is acidic in nature.
(c) It is lighter than air.
(d) It is pungent smelling.
31. Growth hormone : Pituitary : Thyroxin : __________
(a) Thyroid (b) Parathyroid (c) Pancreas (d) Adernal
32. How many spinal nerves are present in human being:
(a) 31 pairs (b) 19 pairs (c) 27 pairs (d) 30 pairs
33. The rest positions of the needles in a Milliammeter and Voltmeter when not being used in a
circuit are as shown in the figure. The ‘zero error’ and ‘least count’ of these two instruments
are:
34. While performing the experiment on studying the dependence of current (I) on the potential
difference (V) across a resistor, four students I, II, III and IV set up the circuit is shown.
35. If the key in the arrangement is taken out (the circuit is made open) and magnetic field lines
are drawn over the horizontal plane, the lines are:
(a) concentric circles.
(b) elliptical in shape.
(c) straight lines parallel to each other.
(d) concentric circles near the point O but of elliptical shapes as we go away from it.
36. Fuel used in thermal power plants is:
(a) water (b) uranium (c) biomass (d) fossil fuels
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General Instructions:
Section A
1. What happens when Hydrogen combines with Oxygen in the presence of an electric current?
2. Why is nutrition necessary for an organism?
3. Why is tungsten metal selected for making filaments of incandescent lamp bulbs?
4. Write two observations you would make when quicklime is added to water.
5. Where does cerebrospinal fluid occur in our body? Mention any two of its functions.
6. Draw a sketch of the iron fillings as you spray them on a magnet.
7. (a) What is an ionic equation? Give an example.
(b) Write the name of following compounds:
(i) Mn(OH)2 (ii) FeCl3
8. (a) What is Double displacement reaction? Give an example.
(b) Write balanced equation:
Sodium + Water → Sodium hydroxide + Hydrogen
9. (i) What is the action on litmus of:
(a) Dry ammonia gas. (b) Solution of ammonia gas in water
(ii) State the observations you would make on adding ammonium hydroxide to aqueous
solutions of (a) Ferrous sulphate, (b) Aluminium chloride.
Or
Draw a diagram showing ‘Human respiratory system’. Label its following parts:
(i) Larynx (ii) Trachea (iii) Primary Bronchus (iv) Lungs
Why do the walls of the trachea not collapse when there is less air in it?
22. A household uses the following electric appliances:
(i) Refrigerator of rating 400 W for 10 hours each day.
(ii) Two electric fans of rating 80 W each for 6 hours daily.
Or
(i) The potential difference between two points in an electric circuit is 1 volt. What does is
mean? Name a device that helps to measure the potential difference across a conductor.
(ii) Why does the connecting cord of an electric heater not glow while the heating element
does?
(iii) Electric resistivities of some substances at 20o C are given below:
Silver 1.60 × 10−8 Ω m Copper 1.62 × 10−8 Ω m
Tungsten 5.2 × 10 −8 Ω m Iron 10.0 × 10−8 Ω m
Mercury 94.0 × 10 −8 Ω m Nichrome 100 × 10−6 Ω m
Answer the following questions using above data:
(a) Among Silver and Coper, which one is a better conductor and why?
(b) Which material would you advise to be used in electrical heating devices and why?
23. State Fleming’s Left hand rule. With a labelled diagram, describe the working of an electric
motor. What is the function of split ring commutator in motor?
Or
Explain with a neat diagram, the principle, construction and working of an A.C. generator.
24. What are magnetic field lines? How will you draw them? Write their characteristics.
Or
Show a domestic electric circuit with fuse, a bulb and a geyser from main electric line. Indicate
also the capacity of fuse used for geyser and the bulb.
SECTION – B
25. If we mix equal volume of 1 M NaOH solution with 1 M solution of HCl and then if we add blue
litmus into it, then what will be the change in litmus paper? Write the chemical reaction
involved.
26. In an experiment on photosynthesis, a student fixed a strip of black paper on the dorsal surface
of a Bougainvillea leaf in the morning. In the evening she tested the leaf for starch.
(a) What will be the result?
(b) Justify your answer
27. In the experiment on studying the dependence of current (I) on the potential difference (V),
three students plotted the following graphs between (V) and (I) as per their respective
observations.
28. Four students I, II, III and IV were asked to examine the changes for blue and red litmus paper
strips with dilute HCl (solution A) and dilute NaOH (solution B). The following observations
were reported by the four students. The sign ( − ) indicating no colour change.
(I) (II)
Litmus A B Litmus A B
Blue ---- Red Blue Red ----
Red ---- Blue Red ---- Blue
(III) (IV)
Litmus A B Litmus A B
Blue Red Red Blue Blue Blue
Red Blue Blue Red Red Red
30. When acidified potassium dichromate solution is added to a jar containing sulphur dioxide gas,
the solution becomes:
(a) colourless (b) brown (c) dark orange (d) green
31. Which structure out of I, II, III and IV marked in the given diagram of the epidermal peel of leaf
should be labelled as stoma:
34. To study the dependence of current (I) on the potential difference (V) across a resistor, two
students used the two set ups shown in figure (A) and (B) respectively. They kept the contact J
in four different positions, marked (i), (ii), (iii), (iv) in the two figures.
(a) (b)
For the two students, their Ammeter and Voltmeter readings will be minimum when the
contact J is in the position:
(a) (i) in both the set ups.
(b) (iv) in both the set ups.
(c) (iv) in set up (A) and (i) in set up (B)
(d) (i) in set up (A) and (iv) in set up (B)
35. A circular loop placed in a plane perpendicular to the place of paper carries a current when the
key is ON. The current as seen from points A and B (in the plane of paper and on the axis of the
coil) is anti-clockwise respectively. The magnetic field lines from B to A. The N-pole of the
resultant magnet is on the face close to:
General Instructions:
Section A
1. Define Electrolysis.
2. What is breathing?
3. A wire of resistance 10 Ω is bent in the form of a closed circle. What is the effective resistance
between the two points at the ends of any diameter of the circle?
4. A calcium compound which is a yellowish white powder is used as a disinfectant and also in
textile industry. Name the compound. Which gas is released when this compound is left
exposed to air?
5. Name the ovarian hormones and give the function of any one of them.
6. What is the difference between direct and alternating currents? Write one important
advantage of using alternating current.
7. Balance the ionic equation:
(a) Cu ( s ) + Ag +
→ Cu 2+ + Ag
(b) Al + H +
→ Al3+ + H 2
3+
(c) Fe + Cr → Fe 2 + + Cr 3+
8. Write one equation each for decomposition reactions where energy is supplied in the form of
heat, light or electricity.
9. (i) Differentiate between ‘strong’ and ‘weak’ electrolyte.
Or
(a) Crystal of copper sulphateare heated in a test tube for some time:
(i) What is the colour of copper sulphate crystals before heating and after heating?
Or
What method of concentration of ore is preferred in each of the following cases and why?
(i) The ore has higher density particles interspersed with a large bulk of low density
impurities.
(ii) The ore consists of copper sulphide intermixed with clay particles.
(iii) Give an example of amalgam.
21. (i) Name the blood vessel that brings oxygenated bloof to human heart.
(ii) Which chamber of human heart receives oxygenated blood?
(iii) Explain how oxygenated blood from this chamber is sent to all parts of the body.
Or
(i) Name the blood vessel that brings deoxygenated blood to human heart.
(ii) Which chamber of human heart receives deoxygenated blood?
(iii) Explain how deoxygenated blood from this chamber is sent to lungs for oxygenation.
22. (a) Name an instrument that measures electric current in a circuit. Define the unit of electric
current.
(b) What do the following symbols represent in a circuit diagram:
(i) (ii)
(c) An electric circuit consisting of a 0.5 m long Nichrome wire XY, an ammeter, a voltmeter,
four cells of 1.5 V each and a plug key was set up.
(i) Draw the electric circuit diagram to study the relation between the potential difference
maintained between the points X and Y and the electric current flowing through XY.
(ii) Following graph was plotted between V and I values using above circuit:
Or
23. What is electromagnetic induction? Give two methods of inducing electric current in a coil.
Explain each method with the help of diagram.
Or
Draw a labelled diagram of domestic circuit. What is the importance of earthing in a circuit?
24. State the principle on which an electromagnet works. Describe an activity to make an
electromagnet. Give two uses of electromagnet.
Or
Describe an activity to draw magnetic lines of force around a current carrying (a) straight
conductor, (b) circular loop.
Section B
28. Given below are the observations reported by four students I, II, III and IV for the changes
observed with dilute HCl or dilute NaOH and different materials.
Material DilHCl Dil. NaOH
I. Moist litmus paper Blue to red Red to blue
Does not react at room
II. Zinc metal React at room temperature
temperature
Remains clear and
III. Zinc metal on heating Liquid becomes milky
transparent
IV. Solid sodium bicarbonate No reaction Brisk effervescence
(a) I and II (b) II and III (c) I and III (d) II and IV
31. Medulla Oblongata is originated from:
(a) Mesoderm (b) Ectoderm (c) Endoderm (d) Ectomesoderm
32. The innermost layer of the human eye is:
(a) sciera (b) cornea (c) retina (d) lens
33. In the experiment on studying the dependence of current (I) on potential difference (V), four
student set up their circuits as shown below:
General Instructions:
Section A
Or
During the reaction of some metals with dilute hydrochloric acid, following observations were
made:
(i) Silver metal doesn’t show any change.
(ii) The temperature of reaction mixture rises when aluminium (Al) is added.
(iii) The reaction of sodium metal is found to be highly explosive.
(iv) Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.
(v) A gas produced when sodium carbonate is added to the acid.
Explain these observations giving suitable reasons.
20. Give reasons for the following:
(a) Metals conduct electricity.
(b) Metals generally do not form compounds with hydrogen.
(c) A piece of zinc placed in blue copper sulphate solution decolourize it.
(d) Alumina is dissolve in molten cryolite for electrolysis to obtain aluminium metal.
(e) Nitrogen gas is used to preserve food.
Or
(a) What is corrosion of metals? Name one metal which does not corrode and one which
corrodes on being kept in atmosphere.
(b) How will you show that the rusting of iron needs oxygen and moisture at the same time.
21. (a) Draw a diagram of human alimentary canal.
(b) Label oesophagus, Liver, Pancreas and Gall bladder on the diagram drawn.
(c) What is the function of enzyme ‘pepsin’ in the digestion process?
Or
(a) Draw a diagram of the human urinary system and label on it:
(i) Kidney (ii) Ureter (iii) Urinary bladder (iv) Urethra
(b) Name the two major components of normal human urine.
22. (a) What is the function of an earth wire in electrical instruments? Why is it necessary to earth
the metallic electric appliances?
(b) Explain what is short circuiting and overloading in an electric supply.
(c) What is the usual capacity of the fuse wire in the line to feed:
(i) Lights and fans?
(ii) Appliances of 2 kW or more power?
Or
Or
Explain why:
(a) It is difficult to burn a piece of wood fresh from a tree.
(b) Pouring dry sand over the fire extinguishes it.
(c) It is difficult to use hydrogen as a source of energy.
(d) Charcoal is considered a better fuel than wood.
Section B
General Instructions:
Section A
Or
What happens when zinc granules are treated with dilute solution of H2SO4, HCL, HNO3, NaCl
and NaOH? Also write the chemical equations if reaction occurs.
20. (a) What is an ‘activity series’ of metals? Arrange the metals Zn, Mg, Al, Cu and Fe in a
decreasing order of reactivity.
(b) What would you observe when you put:
(i) some zinc pieces into blue copper sulphate solution?
(ii) some copper pieces into green ferrous sulphate solution?
(c) Name a metal which combines with hydrogen gas. Name the compound formed.
Or
Describe with examples the following steps associated with the extraction of metals from their
ores:
(i) Froth-floatation process
(ii) Roasting of an ore
(iii) Calcinations of an ore
21. Explain the process of Photosynthesis in plants. List four factors which influence this process
and describe how each of them affects the rate of the photosynthesis process.
Or
List three differences between respiration in plants and respiration in animals. Describe with a
labelled diagram how gaseous exchange occurs through root hair in plants.
22. (i) State and prove the Joule’s law of heating.
(ii) Give the commercial unit of electrical energy and relate it to Joule.
(iii) When 40 W, 220 V bulbs are connected in series to a source of 220 V, find the current
flowing in each. If one of the bulb fuses, what will be the current drawn from the source of
220 V?
Or
(a) Give reason, explain how he resistivity of the conductor vary if:
(i) area is halved?
(ii) length is doubled?
(iii) area is doubled?
(iv) both area and length are doubles?
Or
A 60 W bulb is connected (i) in series and (ii) in parallel with a room heater and is further
connected across the mains. If 60 W bulb is now replaced by 100 W bulb in each case, will the
heat produced by heater be less or more? Give reason.
24. (a) What are Magnetic field lines? How is the direction of a magnetic field at a point
determined?
(b) Draw two field lines around a bar magnet along its length on its two sides and mark the
field directions on them by arrow marks.
(c) List any three properties of magnetic field lines.
Or
Why is pure iron not used for making permanent magnets? Name one materials used for
making permanent magnets.
Describe how permanent magnets are made electrically.
State two examples of electrical instruments made by using permanent magnets.
Section B
25. If phenolphthalein is added to dilute HCl, then what will happen? Justify your answer also.
26. (a) Why does plant cool the atmosphere?
(b) Define that term also.
27. The given wire made of material resistivity ' ρ ' is stretched to triple its length. Then what will
be new resistivity? Justify your answer also.
28. Conc. H2SO4 should be kept away from body because:
(a) it is oily liquid.
(b) it reacts with skin which gets burnt.
(c) of its pungent smell.
(d) it has high boiling point.
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General Instructions:
Section A
1. Calcium Oxide reacts with water to form Calcium hydroxide. What type of chemical reaction is
it?
2. Name the type of blood vessels which carry blood from organs to the heart.
3. Should the heating element of an electric iron be made of iron, silver or nichrome wire?
4. How is Plaster of Paris is different from gypsum? How may they be interconverted? Write one
use of Plaster of Paris.
5. What is phytohormone? Name any two phytohormone.
6. Differentiate between short circuiting and overloading of electric circuits. How does a fuse
protect an electric circuit.
7. Perform an activity to show that burning of sulphur in air is a combination reaction.
8. What are the differences between Displacement and Double displacement reactions? Write
examples also.
9. One day Lucky’s mother after taking meal felt pain and irritation in her stomach. His father was
out of station. He was an intelligent boy, He remembered his teacher’s statement and gave her
mother some baking soda solution, which gave her a relief from pain and irritation of stomach.
Read the above passage and answer the following questions:
(i) Which information given by the teacher help him to select the baking soda as remedy?
10. Write chemical equations for the following reactions takes place:
(i) A piece of calcium metal is placed in water.
(ii) Ammonia gas comes in contact with hydrogen chloride gas.
(iii) Sulphur is heated with concentrated H2SO4.
11. (a) How are metalloids different from metal? Name a metalloid.
(b) Differentiate between the roasting and calcinations processes used in metallurgy. Give an
example of each.
13. How does the blood circulate between lungs and heart in human beings? Give two functions of
lymph in human body.
14. Define nerve impulse. Which structure in a neuron helps to conduct a nerve impulse:
(i) towards the cell body.
(ii) away from the cell body
16. What is the relation for force experienced by a current carrying straight conductor placed in a
magnetic field? Under what condition is this force maximum?
17. Can any source of energy be pollution free? Why or why not?
18. What are the limitations of extracting energy from (i) wind, (ii) waves and (iii) tides?
19. Write the balanced chemical equations for the following and identify the type of reaction in
each case:
(a) Potassium bromide ( aq ) + Barium iodide ( aq )
→
Potassium iodide ( aq ) + Barium bromide ( s )
(b) Zinc carbonate ( s )
→ Zinc oxide ( s ) + Carbon dioxide ( g )
(c) Hydrogen ( g ) + Chlorine ( g )
→ Hydrogen chloride ( g )
20. (a) What is meant by refining of metals? In electrolytic refining of metal, name cathode, anode
and electrolyte used.
(b) Give four differences between properties of metals and non-metals.
(c) Give two differences between ionic compounds and covalent compounds.
Or
(a) What are salts? Give one example.
(b) Which of the following is strong acid, pH = 1 or pH = 6?
(c) Why should we add conc. H2SO4 to water and not water to conc. H2SO4 to get dil. H2SO4 ??
(d) Give one advantage of soap over detergent.
(e) Why should we not store sour things in copper vessels?
21. (i) State two structural differences between an artery and a vein.
(ii) Name a non-nucleated cell present in human blood and state one function of this cell.
(iii) Draw a labelled diagram of human heart.
Or
Name the main organs of the human digestive system in the order they participate in the
process of digestion. Describe how digestion of carbohydrates and proteins take place in our
body.
22. (a) List three sources of magnetic fields.
(b) State the rule to determine the direction of a:
(i) magnetic field produced around a straight conductor carrying current.
(ii) force experienced by a current carrying straight conductor placed in a magnetic field
which is perpendicular to it.
(iii) current induced in coil due to its rotation in a magnetic field.
Or
(a) Name some devices in which electric motor is used.
(b) A coil of insulated copper wire is connected to a galvanometer. What will happen if a bar
magnet is:
(i) pushed into the coil.
(ii) withdrawn from inside the coil.
(iii) held stationary inside the coil?
23. (a) Two identical resistors each of resistance 10 Ω are connected in (i) series, (ii) parallel to a
25. (a) A gas is neither combustible nor supporter of combustion, turn moist blue litmus paper
red, used in cold drinks. Identify this gas.
(b) Justify your answer also.
26. (i) To set up the experiment to show that light is necessary for photosynthesis, experimental
leaves should be taken for use from:
(a) Any flowering plant (b) Newly emerged sapling
(c) Destarched potted plant (d) Healthy plant growing on the plant
(ii) Give reason.
27. The current flowing through a conductor and the potential difference across its two ends are
as per readings of the ammeter and the voltmeter shown in the figure. Calculate the resistance
of the conductor
30. Four gas jar filled with sulphur dioxide gas were inverted into troughts of water by four
students and the following observations and inference were reported:
I. Water did not enter the gas jar and sulphur dioxide is insoluble in water.
II. A small amount of water entered the gas jar slowly and sulphur dioxide is sparingly
soluble in water.
III. Water rushed into the gas jar and sulphur dioxide is highly in water.
IV. Water did not enter the gas jar and sulphur dioxide is soluble in water.
31. In the experiment shown in the figure, water is found to rise in the bent tube:
For the two students, the value of emf used by student (A) and the resistance due to the
rheostat used by the student (B), will each be minimum when the contact J is in the position:
(a) (iv) in both the set ups.
(b) (i) in both the set ups.
(c) (iv) in set up (A) and (i) in set up (B)
(d) (i) in set up (A) and (iv) in set up (B)
34. An ammeter has 20 divisions between mark 0 and mark 2 on its scale. The least count of the
ammeter is:
(a) 0.02 A (b) 0.01 A (c) 0.2 A (d) 0.1 A
35. Which one of the following forms of energy leads to least environmental pollution in the
process of its harnessing and utilization:
(a) Nuclear energy (b) Thermal energy (c) Solar energy (d) Geothermal energy
36. Commercial electric motors do not use:
(a) an electromagnet to rotate the armature.
(b) effectively large number of turns of conducting wire in the current carrying coil.
(c) a permanent magnet to rotate the armature.
(d) a soft iron core on which the coil is wound.
1
(viii) Question numbers 11-17 in Section A and 26-29 in Section B are also
short answer questions. These are to be answered in 40-50 words each.
(ix) Question numbers 18-20 in Section A and 30 in Section B are long
answer questions. These are to be answered in 70 words each.
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(i) bl iz'u&i=k ds nks [k.M] v ,oa c gSaA vkidks nksuksa [k.Mksa ds iz'uksa ds mÙkj nsus gSaA
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[k.M ds iz'uksa ds mÙkj nsaA
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miyC/k gSaA ,sls iz'uksa esa vkidks fn, x, p;u esa ls dsoy ,d iz'u gh djuk gSA
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ds iz'u gSaA buesa izR;sd ds mÙkj 30 - 40 'kCnksa esa nsus gSaA
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izdkj ds iz'u gSaA buesa izR;sd ds mÙkj 40 - 50 'kCnksa esa nsus gSaA
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ds iz'u gSaA buesa izR;sd ds mÙkj 70 'kCnksa esa nsus gSaA
SECTION - A
[k.M µ v
1. Give an example of photochemical reactions. 1
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2. Name a metal which offers higher resistance to the passage of electricity than
copper. 1
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3. State a reaction in which SO2 acts as an oxidising agent. 1
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between the pole and the focus point of the mirror ? 1
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2
5. Which has a higher resistance : a 50 W lamp bulb or a 25 W lamp bulb and
how many times ? 1
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fdrus xquk gksxk \
6. How is plaster of Paris chemically different from gypsum ? How may they be
interconverted ? Write one use of plaster of Paris. 2
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ldrk gS \ IykLVj vkWQ isfjl dk dksbZ ,d mi;ksx fyf[k,A
7. Allotropy is a property shown by which class of substances, elements,
compounds or mixtures ? Give one example of allotropy. 2
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mnkgj.k fyf[k,A
8. Draw diagrams to distinguish between 'equatorial orbit' and 'polar orbit' of
artificial satellites of earth. 2
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9. With respect to air the refractive indices of water and benzene are 1.33 and 1.50
respectively. Calculate the refractive index of benzene with respect to water. 2
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csathu dk viorZukad ifjdfyr dhft,A
10. What is the cause of release of unusually large energies in unclear fission
reactions ? How is the energy per fission calculated ? 2
Or
What is a thermal neutron ? Draw a schematic diagram depicting fission of a
U-235 necleus on absorption of a thermal neutron.
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gS \ izfr fo[kaMu izkI; ÅtkZ dk ifjdyu dSls fd;k tkrk gS \
vFkok
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3
11. (a) State the relation between hydrogen ion concentration of an aqueous
solution and its pH.
(b) The pH of an aqueous solution decreases from 3 to 2. Calculate how many
times the hydrogen ion concentration of the solution will change. 3
¼v½ fdlh tyh; foy;u esa gkbMªkstu vk;uksa dh lkUnzrk rFkk foy;u ds pH eku ds chp dk
lEcU/k lw=k fyf[k,A
¼c½ ,d foy;u dh pH 3 ls 2 gks tkrh gA ifjdyu dhft, fd mlesa gkbMªkstu vk;uksa dh
lkUnzrk fdrus xquk cny tk,xhA
12. Explain the following regarding the manufacture of ammonia by Haber's process,
the reaction being :
N2 (g) + 3H2 (g) 2NH3 (g) + heat
(i) This reaction is carried out at a high temperature even though it is an
exothermic reaction.
(ii) To make ammonia, the mixture of N2 and H2 gases is passed over heated
iron. 3
gkcj fof/k }kjk veksfu;k ds mRiknu ls lEcfU/kr fuEufyf[kr ckrksa ds dkj.k Li"V dhft,A
vfHkfØ;k lehdj.k %
N2 (g) + 3H2 (g) 2NH3 (g) + Å"ek
(i) Å"ek{ksih gksrs gq, Hkh og vfHkfØ;k mPp rki ij fu;ksftr dh tkrh gSA
(ii) veksfu;k cukus ds fy, N2 vkSj H2 xSlksa ds feJ.k dks rIr vk;ju ij izokfgr fd;k tkrk
gS A
13. (i) Distinguish between an addition polymer and a condensation polymer.
(ii) Choose one condensation polymer and one addition polymer from amongst
the following :
nylon, teflon, neoprene, polyester
(iii) Write a chemical equation for the reaction involved in the formation of a
polyamide. 3
(i) ladyu cgqyd ,oa la?kuu cgqyd esa Hksn izdV dhft,A
(ii) fuEufyf[kr esa ls ,d la?kuu cgqyd vkSj ,d ladyu cgqyd dks pqfu;s %
uk;ykWu] Vs¶ykWu] U;wvksizhu] iksfy,LVj
(iii) iksfy,ekbM ds fuekZ.k ls lEcfU/kr jklk;fud vfHkfØ;k fyf[k,A
4
14. (a) Write the chemical equation representing the reaction for the preparation
of methanal from methanol.
(b) What happens when methanal is mixed with :
(i) Ammoniacal silver nitrate solution and the mixture is warmed.
(ii) Fehling's reagent and the mixture is warmed.
(c) Complete the reaction equation :
H
|
H—C=O + HCN → 3
Or
Write the formulae for the given compounds and name the functional groups
present in each of them :
(i) Ethanoic acid (ii) Propanone (iii) Nitromethane
¼v½ esFksukWy ls esFksuSy izkIr djus dh jklk;fud vfHkfØ;k dk lehdj.k fyf[k,A
¼c½ D;k ns[kk tk;sxk tc esFksuSy dks %
(i) veksfu;ke; flYoj ukbVªsV foy;u ds lkFk feydj xje fd;k tkrk gSA
(ii) Qsfyax vfHkdeZd ds lkFk feydj xje djrs gSaA
¼l½ fuEufyf[kr vfHkfØ;k lehdj.k dks iwjk dhft, %
H
|
H—C=O + HCN →
vFkok
fuEufyf[kr ds lw=k vkSj muesa mifLFkr vfHky{kdh; lewgksa ds uke fyf[k, %
(i) ,Fksuksbd vEy (ii) izksisuksu (iii) ukbVªksehFksu
15. A torch bulb is rated 2.5 V and 750 mA. Calculate (i) its power, (ii) its
resistance and (iii) the energy consumed if this bulb is lighted for 4 hours. 3
VkWpZ ds ,d cYc ij 2.5 V vkSj 750 mA vafdr gSaA cYc dh (i) 'kfä (ii) bldk izfrjksèk
vkSj (iii) blds 4 ?k.Vs tyus ij mi;qä ÅtkZ dk ifjdyu dhft,A
16. Name three form in which energy from oceans is made available for use. What
are OTEC power plants ? How do they operate ? 3
ÅtkZ ds rhu :iksa ds uke fyf[k, tks egklkxjksa ls miyC/k gSaA OTEC 'kfä la;a=k D;k gSa \
;s fdl izdkj dk;Z djrs gSa \
5
17. Describe briefly the Big Bang Theory of the origin of universe. 3
fo'o dh LFkkiuk ls lEcfU/kr o`gr~ /kekdk fl)kUr dks la{ksi esa o.kZu dhft,A
18. (a) Write chemical equations for the reactions involved in obtaining pure
alumina from the mineral bauxite which has impurities of iron oxide and
silica.
(b) Draw a labelled diagram of the electrolytic tank cell used for the extraction
of aluminium from alumina. 5
Or
(a) What is corrosion of metals ? Name one metal which does not corrode
and one which corrodes on being kept in atmosphere.
(b) How will you show that the rusting of iron needs oxygen and moisture at
the same time.
¼v½ ckWDlkbV [kfut ls ftlesa vkbju vkWDlkbM vkSj flfydk dh v'kqf);ka gSa 'kq) ,sY;qfeuk
izkIr djus dh izfØ;k ls lEcfU/kr vfHkfØ;kvksa ds jklk;fud lehdj.k fyf[k,A
¼c½ ,sY;qfeuk ls ,sY;qfefu;e ds fu"d"kZ.k ds dke vkus okys fo|qr~ lsy dk ukekafdr fp=k
[khafp,A
vFkok
¼v½ /kkrqvksa dk la{kkj.k D;k crkrk gS \ uke fyf[k, ,d ,slh /kkrq dk tks la{kkfjr ugha gksrh
vkSj nwljh ,slh /kkrq tks ok;qe.My esa jgus ij la{kkfjr gks tkrh gSA
¼c½ vki dSls fl) djsaxs fd yksgs dks t+ax yxus ds fy, vkWDlhtu vkSj ty dh lkFk&lkFk
vko';drk gksrh gSA
19. (a) Explain the following terms used in relation to defects in vision and
corrections provided for them—
(i) Myopia (ii) Astigmatism (iii) Bifocal lenses (iv) Far sightedness.
(b) Describe with a ray diagram how a person with myopia can be helped by
spectacles. 5
Or
(a) What is a 'simple microscope' ? Draw diagrams to show the image formed
by a simple microscope with the eye focussed—
(i) on near point (ii) at infinity.
(b) What is the maximum magnification obtainable by a simple microscope ?
¼v½ n`f"V nks"kksa vkSj muds 'kks/ku lEcU/kh iz;qä fuEufyf[kr inksa dh O;k[;k dhft,
(i) ek;ksfi;k (ii) ,sfLVXesfVT+e (iii) f}Qksdlh ySal (iv) nwjn`f"Vrk
¼c½ fdj.k vkjs[k dh lgk;rk ls fn[kkb, fd ek;ksfi;k nks"k ls ihfM+r O;fä dh ,sud }kjk dSls
lgk;rk dh tk ldrh gSA
6
vFkok
¼v½ ,d ^ljy lw{en'khZ* D;k gksrk gS \ vkjs[kksa }kjk fn[kkb, fd tc vk¡[k
(i) fudV fcUnq ij (ii) vuUr ij
Qksdflr gksrh gS rks ljy lw{en'khZ }kjk izfrfcEc dSls curk gSA
¼c½ ,d ljy lw{en'khZ }kjk fdruk vf/kdre vko/kZu izkIr gks ldrk gS \
20. (a) What are 'magnetic field lines' ? How is the direction of a magnetic field
at a point determiend ?
(b) Draw two field lines around a bar magnet along its length on its two sides
and mark the field directions on them by arrow marks.
(c) List any three properties of magnetic field lines. 5
¼v½ ^pqEcdh; {ks=k js[kk,¡* D;k gksrh gSa \ fdlh fcUnq ij pqEcdh; {ks=k dh fn'kk dSls fu/kkZfjr
dh tkrh gS \
¼c½ ,d naM pqEcd dh yEckbZ dh fn'kk esa Åij vkSj uhps nks {ks=k js[kk,¡ [khap dj mu ij {ks=k
fn'kkvksa dks rhu fpÌ }kjk fn[kkb,A
¼l½ pqEcdh; {ks=k js[kkvksa ds dksbZ rhu xq.k/keZ fyf[k,A
SECTION - B
[k.M µ c
21. Write the expanded form of the abbreviation AIDS. 1
la{ksi AIDS dks QSyk dj fyf[k,A
22. Why is one arm in sub-metacentric chromosome longer than the other ? 1
mie/;dsUnzh xq.klw=k esa ,d Hkqtk nwljh ls yEch D;ksa gksrh gS \
23. What is 'Green House Effect' ? 1
^ikS/kk?kj izHkko* D;k gksrk gS \
24. What is 'eutrophication' ? Write its two harmful effects. 2
^lqiks"k.k* D;k gS \ blds nks gkfudkjd izHkko fyf[k,A
25. List any four practices which help in protecting our environment. 2
Or
Describe any four modes of disposal of waste.
,sls pkj vkpj.kksa dh lwph cukb, tks i;kZoj.k laj{k.k esa lgk;d gksrs gSaA
vFkok
oT;Z ds fuiVku dh fdUgha pkj fof/k;ksa dk o.kZu dhft,A
7
26. What is 'translocation' ? Why is it essential for plants ? Where in plants are
the following synthesized : 3
(i) Sugars (ii) Hormones
Or
What is 'clotting of blood' ? Write a flow chart showing major events taking
place in clotting of bood.
^LFkkukUrj.k* D;k gksrk gS \ ;g ikS/kksa ds fy, D;ksa vko';d gS \ ikS/kksa esa fuEufyf[kr ds
la'ys"k.k dgk¡ gksrs gSa %
(i) 'kdZjk (ii) gkWeksZu
vFkok
^#f/kj dk teuk* D;k vFkZ j[krk gS \ #f/kj ds teus ds eq[; pj.k ,d izokg pkVZ }kjk
fn[kkb,A
27. Draw a diagram of human brain and label on it the following of its parts :
(i) Cerebrum (ii) Meninges (iii) Medulla Oblongata (iv) Cerebellum 3
ekuo efLr"d dk ,d vkjs[k [khap dj ml fuEufyf[kr efLr"d ds Hkkx ukekafdr dhft, %
(i) izefLr"d (ii) efLr"dkoj.k (iii) esMqyk vkWCykaxsVk (iv) vuqefLr"d
28. Differentiate between 'self pollination' and 'cross pollination'. Describe 'double
fertilisation' in plants. 3
^Lo&ijkx.k* ,oa ^ij&ijkx.k* esa vUrj Li"V dhft,A ikS/kksa dh ^nksgjh fu"kspu* fof/k dk o.kZu
dhft,A
29. What is 'organic evolution' ? How do embryological studies provide evidence
for evolution ? 3
^tSo fodkl* D;k gksrk gS \ Hkwz.kh; v/;;u fdl izdkj fodkl dk izek.k izLrqr djrs gSa \
30. Explain the process of 'photosynthesis' in plants. List four factors which
influence this process and describe how each of them affects the rate of the
photosynthesis process. 5
ikS/kksa esa ^izdk'kla'ys"k.k* ds izØe dks le>kb;sA izdk'kla'ys"k.k dks izHkkfor djus okys fdUgha pkj
dkjdksa ds uke fyf[k, vkSj o.kZu dhft, fd buesa ls izR;sd izdk'kla'ys"k.k dh nj dks fdl izdkj
izHkkfor djrk gSA
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8
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SCIENCE AND TECHNOLOGY (Theory)
Delhi — 2006
General Instructions:
1. The question paper comprises two Sections, A and B. You are to attempt both the Sections.
2. The candidates are advised to attempt all the questions of Section A separately and Section B
separately.
3. All questions are compulsory.
4. There is no overall choice. However, internal choice has been provided in some questions. You
are to attempt only one option in such questions.
5. Marks allocated to every question are indicated against it.
6. Question numbers 1—4 in Section A and 17— 18 in Section B are very short answer questions
and are of 1 mark each. These are to be answered in one word or one sentence each.
7. Question numbers 5—8 in Section A and 19— 20 in Section B are short answer questions and
are of 2 marks each. These are to be answered in 30—40 words each.
8. Question numbers 9—14 in Section A and 21—23 in Section B are also short answer questions
and are of 3 marks each. These are to be answered in 40—50 words each.
9. Question numbers 15—16 in Section A and 24 in Section B are long answer questions and are of
5 marks each. These are to be answered in 70 words each.
SECTION – A
SECTION – B
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31/1/1 1 [P.T.O.
lkekU; funsZ'k %
(i) bl iz'u&i=k ds nks [k.M] v ,oa c gSaA vkidks nksuksa [k.Mksa ds iz'uksa ds mÙkj nsus gSaA
(ii) vkidks fdlh ,d [k.M ds lHkh iz'uksa ds mÙkj ,d lkFk fy[kus ds i'pkr~ gh nwljs [k.M ds iz'uksa ds
mÙkj nsus gSaA
(iii) lHkh iz'u vfuok;Z gSaA
(iv) bl iz'u&i=k esa dksbZ O;kid p;u ugha gSA rFkkfi dqN iz'uksa esa oSdfYid vUr% p;u miyC/k gSaA ,sls
iz'uksa esa vkidks fn, x, p;u esa ls dsoy ,d iz'u gh djuk gSA
(v) izR;sd iz'u ds fy, fu;r vad mlds lkeus n'kkZ, x, gSaA
(vi) [k.M v ds iz'u la[;k 1&4 rFkk [k.M c ds iz'u la[;k 17] 18 vfr y?kq mÙkj izdkj ds iz'u gSaA
bu iz'uksa ds mÙkj ,d 'kCn rFkk ,d okD; esa nsus gSaA
(vii) [k.M v ds iz'u la[;k 5&8 rFkk [k.M c ds iz'u la[;k 19] 20 y?kq mÙkj izdkj ds iz'u gSaA buesa
izR;sd ds mÙkj 30&40 'kCnksa esa nsus gSaA
(viii) [k.M v ds iz'u la[;k 9&14 rFkk [k.M c ds iz'u la[;k 21&23 Hkh y?kq mÙkj izdkj ds iz'u gSaA buesa
izR;sd ds mÙkj 40&50 'kCnksa esa nsus gSaA
(ix) [k.M v ds iz'u la[;k 15] 16 rFkk [k.M c dk iz'u la[;k 24 nh?kZ mÙkj izdkj ds iz'u gSaA buesa
izR;sd ds mÙkj 70 'kCnksa esa nsus gSaA
SECTION A
[k.M v
1. Classify the following reactions into slow and fast reaction :
(i) Reaction between an acid and a base,
(ii) Rusting of iron. 1
fuEufyf[kr vfHkfØ;kvksa dks /kheh ,oa rhoz vfHkfØ;k ds oxks± esa ck¡fV;s %
(i) fdlh vEy dh fdlh {kkjd ds lkFk vfHkfØ;kA
(ii) vk;ju dk taxhdj.kA
2. Give the names of the functional groups
(i) — CHO
|
(ii) — C=O 1
fuEufyf[kr vfHky{kdh; lewgksa ds uke fyf[k, %
(i) — CHO
|
(ii) — C=O
3. What is a Galaxy ? 1
xSysDlh fdls dgrs gSa \
31/1/1 2 [P.T.O.
4. What is the S.I. unit of electric potential ? 1
fo|qr foHko dk S.I. ek=kd D;k gS \
6. What is Tollen’s reagent ? What would you observe on heating Tollen’s reagent with
formalin in a test tube ? 2
VkWysu vfHkdeZd fdls dgrs gSa \ ,d ij[kuyh esa VkWysu vfHkdeZd ds lkFk Q+kWesZfyu dks xeZ djus
ij vki D;k izsf{kr djsaxs \
7. Distinguish between polar and equatorial orbits for artificial satellites. Illustrate the
two orbits on a diagram. 2
Ñf=ke mixzgksa dh /kzqoh; rFkk fo"kqorh; d{kkvksa esa varj crkb;sA ,d vkjs[k }kjk nksuksa d{kkvksa dks
fn[kkb;sA
9. (Name the raw materials that are required for the manufacture of washing soda by
Solvay Process. Describe the chemical reactions involved in the process. 3
lkWYos izØe }kjk /kkou lksMk ds mRiknu ds fy;s vko';d dPps inkFkks± ds uke fyf[k;sA bl izØe
esa gksus okyh jklk;fud vfHkfØ;kvksa dk o.kZu dhft,A
31/1/1 3 [P.T.O.
10. What is ‘liquor ammonia’ ? Describe with a diagram, ‘Fountain Experiment’ to
demonstrate the following properties of ammonia :
(i) high solubility in water.
(ii) its alkaline nature. 3
^fydj veksfu;k* D;k gS \ veksfu;k ds fuEufyf[kr xq.kksa dks n'kkZus ds fy;s vkjs[k dh lgk;rk ls
^QOokjk iz;ksx* dk o.kZu dhft, %
(i) ty esa veksfu;k dh mPp ?kqyu'khyrkA
(ii) veksfu;k dh {kkjh; izÑfrA
12. A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall
object be placed so that it forms an image at 15 cm from the lens ? Also calculate the
size of the image formed. 3
,d vory ysal dh Qksdl nwjh 20 lseh gSA 5 lseh Å¡pkbZ dh fdlh oLrq dks ysal ls fdruh nwjh
ij j[ksa fd oLrq dk izfrfcac ysal ls 15 lseh nwjh ij cus \ cuus okys izfrfcac dk vkeki Hkh ifjdfyr
dhft,A
13. (a) Why is the Solar Cooker box covered with a plane glass plate ?
(b) Why is energy of water flowing in a river considered to be an indirect form of
Solar energy ?
(c) How is the fission of nucleus brought about ? 3
¼v½ ckWDluqek lkSj dqdj dk eq¡g dk¡p dh IysV ls D;ksa <¡drs gSa \
¼c½ ufn;ksa esa cgrs ty dh ÅtkZ dks lkSj ÅtkZ dk gh vizR;{k :i D;ksa ekuk tkrk gS \
¼l½ ukfHkd dk fo[k.Mu fdl izdkj fd;k tkrk gS \
31/1/1 4 [P.T.O.
14. (a) What is meant by ‘Electric Resistance’ of a conductor ?
(b) A wire of length L and resistance R is stretched so that its length is doubled and
the area of cross-section is halved. How will its :
(i) resistance change ?
(ii) resistivity change ? 3
15. (a) Name one main ore of Aluminium. Write its formula. Which two main impurities
are associated with this ore ?
(b) Describe with chemical equations, the method employed for the enrichment of the above
named ore.
OR
(a) Why is sulphuric acid called ‘King of Chemicals’ ?
(b) Describe the three chemical reactions that take place during the conversion of
sulphur dioxide to sulphuric acid in the ‘Contact Process’.
(c) Why should water be never added dropwise to concentrated sulphuric acid ? 5
¼v½ ,syqfefu;e ds ,d eq[; v;Ld dk uke rFkk lw=k fyf[k;sA bl v;Ld dh nks izeq[k v'kqf);ksa
ds uke fyf[k,A
¼c½ mijksDr v;Ld dh le`f) ftl fof/k ls dh tkrh gS mldk o.kZu jklk;fud lehdj.kksa lfgr
dhft,A
vFkok
¼v½ lY¶;wfjd vEy dks ^jlk;uksa dk jktk* D;ksa dgrs gSa \
¼c½ ^laLi'kZ&izØe* }kjk lYQj MkbvkWDlkbM ds lY¶;wfjd vEy esa ifjofrZr gksrs le; gksus okyh
rhu jklk;fud vfHkfØ;kvksa dk o.kZu dhft,A
¼l½ ty dks dHkh Hkh cw¡n&cw¡n djds lkUnz lY¶;wfjd vEy esa D;ksa ugha Mkyuk pkfg, \
31/1/1 5 [P.T.O.
16. Define the term, ‘Critical Angle’. What is meant by ‘total internal reflection’ ? State two
essential conditions for total internal reflection to take place. With the help of a ray
diagram, illustrate an application of total internal reflection.
OR
(a) What is meant by a ‘magnetic field’ ?
(b) How is the direction of magnetic field at a point determined ?
(c) Describe an activity to demonstrate the direction of the magnetic field generated
around a current carrying conductor.
(d) What is the direction of magnetic field at the centre of a current carrying circular
loop ? 5
^Økafrd dks.k* dh ifjHkk"kk fyf[k,A ^iw.kZ vkarfjd ijkorZu* dk D;k vFkZ gS \ iw.kZ vkarfjd ijkorZu
gksus ds fy, vko';d nks 'krs± fyf[k,A fdj.k vkjs[k dh lgk;rk ls iw.kZ vkarfjd ijkorZu ds fdlh
mi;ksx dks Li"V dhft,A
vFkok
¼v½ pqacdh; {ks=k dk D;k vFkZ gS \
¼c½ fdlh fcanq ij pqacdh; {ks=k dh fn'kk dk irk fdl izdkj yxkrs gSa \
¼l½ fdlh /kkjkokgh pkyd ds pkjksa vksj mRiUu gksus okys pqEcdh; {ks=k dh fn'kk dks n'kkZus ds fy,
,d fØ;kdyki dk o.kZu dhft,A
¼n½ ,d /kkjkokgh ywi ¼ik'k½ ds dsUnz ij pqacdh; {ks=k dh fn'kk D;k gksrh gS \
SECTION B
[k.M c
17. Name the term for transport of food from leaves to other parts of the plant. 1
ifÙk;ksa ls ikni ds vU; Hkkxksa rd Hkkstu igq¡pus dh izfØ;k dk uke fyf[k,A
18. What is a neuron ? 1
raf=kdksf'kdk D;k gS \
19. Describe the mechanism of blood clotting. 2
OR
State the two vital functions of the human kidney. Name the procedure used in the working
of artificial kidney. 2
#f/kj dk FkDdk cuus dh fØ;k fof/k dk o.kZu dhft,A
vFkok
euq"; ds o`Dd ds nks izeq[k dk;ks± dk mYys[k dhft,A Ñf=ke o`Dd esa fdl rduhd dk mi;ksx fd;k
tkrk gS \
31/1/1 6 [P.T.O.
20. Name the two hormones secreted by pancreas. Write one function of each hormone
named. 2
vXU;k'k; ls lzkfor gksus okys nks gkeksZuksa ds uke fyf[k,A bu nksuksa gkeksZuksa dk ,d&,d dk;Z crkb;sA
21. (a) What is fertilization ? Distinguish between external fertilization and internal fertilization.
(b) What is the site of fertilization in human beings ? 3
¼v½ fu"kspu dh ifjHkk"kk fyf[k,A cká fu"kspu rFkk vkarfjd fu"kspu esa Hksn dhft,A
¼c½ ekuo esa fu"kspu dgk¡ gksrk gS \
31/1/1 7 [P.T.O.
24. (a) Draw a diagram of a ‘palisade cell’.
(b) Label vacuole, chloroplast, cell wall and cytoplasm on the diagram drawn.
(c) Name the two stages in photosynthesis. 5
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31/1/1 1 [P.T.O.
lkekU; funsZ'k %
(i) bl iz'u&i=k ds nks [k.M] v ,oa c gSaA vkidks nksuksa [k.Mksa ds iz'uksa ds mÙkj nsus gSaA
(ii) vkidks fdlh ,d [k.M ds lHkh iz'uksa ds mÙkj ,d lkFk fy[kus ds i'pkr~ gh nwljs [k.M ds iz'uksa ds
mÙkj nsus gSaA
(iii) lHkh iz'u vfuok;Z gSaA
(iv) bl iz'u&i=k esa dksbZ O;kid p;u ugha gSA rFkkfi dqN iz'uksa esa oSdfYid vUr% p;u miyC/k gSaA ,sls
iz'uksa esa vkidks fn, x, p;u esa ls dsoy ,d iz'u gh djuk gSA
(v) izR;sd iz'u ds fy, fu;r vad mlds lkeus n'kkZ, x, gSaA
(vi) [k.M v ds iz'u la[;k 1&4 rFkk [k.M c ds iz'u la[;k 17] 18 vfr y?kq mÙkj izdkj ds iz'u gSaA
bu iz'uksa ds mÙkj ,d 'kCn rFkk ,d okD; esa nsus gSaA
(vii) [k.M v ds iz'u la[;k 5&8 rFkk [k.M c ds iz'u la[;k 19] 20 y?kq mÙkj izdkj ds iz'u gSaA buesa
izR;sd ds mÙkj 30&40 'kCnksa esa nsus gSaA
(viii) [k.M v ds iz'u la[;k 9&14 rFkk [k.M c ds iz'u la[;k 21&23 Hkh y?kq mÙkj izdkj ds iz'u gSaA buesa
izR;sd ds mÙkj 40&50 'kCnksa esa nsus gSaA
(ix) [k.M v ds iz'u la[;k 15] 16 rFkk [k.M c dk iz'u la[;k 24 nh?kZ mÙkj izdkj ds iz'u gSaA buesa
izR;sd ds mÙkj 70 'kCnksa esa nsus gSaA
SECTION A
[k.M v
1. Classify the following reactions into slow and fast reaction :
(i) Reaction between an acid and a base,
(ii) Rusting of iron. 1
fuEufyf[kr vfHkfØ;kvksa dks /kheh ,oa rhoz vfHkfØ;k ds oxks± esa ck¡fV;s %
(i) fdlh vEy dh fdlh {kkjd ds lkFk vfHkfØ;kA
(ii) vk;ju dk taxhdj.kA
2. Give the names of the functional groups
(i) — CHO
|
(ii) — C=O 1
fuEufyf[kr vfHky{kdh; lewgksa ds uke fyf[k, %
(i) — CHO
|
(ii) — C=O
3. What is a Galaxy ? 1
xSysDlh fdls dgrs gSa \
31/1/1 2 [P.T.O.
4. What is the S.I. unit of electric potential ? 1
fo|qr foHko dk S.I. ek=kd D;k gS \
6. What is Tollen’s reagent ? What would you observe on heating Tollen’s reagent with
formalin in a test tube ? 2
VkWysu vfHkdeZd fdls dgrs gSa \ ,d ij[kuyh esa VkWysu vfHkdeZd ds lkFk Q+kWesZfyu dks xeZ djus
ij vki D;k izsf{kr djsaxs \
7. Distinguish between polar and equatorial orbits for artificial satellites. Illustrate the
two orbits on a diagram. 2
Ñf=ke mixzgksa dh /kzqoh; rFkk fo"kqorh; d{kkvksa esa varj crkb;sA ,d vkjs[k }kjk nksuksa d{kkvksa dks
fn[kkb;sA
9. (Name the raw materials that are required for the manufacture of washing soda by
Solvay Process. Describe the chemical reactions involved in the process. 3
lkWYos izØe }kjk /kkou lksMk ds mRiknu ds fy;s vko';d dPps inkFkks± ds uke fyf[k;sA bl izØe
esa gksus okyh jklk;fud vfHkfØ;kvksa dk o.kZu dhft,A
31/1/1 3 [P.T.O.
10. What is ‘liquor ammonia’ ? Describe with a diagram, ‘Fountain Experiment’ to
demonstrate the following properties of ammonia :
(i) high solubility in water.
(ii) its alkaline nature. 3
^fydj veksfu;k* D;k gS \ veksfu;k ds fuEufyf[kr xq.kksa dks n'kkZus ds fy;s vkjs[k dh lgk;rk ls
^QOokjk iz;ksx* dk o.kZu dhft, %
(i) ty esa veksfu;k dh mPp ?kqyu'khyrkA
(ii) veksfu;k dh {kkjh; izÑfrA
12. A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall
object be placed so that it forms an image at 15 cm from the lens ? Also calculate the
size of the image formed. 3
,d vory ysal dh Qksdl nwjh 20 lseh gSA 5 lseh Å¡pkbZ dh fdlh oLrq dks ysal ls fdruh nwjh
ij j[ksa fd oLrq dk izfrfcac ysal ls 15 lseh nwjh ij cus \ cuus okys izfrfcac dk vkeki Hkh ifjdfyr
dhft,A
13. (a) Why is the Solar Cooker box covered with a plane glass plate ?
(b) Why is energy of water flowing in a river considered to be an indirect form of
Solar energy ?
(c) How is the fission of nucleus brought about ? 3
¼v½ ckWDluqek lkSj dqdj dk eq¡g dk¡p dh IysV ls D;ksa <¡drs gSa \
¼c½ ufn;ksa esa cgrs ty dh ÅtkZ dks lkSj ÅtkZ dk gh vizR;{k :i D;ksa ekuk tkrk gS \
¼l½ ukfHkd dk fo[k.Mu fdl izdkj fd;k tkrk gS \
31/1/1 4 [P.T.O.
14. (a) What is meant by ‘Electric Resistance’ of a conductor ?
(b) A wire of length L and resistance R is stretched so that its length is doubled and
the area of cross-section is halved. How will its :
(i) resistance change ?
(ii) resistivity change ? 3
15. (a) Name one main ore of Aluminium. Write its formula. Which two main impurities
are associated with this ore ?
(b) Describe with chemical equations, the method employed for the enrichment of the above
named ore.
OR
(a) Why is sulphuric acid called ‘King of Chemicals’ ?
(b) Describe the three chemical reactions that take place during the conversion of
sulphur dioxide to sulphuric acid in the ‘Contact Process’.
(c) Why should water be never added dropwise to concentrated sulphuric acid ? 5
¼v½ ,syqfefu;e ds ,d eq[; v;Ld dk uke rFkk lw=k fyf[k;sA bl v;Ld dh nks izeq[k v'kqf);ksa
ds uke fyf[k,A
¼c½ mijksDr v;Ld dh le`f) ftl fof/k ls dh tkrh gS mldk o.kZu jklk;fud lehdj.kksa lfgr
dhft,A
vFkok
¼v½ lY¶;wfjd vEy dks ^jlk;uksa dk jktk* D;ksa dgrs gSa \
¼c½ ^laLi'kZ&izØe* }kjk lYQj MkbvkWDlkbM ds lY¶;wfjd vEy esa ifjofrZr gksrs le; gksus okyh
rhu jklk;fud vfHkfØ;kvksa dk o.kZu dhft,A
¼l½ ty dks dHkh Hkh cw¡n&cw¡n djds lkUnz lY¶;wfjd vEy esa D;ksa ugha Mkyuk pkfg, \
31/1/1 5 [P.T.O.
16. Define the term, ‘Critical Angle’. What is meant by ‘total internal reflection’ ? State two
essential conditions for total internal reflection to take place. With the help of a ray
diagram, illustrate an application of total internal reflection.
OR
(a) What is meant by a ‘magnetic field’ ?
(b) How is the direction of magnetic field at a point determined ?
(c) Describe an activity to demonstrate the direction of the magnetic field generated
around a current carrying conductor.
(d) What is the direction of magnetic field at the centre of a current carrying circular
loop ? 5
^Økafrd dks.k* dh ifjHkk"kk fyf[k,A ^iw.kZ vkarfjd ijkorZu* dk D;k vFkZ gS \ iw.kZ vkarfjd ijkorZu
gksus ds fy, vko';d nks 'krs± fyf[k,A fdj.k vkjs[k dh lgk;rk ls iw.kZ vkarfjd ijkorZu ds fdlh
mi;ksx dks Li"V dhft,A
vFkok
¼v½ pqacdh; {ks=k dk D;k vFkZ gS \
¼c½ fdlh fcanq ij pqacdh; {ks=k dh fn'kk dk irk fdl izdkj yxkrs gSa \
¼l½ fdlh /kkjkokgh pkyd ds pkjksa vksj mRiUu gksus okys pqEcdh; {ks=k dh fn'kk dks n'kkZus ds fy,
,d fØ;kdyki dk o.kZu dhft,A
¼n½ ,d /kkjkokgh ywi ¼ik'k½ ds dsUnz ij pqacdh; {ks=k dh fn'kk D;k gksrh gS \
SECTION B
[k.M c
17. Name the term for transport of food from leaves to other parts of the plant. 1
ifÙk;ksa ls ikni ds vU; Hkkxksa rd Hkkstu igq¡pus dh izfØ;k dk uke fyf[k,A
18. What is a neuron ? 1
raf=kdksf'kdk D;k gS \
19. Describe the mechanism of blood clotting. 2
OR
State the two vital functions of the human kidney. Name the procedure used in the working
of artificial kidney. 2
#f/kj dk FkDdk cuus dh fØ;k fof/k dk o.kZu dhft,A
vFkok
euq"; ds o`Dd ds nks izeq[k dk;ks± dk mYys[k dhft,A Ñf=ke o`Dd esa fdl rduhd dk mi;ksx fd;k
tkrk gS \
31/1/1 6 [P.T.O.
20. Name the two hormones secreted by pancreas. Write one function of each hormone
named. 2
vXU;k'k; ls lzkfor gksus okys nks gkeksZuksa ds uke fyf[k,A bu nksuksa gkeksZuksa dk ,d&,d dk;Z crkb;sA
21. (a) What is fertilization ? Distinguish between external fertilization and internal fertilization.
(b) What is the site of fertilization in human beings ? 3
¼v½ fu"kspu dh ifjHkk"kk fyf[k,A cká fu"kspu rFkk vkarfjd fu"kspu esa Hksn dhft,A
¼c½ ekuo esa fu"kspu dgk¡ gksrk gS \
31/1/1 7 [P.T.O.
24. (a) Draw a diagram of a ‘palisade cell’.
(b) Label vacuole, chloroplast, cell wall and cytoplasm on the diagram drawn.
(c) Name the two stages in photosynthesis. 5
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• 15 minutes time has been allotted. to read this question paper. The question
paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the
students will read the question paper only and will not write any answer
on the answer script during this period.
• rpr:rr ~ CR ~ fCfi ~ ~--q;r if ~ ~ 16 % I
SUMMATIVE ASSESSMENT - II
~ tRt8;lT - II
SCIENCE
~
Time allowed : 3 hours Maximum Marks: 80
f.:rt:Tfmr m:3 EfUZ 31f~*: 80
31/1 1 P.T.D.
General Instructions :
(i) The question paper comprises of two sections, A and B. You are to
attempt both the sections.
(ii) All questions are compulsory.
(iii) There is no overall choice. However, internal choice has been
provided in all the three questions of five marks category. Only one
option in such questions is to be attempted.
(iv) All questions of Section A and all questions of Section B are to be
attempted separately.
(v) Questions number 1 to 4 in Section A are one mark questions.
These are to be answered in one word or one sentence.
(vi) Questions number 5 to 13 in Section A are two mark questions.
These are to be answered in about 30 words each.
(vii) Questions number 14 to 22 in Section A are three mark questions.
These are to be answered in about 50 words each.
(viii) Questions number 23 to 25 in Section A are five mark questions.
These are to be answered in about 70 words each.
(ix) Questions number 26 to 41 in Section B are multiple choice
questions based on practical skills. Each question is a one mark
question. You are to select one most appropriate response out of the
four provided to you.
flllIJ"4 ~ :
(i) ~ J{R W q;J- rfr ~ 'J1T7T 3T 3ft;: 'J1T7T ~ -q ~ 7J7JT ~ I 3flTTCiiT qJ;ff ri
it m= it dnl: fffisl;f ~ I
(ii) ~ J{R 31f.:rqp;f ~ I
(iii) 9! J{R W TN q;Jf 'f/7R JITCff "#f ~ rp:;g qfq-qfq. ajq?f .it ffR m= -q J{R
#trrtt 'f/7R kl1T 7J7JT ~ I F m= -q 3TfTl item" J{R #trrtt 1J!Ji 'f/7R q;J- dnl:
fffisl;f it fffi!: ¥ -m ~ I
(iv) 3flTTCiiT 'J1T7T 3T 3ft;: 'J1T7T q it ~ m= it dnl: Y2fc!f-~ 'J1T7T ~ TN fffisl;f m I
30-30 ~ -q ~ ~ I
(v ii) 'J1T7T 3T it J{R if&:rT 14 if 22 it J{R ffR- ffR ajq?f it ~ I ~ dnl: "WTo/T
50-50 ~ -q ~ ~ I
(viii) 'J1T7T 3T it J{R if&:rT 23 if 25 it J{R qfq-qfq ajq?f it ~ I ~ dnl: "WTo/T
70 ~ -q ~ ~ I
(ix) 'J1T7T q it J{R if&:rT 26 if 41 it J{R >l4JJ/1I4Cfl ~TN ~ ~gmCflflil
J{R ~ I ~ J{R lJ:C/i 3i$ q;r ~ I f0: 7fit rm: mCflc4r -q if .irft:rcit item" lJ:C/i
w:r# ~ fcrq;c;q" ~ ~ I .
31/1 2
SECTION A
~31
5. How does the valency of elements vary (i) in going down a group, and
(ii) in going from left to right in a period of the periodic table ? 2
~ ~ -q mqT q,1 B41\JiCf)dl -q ~ qf{Cld" irnr ~,
(i) fcfiBt qrf -q ~ .-B ~ ~ -q ?
(ii) fcfiBt ~ -q ~ -B ~ ~ -q ?
31/1 3 p.T.a.
9. Expl~in with the help of a diagram, how we are able to observe the
sunrise about two minutes before the sun gets above the horizon.
~ ~ ~ ~ ~ fcIi Ql1 ~ >rcl1T\ ~ cn1 CJl«fCl if ~ il; ~ -B
~rnil;cJfiRz~m~~~ I
10. List any, four reasons for vegetative propagation being practised in the
growth of some type of plants. '
'¥9 >rcl1T\ il; ~ il; q~ if ~ (vegetative) W.f~ ~ ~ il; coW ~ Cfif{UT
~I
11. Describe the role of fallopian tubes in the female reproductive system.
11TGf ~ ('P:f if q;<11RFH-~3TI Ch1 ~ cpr cruR ~ I
12. List any four disadvantages of using fossil fuels for the production of
energy.
~ ~ il; fC;m: \jjlql~41 ~~ il; m Ch1cnW ~ ~ ~
31/1 4
15. The atomic number of an element'is 16. Predict
(i) the number of valence electrons in its atom
(ii) its valency
(iii) its group number
(iv) whether it is a metal or a non-metal
(v) the nature of oxide formed by it
(vi) the formula of its chloride 3
~ cnq CflT 'WiTUJ ~ 16 ~ I ~ ~ if ~ ~
(i) ~ W1TUJ if B~I'JjChdl ~c'1~T.{jCh1 ~
(ii) ~ Blil'JjChdl
16. An object is placed between infinity and the pole of a convex mirror.
Draw a ray diagram and also state the position, the relative size and
.the nature. of the image formed. 3
~ ~ cit ~ ~ ~ ~ 31rRf 3ih: ~ (<TIB) ~ ~ "&f ~ ~ I~ ~ if
~ -rnT ~ ~ 5lRifdl~ ~ fu"Q: ~ fq;r ~ 31R 5lrdfdl~ ~ ~ if ~
- ~ ~) ~ ~ ~ 31R ~ ~ I
17. What is the principle of reversibility of light? Show that the incident
ray of light is parallel to the emergent ray of light 'Yhen light falls
obliquely on a side of a rectangular glass slab. 3
>[q)ffi Ch1 3ffilliOnlJdJ (reversibility) CflT ~ cp:rr ~ ? ~ fcfi ~ >[q)ffi ~
fcfBr 31llJdIChI{ rilf ~ ~~ m1 11\ ~ ~ mm~ "ill ~>[q)ffi-~
f.:rfu >[q)ffi ~ ~ flli HH '?rill ~ I .
18. What eye defect is myopia ? Describe with a neat diagram how this
defect of vision can be corrected by using a suitable lens. 3
RcR: Wt! ~ ~ ~ ~ ~ ? ~ ~ fq;r ~ flli$il~q: fcfi ~ ~ CflT m
~ tB ~ ~ ~~ CflT f.:1 q I{O I fcfi<:rr ~ 'W;fi'ill ~ J
19. What does HIV stand for? Is AIDS an infectious disease? List any
four modes of spreading AIDS. 3
HIV cp:rr ~e, CRffi ~ ? Cf<IT AIDS ~ B~lliCh WI ~ ? AIDS ~ ~. Ch1 q;){
31/1 5 P.T.D.
••
20. Describe any three ways in which individuals with· a particular trait
may increase in population. 3
~ <fR ~ fclf~ CflT crrR ~ ~ M fcmcr :rrr (fcl ~l tlCfl) ~ oqfu) arq-;ft
~ett-m~m~ I
21. State the evidence we have for the origin of life from inanimate matter. 3
~ ~ ~ ~ QW-'q. ~ ill ~ W1TUT CflT ~ ~ I
22. What are fossils? What do they tell us about the process of evolution? 3
~lql~!Ol q:<:JT~ ~ ? ~ mm ~ ill ~ -B ~ q:<:JT~ ~ ?
23. (a) State two properties of carbon which lead to a very large number
of carbon compounds.
(b) Why does micelle formation take place when soap is added to
water? Why are micelles not formed when soap is added to
ethanol? 5
OR
(C4HlO)
ill m
B!Ollqllqdl ett ~
B!Ollqllfcl'4"j
~',
'ett ~
B!Ollqllfcl'4l
~ ~
ett ~
I
-:qr: fcl~ltldl~ ~ I ~
31/1 6
(a) Draw a ray diagram to show the formation of image of an object
placed between infinity and the optical centre of a concave lens.
(b) A concave lens of focal length 15 em forms an image 10 em from
the lens.
Calculate
(i) the distance of the object from the lens
(ii) the magnification for the image formed
(iii) the nature of the image formed 5
(en) (~ cn1 ~ ("CfICR)' -B CFIT ~ ~ ~ ?
3l~
~if;~~~m~ I
~ I
qRCf)f~d ~
(i) ~ -B ~q,1 ~
(ii) mtd" 5IfCif&tkl if; ~ ~
25. With the help of suitable diagrams, explain the varIOUS steps of
budding in Hydra. 5
OR
What is binary fission in organisms ? With the help of suitable
?iagrams, describe the mode of reproduction in Amoeba. 5
.~ ~ q,1 flQI?1dl -B ~ (Hydra) if; ~ (Cf)(1?1I'iI) if; ~ TRUTf cn1 ~
~I '
3l~
~ if fu-~ (binary fission) fW:rr CFIT ~ ~ ? ~ ~ cn1 fltil?1dl -B ~
if ~ ~ CfiT quf.:r ~ I
31/1 7 p.T.a.
SECTION B
'iWT 6f
26. To find the focal length of a concave mirror, Sita should choose which
one of the following set-ups ? 1
(A) A mirror holder and a screen holder
(B) A screen holder and a scale
(C) A mirror holder, a screen holder and a scale
(D) A screen, a mirror, holders for them and a scale
~ QPTT ?
(A) ~ ~ m 3fu:~ W m
(B) ~ ~m3fu:
'1~1 . ~ ~
(C) ~ ~ m, ~ w m 3fu:~ ~
(D) ~ W, ~.~, ~ Wm: m 3fu:~ ~
27. By using a convex lens, a student obtained a sharp image of his
class-room window grill on a screen. In which direction should he move
the lens to focus a distant tree instead of the grill ? 1
(A) Towards the screen
(B) Away from the screen
(C) Very far away from the screen
(D) Behind the screen
(A) ~ ett 3W
(B) ~ ~ ~
(C) ~ ~ ~ ~
(D) ~ ~ -qm
31/1 8
28. To determine the focal length of a convex lens by obtaining a sharp
image of a distant object, the following steps were suggested which are
not in proper sequence :
I. Hold the lens between the object and the screen.
II. Adjust the position of the lens to form a sharp image.
III. Select a suitable distant object.
IV. Measure the distance between the lens and the screen.
The correct sequence of steps to determine the focal length of the
lens is 1
29. In these diagrams, the angle of refraction r has been correctly marked
in which diagram ? 1
I II III IV
(A) I (B) II
(C) III (D) IV
31/1 9 p.T.a.
I II III IV
(A) I (B) II
(C) III (D) IV
,.
the lateral displacement was correctly measured as 1
(A) AB (B) PQ
(C) CD (D) PR
::: I"
(C) CD (D) PR
31/1 10
31. Iron nails were dipped in an aqueous solution of copper sulphate. After
about 30 minutes, it. was observed that the colour of the solution
changed from 1
(A) colourless to light green.
(B) blue to light green.
(C) blue to colourless.
(D) green to blue.
~~~fcn
(D) m amQ(jfl1f.111~ ~ ~ ~ I
31/1 11 p.T.a.
••
33. Vapours of acetic acid smell
1
(A) pungent like vinegar.
(A) ~ ~ cmm I
(B) ~ ~ mcft I
(D) ~~~ I
~mt-mt
(A) m-r~-B- -rtB
mt-mtcfurm
m-r ~ Th:r~I~~I.
'1~1~1~2:
1~~1~2:
m-r -I m 12
(D)
(B)
31/1
35. A student added acetic acid to test tubes I, II, III and IV containing
the labelled substances and then brought a burning splinter near the
mouth of each test tube.
II III IV
(A) I
(B) II
(G) III
(D) IV
I II III IV
(B) II
(C) III
(D) IV
31/1 13 P.T.O.
36. The shape of yeast cell is 1
(A) only spherical.
(B) only oval.
(C) irregular.
(D) both oval and spherical.
~-(~) ~ ~ 3Wfifu m-ffi ~
(A) ~ JTh.'1ICflI\I
(B) ~~I
37. The steps involved in observing a slide under a microscope are given
below. They are not in proper sequence.
I. Focus the object under high power of the microscope.
II. Place the slide on the stage of the microscope.
III. Arrange the mirror to reflect maximum light to the slide.
IV. Focus the object under low power of the microscope.
The proper sequence of steps is 1
(A) II, III, IV, I
(B) I, II, III, IV
(C) IV, III, II, I
(D) III, I, II, IV
~ ~ q;) ~ if ~ ~ TRITT ~ fu'@ %, ~ ~ 9011 .~ ~ ~
II. ~q;)~~mr'R~ I
III. GLfuT ~ q;) f.i<1f~d ~ ~ 'R ~~ >rcIim ~ I
~"itT~~~
(A) II, III, IV; I ••••. 1
; t·
(D) III, I, II, IV
31/1 14
D"- - ...•.••~ _
38. Theillustrate
.given
binary
figuresIIfission
IIIIV in in improper
Aunoeba
(~
~~
G]8
The correct order is 1
(1\) III, IV, II, I
(B) IV, III, II, I
(C) II, III, IV, I
(I)) I, III, IV, II
ctt Tf{ 3i11lRp"i1 if ~ ~ fu-~ CfiT ~ w:r ~ 1"fCTI ~
GJ8~~~
I II III IV
~w:rQTrrr
(1\) III, IV;II, I
(B) IV,III, II, I
(C) II, III, IV, I
(I)) I, III, IV;II
(C) m 1U m ~ -qi ~ ~ ~ I
(I)) ~ ~, ~ ~ ~ 3th: cfR m (fq) ~ ~ ~ I
31/1 15 P.T.D.
40. The colour of raisins as used in the experiment, 'to determine the
percentage of water absorbed by raisins' was 1
(A) white
(B) yellow
(C) dark brown
(D) pink
TCj)~lf~~1 ~ ~ wr ~ ~ CflT ~ m cnG' ~ m -ij ~ fctJ~lfiJ~1~ ~
CflT ~ mm ~
(A) ~
(B) 1fu;rr
(C) ~ ~ \
(D) ~ {
41. Following are the steps iI).volvedin the experiment 'to determine the
percentage of water absorbed by raisins'. They are not in proper
sequence.
r. Soak the raisins in fresh water.
II. Weigp dry raisins.
III. Weigh soaked raisins.
IV. Wipe out soaked raisins.
The correct sequence of steps is 1
(A) I, II, III, IV
(B) II, I, IV, III
(C) II, I, III, IV
(D) I, II, IV, III
TCfj~lfiJ~1~ .c;Rf wr ~ ~ CflT ~ m cnG' ~ m -ij ~ ~ RlO1if<.'1f{9(1
~, ~ ~ ~ sm clq) ~ ~ I
I. fctJ~lfiJ~1~ c;Rf q;) ~ -qRf ~ ~ I
II. ~ fctJ~lfiJ~1 ~ ~ q;) ~ I
III. '4rT. FCfj~lfiJ~1~ c;Rf q;) ~ I
IV. '4rT FCfj~lfiJ~1~ c;Rf q;) W I
~CflT~sm~
31/1 16
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For more previous year question papers visit :
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For more previous year question papers visit :
www.4ono.com
For more previous year question papers visit : www.4ono.com
• 15 minutes time has been allotted. to read this question paper. The question
paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the
students will read the question paper only and will not write any answer
on the answer script during this period.
• rpr:rr ~ CR ~ fCfi ~ ~--q;r if ~ ~ 16 % I
SUMMATIVE ASSESSMENT - II
~ tRt8;lT - II
SCIENCE
~
Time allowed : 3 hours Maximum Marks: 80
f.:rt:Tfmr m:3 EfUZ 31f~*: 80
31/1 1 P.T.D.
General Instructions :
(i) The question paper comprises of two sections, A and B. You are to
attempt both the sections.
(ii) All questions are compulsory.
(iii) There is no overall choice. However, internal choice has been
provided in all the three questions of five marks category. Only one
option in such questions is to be attempted.
(iv) All questions of Section A and all questions of Section B are to be
attempted separately.
(v) Questions number 1 to 4 in Section A are one mark questions.
These are to be answered in one word or one sentence.
(vi) Questions number 5 to 13 in Section A are two mark questions.
These are to be answered in about 30 words each.
(vii) Questions number 14 to 22 in Section A are three mark questions.
These are to be answered in about 50 words each.
(viii) Questions number 23 to 25 in Section A are five mark questions.
These are to be answered in about 70 words each.
(ix) Questions number 26 to 41 in Section B are multiple choice
questions based on practical skills. Each question is a one mark
question. You are to select one most appropriate response out of the
four provided to you.
flllIJ"4 ~ :
(i) ~ J{R W q;J- rfr ~ 'J1T7T 3T 3ft;: 'J1T7T ~ -q ~ 7J7JT ~ I 3flTTCiiT qJ;ff ri
it m= it dnl: fffisl;f ~ I
(ii) ~ J{R 31f.:rqp;f ~ I
(iii) 9! J{R W TN q;Jf 'f/7R JITCff "#f ~ rp:;g qfq-qfq. ajq?f .it ffR m= -q J{R
#trrtt 'f/7R kl1T 7J7JT ~ I F m= -q 3TfTl item" J{R #trrtt 1J!Ji 'f/7R q;J- dnl:
fffisl;f it fffi!: ¥ -m ~ I
(iv) 3flTTCiiT 'J1T7T 3T 3ft;: 'J1T7T q it ~ m= it dnl: Y2fc!f-~ 'J1T7T ~ TN fffisl;f m I
30-30 ~ -q ~ ~ I
(v ii) 'J1T7T 3T it J{R if&:rT 14 if 22 it J{R ffR- ffR ajq?f it ~ I ~ dnl: "WTo/T
50-50 ~ -q ~ ~ I
(viii) 'J1T7T 3T it J{R if&:rT 23 if 25 it J{R qfq-qfq ajq?f it ~ I ~ dnl: "WTo/T
70 ~ -q ~ ~ I
(ix) 'J1T7T q it J{R if&:rT 26 if 41 it J{R >l4JJ/1I4Cfl ~TN ~ ~gmCflflil
J{R ~ I ~ J{R lJ:C/i 3i$ q;r ~ I f0: 7fit rm: mCflc4r -q if .irft:rcit item" lJ:C/i
w:r# ~ fcrq;c;q" ~ ~ I .
31/1 2
SECTION A
~31
5. How does the valency of elements vary (i) in going down a group, and
(ii) in going from left to right in a period of the periodic table ? 2
~ ~ -q mqT q,1 B41\JiCf)dl -q ~ qf{Cld" irnr ~,
(i) fcfiBt qrf -q ~ .-B ~ ~ -q ?
(ii) fcfiBt ~ -q ~ -B ~ ~ -q ?
31/1 3 p.T.a.
9. Expl~in with the help of a diagram, how we are able to observe the
sunrise about two minutes before the sun gets above the horizon.
~ ~ ~ ~ ~ fcIi Ql1 ~ >rcl1T\ ~ cn1 CJl«fCl if ~ il; ~ -B
~rnil;cJfiRz~m~~~ I
10. List any, four reasons for vegetative propagation being practised in the
growth of some type of plants. '
'¥9 >rcl1T\ il; ~ il; q~ if ~ (vegetative) W.f~ ~ ~ il; coW ~ Cfif{UT
~I
11. Describe the role of fallopian tubes in the female reproductive system.
11TGf ~ ('P:f if q;<11RFH-~3TI Ch1 ~ cpr cruR ~ I
12. List any four disadvantages of using fossil fuels for the production of
energy.
~ ~ il; fC;m: \jjlql~41 ~~ il; m Ch1cnW ~ ~ ~
31/1 4
15. The atomic number of an element'is 16. Predict
(i) the number of valence electrons in its atom
(ii) its valency
(iii) its group number
(iv) whether it is a metal or a non-metal
(v) the nature of oxide formed by it
(vi) the formula of its chloride 3
~ cnq CflT 'WiTUJ ~ 16 ~ I ~ ~ if ~ ~
(i) ~ W1TUJ if B~I'JjChdl ~c'1~T.{jCh1 ~
(ii) ~ Blil'JjChdl
16. An object is placed between infinity and the pole of a convex mirror.
Draw a ray diagram and also state the position, the relative size and
.the nature. of the image formed. 3
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~ -rnT ~ ~ 5lRifdl~ ~ fu"Q: ~ fq;r ~ 31R 5lrdfdl~ ~ ~ if ~
- ~ ~) ~ ~ ~ 31R ~ ~ I
17. What is the principle of reversibility of light? Show that the incident
ray of light is parallel to the emergent ray of light 'Yhen light falls
obliquely on a side of a rectangular glass slab. 3
>[q)ffi Ch1 3ffilliOnlJdJ (reversibility) CflT ~ cp:rr ~ ? ~ fcfi ~ >[q)ffi ~
fcfBr 31llJdIChI{ rilf ~ ~~ m1 11\ ~ ~ mm~ "ill ~>[q)ffi-~
f.:rfu >[q)ffi ~ ~ flli HH '?rill ~ I .
18. What eye defect is myopia ? Describe with a neat diagram how this
defect of vision can be corrected by using a suitable lens. 3
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~ tB ~ ~ ~~ CflT f.:1 q I{O I fcfi<:rr ~ 'W;fi'ill ~ J
19. What does HIV stand for? Is AIDS an infectious disease? List any
four modes of spreading AIDS. 3
HIV cp:rr ~e, CRffi ~ ? Cf<IT AIDS ~ B~lliCh WI ~ ? AIDS ~ ~. Ch1 q;){
31/1 5 P.T.D.
••
20. Describe any three ways in which individuals with· a particular trait
may increase in population. 3
~ <fR ~ fclf~ CflT crrR ~ ~ M fcmcr :rrr (fcl ~l tlCfl) ~ oqfu) arq-;ft
~ett-m~m~ I
21. State the evidence we have for the origin of life from inanimate matter. 3
~ ~ ~ ~ QW-'q. ~ ill ~ W1TUT CflT ~ ~ I
22. What are fossils? What do they tell us about the process of evolution? 3
~lql~!Ol q:<:JT~ ~ ? ~ mm ~ ill ~ -B ~ q:<:JT~ ~ ?
23. (a) State two properties of carbon which lead to a very large number
of carbon compounds.
(b) Why does micelle formation take place when soap is added to
water? Why are micelles not formed when soap is added to
ethanol? 5
OR
(C4HlO)
ill m
B!Ollqllqdl ett ~
B!Ollqllfcl'4"j
~',
'ett ~
B!Ollqllfcl'4l
~ ~
ett ~
I
-:qr: fcl~ltldl~ ~ I ~
31/1 6
(a) Draw a ray diagram to show the formation of image of an object
placed between infinity and the optical centre of a concave lens.
(b) A concave lens of focal length 15 em forms an image 10 em from
the lens.
Calculate
(i) the distance of the object from the lens
(ii) the magnification for the image formed
(iii) the nature of the image formed 5
(en) (~ cn1 ~ ("CfICR)' -B CFIT ~ ~ ~ ?
3l~
~if;~~~m~ I
~ I
qRCf)f~d ~
(i) ~ -B ~q,1 ~
(ii) mtd" 5IfCif&tkl if; ~ ~
25. With the help of suitable diagrams, explain the varIOUS steps of
budding in Hydra. 5
OR
What is binary fission in organisms ? With the help of suitable
?iagrams, describe the mode of reproduction in Amoeba. 5
.~ ~ q,1 flQI?1dl -B ~ (Hydra) if; ~ (Cf)(1?1I'iI) if; ~ TRUTf cn1 ~
~I '
3l~
~ if fu-~ (binary fission) fW:rr CFIT ~ ~ ? ~ ~ cn1 fltil?1dl -B ~
if ~ ~ CfiT quf.:r ~ I
31/1 7 p.T.a.
SECTION B
'iWT 6f
26. To find the focal length of a concave mirror, Sita should choose which
one of the following set-ups ? 1
(A) A mirror holder and a screen holder
(B) A screen holder and a scale
(C) A mirror holder, a screen holder and a scale
(D) A screen, a mirror, holders for them and a scale
~ QPTT ?
(A) ~ ~ m 3fu:~ W m
(B) ~ ~m3fu:
'1~1 . ~ ~
(C) ~ ~ m, ~ w m 3fu:~ ~
(D) ~ W, ~.~, ~ Wm: m 3fu:~ ~
27. By using a convex lens, a student obtained a sharp image of his
class-room window grill on a screen. In which direction should he move
the lens to focus a distant tree instead of the grill ? 1
(A) Towards the screen
(B) Away from the screen
(C) Very far away from the screen
(D) Behind the screen
(A) ~ ett 3W
(B) ~ ~ ~
(C) ~ ~ ~ ~
(D) ~ ~ -qm
31/1 8
28. To determine the focal length of a convex lens by obtaining a sharp
image of a distant object, the following steps were suggested which are
not in proper sequence :
I. Hold the lens between the object and the screen.
II. Adjust the position of the lens to form a sharp image.
III. Select a suitable distant object.
IV. Measure the distance between the lens and the screen.
The correct sequence of steps to determine the focal length of the
lens is 1
29. In these diagrams, the angle of refraction r has been correctly marked
in which diagram ? 1
I II III IV
(A) I (B) II
(C) III (D) IV
31/1 9 p.T.a.
I II III IV
(A) I (B) II
(C) III (D) IV
,.
the lateral displacement was correctly measured as 1
(A) AB (B) PQ
(C) CD (D) PR
::: I"
(C) CD (D) PR
31/1 10
31. Iron nails were dipped in an aqueous solution of copper sulphate. After
about 30 minutes, it. was observed that the colour of the solution
changed from 1
(A) colourless to light green.
(B) blue to light green.
(C) blue to colourless.
(D) green to blue.
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(D) m amQ(jfl1f.111~ ~ ~ ~ I
31/1 11 p.T.a.
••
33. Vapours of acetic acid smell
1
(A) pungent like vinegar.
(A) ~ ~ cmm I
(B) ~ ~ mcft I
(D) ~~~ I
~mt-mt
(A) m-r~-B- -rtB
mt-mtcfurm
m-r ~ Th:r~I~~I.
'1~1~1~2:
1~~1~2:
m-r -I m 12
(D)
(B)
31/1
35. A student added acetic acid to test tubes I, II, III and IV containing
the labelled substances and then brought a burning splinter near the
mouth of each test tube.
II III IV
(A) I
(B) II
(G) III
(D) IV
I II III IV
(B) II
(C) III
(D) IV
31/1 13 P.T.O.
36. The shape of yeast cell is 1
(A) only spherical.
(B) only oval.
(C) irregular.
(D) both oval and spherical.
~-(~) ~ ~ 3Wfifu m-ffi ~
(A) ~ JTh.'1ICflI\I
(B) ~~I
37. The steps involved in observing a slide under a microscope are given
below. They are not in proper sequence.
I. Focus the object under high power of the microscope.
II. Place the slide on the stage of the microscope.
III. Arrange the mirror to reflect maximum light to the slide.
IV. Focus the object under low power of the microscope.
The proper sequence of steps is 1
(A) II, III, IV, I
(B) I, II, III, IV
(C) IV, III, II, I
(D) III, I, II, IV
~ ~ q;) ~ if ~ ~ TRITT ~ fu'@ %, ~ ~ 9011 .~ ~ ~
II. ~q;)~~mr'R~ I
III. GLfuT ~ q;) f.i<1f~d ~ ~ 'R ~~ >rcIim ~ I
~"itT~~~
(A) II, III, IV; I ••••. 1
; t·
(D) III, I, II, IV
31/1 14
D"- - ...•.••~ _
38. Theillustrate
.given
binary
figuresIIfission
IIIIV in in improper
Aunoeba
(~
~~
G]8
The correct order is 1
(1\) III, IV, II, I
(B) IV, III, II, I
(C) II, III, IV, I
(I)) I, III, IV, II
ctt Tf{ 3i11lRp"i1 if ~ ~ fu-~ CfiT ~ w:r ~ 1"fCTI ~
GJ8~~~
I II III IV
~w:rQTrrr
(1\) III, IV;II, I
(B) IV,III, II, I
(C) II, III, IV, I
(I)) I, III, IV;II
(C) m 1U m ~ -qi ~ ~ ~ I
(I)) ~ ~, ~ ~ ~ 3th: cfR m (fq) ~ ~ ~ I
31/1 15 P.T.D.
40. The colour of raisins as used in the experiment, 'to determine the
percentage of water absorbed by raisins' was 1
(A) white
(B) yellow
(C) dark brown
(D) pink
TCj)~lf~~1 ~ ~ wr ~ ~ CflT ~ m cnG' ~ m -ij ~ fctJ~lfiJ~1~ ~
CflT ~ mm ~
(A) ~
(B) 1fu;rr
(C) ~ ~ \
(D) ~ {
41. Following are the steps iI).volvedin the experiment 'to determine the
percentage of water absorbed by raisins'. They are not in proper
sequence.
r. Soak the raisins in fresh water.
II. Weigp dry raisins.
III. Weigh soaked raisins.
IV. Wipe out soaked raisins.
The correct sequence of steps is 1
(A) I, II, III, IV
(B) II, I, IV, III
(C) II, I, III, IV
(D) I, II, IV, III
TCfj~lfiJ~1~ .c;Rf wr ~ ~ CflT ~ m cnG' ~ m -ij ~ ~ RlO1if<.'1f{9(1
~, ~ ~ ~ sm clq) ~ ~ I
I. fctJ~lfiJ~1~ c;Rf q;) ~ -qRf ~ ~ I
II. ~ fctJ~lfiJ~1 ~ ~ q;) ~ I
III. '4rT. FCfj~lfiJ~1~ c;Rf q;) ~ I
IV. '4rT FCfj~lfiJ~1~ c;Rf q;) W I
~CflT~sm~
31/1 16
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