S.S.C.

PUBLIC EXAMINATIONS
2022 - PHYSICAL SCIENCE

DISTRICT COMMON EXAMINATION BOARD

VIZIANAGARAM
 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

DCEB Board
Sri.P.Bhrahmaji Rao,
DEO &Chairman, DCEB, Vizianagaram
Sri.T. Sanyasiraju,
Secretary, DCEB, Vizianagaram
Sri.V. Rajesh, Subject Expert, Primary DCEB, Vizianagaram

Prepared by:

1. Sri P.Raghava Kumar, S.A.(Phy. Sci)

Z.P.H. S.,Pedavemali, Gantyada Mandal

2. Sri S.RamakrishnaS.A.(Phy. Sci)

Z.P.H.S., Konuru, Garividi Mandal

3. Sri Ch. Phaneedra, S.A.(Phy. Sci)

Z.P.H. S., Jonnada, Denka Mandal

4. Sri M.Appala Naidu, S.A.(Phy. Sci)

Z.P.H. S, Kondavelagada, Nellimarla Mandal

5. Sri T.Rajesh, S.A.(Phy. Sci)

Z.P.H. S., Jarajapupeta, Nellimarla Mandal

6. Sri K.Ramesh Kumar S.A.(Phy. Sci)

Z.P.H. S., Merakamudidam Mandal

7. Sri Y.Nanajee, S.A.(Phy. Sci)

Z.P.H.S., Pedathadivada, Denkada Mandal

8. Sri A.Naresh S.A.(Phy. Sci)

Z.P.H. S., Kotyada

9. Sri S.Shariff, S.A.(Phy. Sci)

Z.P.H. S., Kottakki

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

INDEX

1. Guidelines to teachers and students Page 3

2. Deleted syllabus for the Academic years 2021-22 Page 4
3. Model Papers released by AP SCERT 5-9
4. Heat 10-12
5. Acids, Bases and Salts 13-14
6. Refraction of Light at Plane Surfaces 15-17
7. Refraction of Light at Curved Surfaces 18-20
8. Human Eye and Colourful World 21-23
9. Structure of Atom 24-26
10.Classification of Elements – The Periodic Table 27-30
11. Chemical Bonding 31-32
12.Electric Current 33-35
13.Principles of Metallurgy 36-37

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Assignment conduct

*
*

Quiz

Model Paper-1 1,2,3,4,6

Model Paper-2 5,7,8,9, 11

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Deleted syllabus for the Academic years 2021-22

1. Electromagnetism

2. Carbon and its compounds

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

SSC PUBLIC EXAMINATIONS - 2022

GENERAL SCIENCE - PAPER - I (English Version)
Class : X Max.Marks : 50 Time : 2hrs.45min.

Instructions :
1. 15 minutes of time is allotted for reading the question paper in addition to 2.30 hours for
writing the answers.
2. All the answers should be written in the separate answer booklet.
3. There are four sections in the question paper.
4. There is internal choice in Section IV.
5. Write all the question visible & legible
SECTION - I 12 × ½ = 6 M
Note:
1. Answer all the questions.
2. Each question carries ½ mark
1. .................... is defined as the degree of hotness or coldness.
2. Latent heat of vapourisation of water is ................... ( )
A) 500 cal/gm B) 540 cal/gm C) 80 K cal/gm D) 500 K cal/gm
3. Imagine and write which gas will be evolved generally when a metal reacts with an acid.
4. A : Aqueous sodium Chloride is called as brain solution ( )
B : Mg(OH)2 is alkali solution (Alkali)
K) Only A is true L) Only B is true
M) Both A and B are true N) Both A and B false
5. Write any one use of a lens in our daily life ?
6. Lens Shape

1. Biconvex lens ( ) p)

2. Biconcave lens ( ) q)

r)
Match the above
A) 1 - p, 2 - q B) 1 - q, 2 - p C) 1 - q, 2 - r D) 1 - r, 2 - p
7. Which is the colored part that we see in our eye ?
8. Which of the following is the Planck’s constant.
A) 6.626×10-34 JS B) 6.626×10-34 J/S C) 6.626×10-27 JS D) 6.626×10-27 J/S
9. When asked Swarup to give examples for Halogens, he stated as florin, chlorine, neon,
bromine. By observing the examples given by Swarup find and write which element is not
a halogen among them.
10. According octate rule ‘Argan’ demonstrates stability, assume and write how many electrons
are there in it’s outer most orbit.
11. What is the SI unit of “Potential difference”.
12. Write name of any metal that is helpful in our daily life.

SECTION - II 8 × 1 = 8 M
Note:
1. Answer all the questions.
2. Each question carries 1 mark.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

13. A is less optically denser than B. Keeping in view of optical densities re write and complete
the diagram in your answer sheet.
14. Write any two required material to determine the focal length of a lens using UV method in
laboratory?
15. What is least distance of distinct vision of a healthy humans ?

16. An electron in an atoms has the following set of four quantum numbers.
On bases above table
To which orbital electron belongs.
17. Give any one example for Dobereiner’s Triods.
18. Write any other name of ‘Ionic Bond’.
19. What do you call a character of Electric conductor that opposes the motion of electron.
20. Write any two highly reactive metals you know.

SECTION – III 8 × 2 = 16 M
Note:
1. Answer all the questions.
2. Each question carries 2 marks.
21. Assume and write why do we have Sweat while doing work.
22. Let A, B, C material have given red, yellow, red colors when react with methyl orange
respectively.
1) Among A, B, C which are acids, which are bases.
2) What is the change in colour when phenolphthalein add to be.
23. Write any two required material to do the activity to say that ‘the focal length of a lens
depends on it’s surroundings’ and also write any one precaution to do this activity.
24. Doctor suggested to use 4D lens. What is the focal length of the lens?
25. Explain what is method briefly.
26. What is the bond angle of the following.
1) Angle of in water molecule
2) Angle of in Ammonia
27. Explain what happend to the value of resistance of a conductor if it’s cross sectional area is
doubled and length is kept under constant.
28. Write any two questions to understand how the metals extracted from their ore ?

SECTION - IV 5 × 4 = 20 M
Note:
1. Write answer for all all the questions.
2. There is an internal choice for each question.
3. All question cames equal marks.
4. Each question caries 4 marks.
29. Write the appropriate reasons for the following phenomenon.
a) Water melon brought out forme refrigerator retains its coolness for a longer time than
any other fruits.
b) Oceans behave like heat store houses for the earth.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

(OR)
What is myopia ? How do we can rectify it?
30.

By observing the above table answer the following in A, B, C, D, E, F solutions.

1) Which is strongest Acid
2) Which is weak acid
3) Which is strong Base
4) Which is neutral
(OR)
Classify the following in to oxides, sulfides, sulfates separately.

31. Write the lab activity to obtain a relations between angle of incidence and angle of
refraction(Snell’s law)
(OR)
Write the lab activity to show that the ratio V/I (Ohm’s law) is a constant for a conduct.
32. How the following periodic properties of matter trend in groups and periods.
A) Ionisation Energy
B) Electronegativity
C) Atomic radius
D) Electron affinity
(OR)
A, B and C are there elements which atomic numbers 6, 11 and 17 respectively then
1) Which of these can’t form ionic bond ? Why ?
2) Which of these can’t form covalent bond ? why ?
33. If an object kept before a convex lens then draw the ray diagrams to the following positions
of object.
1) At 2F2
2) Beyond 2F2
(OR)
Draw a neat diagram the filling order of atomic orbitals by electrons (Moeller chart).

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

SCERT MODEL PAPER - 1

S.S.C. PUBLIC EXAMINATIONS-2021
PHYSICAL SCIENCE
(English Medium)
Class : X (Max. Marks : 50) Time : 2hr.45min.

Instructions :
1. There are four sections an 33 questions in this paper
2. Answer should be written in a given answer booklet
3. There is internal choice in Section - IV
4. Write all the questions visible and legibly
5. 15 Minutes are given for reading the question paper and 2.30 hours for
given for answering questions.

Section – I
Note : 1. Answer all the Questions.
2. Each Question carries ½ mark 12 X ½= 6
1. What is the shape of V-I graph of Ohmic conductor?
2. S-I unit of heat is __________________
3. The colour of pheolphthalein indicator in baric solution is ___________
A) Yellow B) Green C) Pink D) Orange
4. X : Refractive index n=c/v
Y : Refractive index has no units
A) Both are correct B) X is correct,Y is wrong
C) X is wrong, Y is wrong D) Both are wrong
5. Which electronic shell is at a higher energy level K or L?
6. Lithium ______ and potassium constitute a dobereiners triad.
7. Match the suitable answers of section-B with section-A
Section-A Section-B
x) N2 P) 1200
y) BF3 Q) 1800
R) 3 bonds
8. The impurity present in the ore is called as ________
A) Gangue B) Flux C) Slag D) Mineral
9. What is the maxium focal length of the human eye lens?
10. The midpoint of a thin lens is called ________
A) Centre of curvature B) Optic Centre C) Focus D) Radius of curvature
11. Write the name of simplest hydrocarbon
12. Weber/meter2 =
A)Oersted B) Tesla C) Newton D) Watt
Section - II
Note : 1. Answer all the Questions.
2. Each Question carries 1 Mark 8×1=8
13. Which rule is violated in the electric configuration ?
14. What is the flux through the plane taken parallel to the field?
15. Mention any one of methods of prevention of corrosion.
16. Write the formula of specific heat
17. What is refraction?
18. What are factors which affect the resistance of a material?
19. What is shape of BF3?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

20. Define the modern periodic law.

Section - III
Note : 1. Answer all the Questions.
2. Each Question carries 2 Marks 8 × 2 = 16
21. What role does specific heat play in keeping a watermelon cool for a long
time after removing at from a fridge on a hot day?
22. Why does not distilled water conduct electricity?
23. Frame any two questions to understand difference between convex lens and
concave lens.
24. Write the materials required to conduct Oersted experiment.
25. Define power of lens and write their unit
26. Write the four quantum numbers for 1s1 electron.
27. When we sit at camp fire, objects beyond the fire are seen swaying. Give
reason for it.
28. Define " mineral".
Section - IV
Note : 1. Answer all the Questions.
2. Each Question carries 4 Marks 5 × 4 = 20
29. How do you correct the eye defect Myopia?
OR
Define the following terms
A) Electric current B) Resistance
30. Discuss the construction of the long form of the periodic table
OR
Explain the formation of BeCl2 molecule using hybridisation.
31. Explain the procedure of finding specific heat of solids experimentally
OR
How do you verify experimentally that Sin i / Sin r is a constant?
32. Complete the following table

OR
Observe the table and answer the following questions.

a) What is the general formula of Alkanes?

b) Write the moleular formula of next alkane comes after Butane.
c) How many carbons in Pentane?
d) How many bonds present in Methane?
33. Draw ray diagrams for the following positions of convex lens?
A) Object is placed at F2 B) Object is placed at 2F2
OR
Draw the shape of s and p orbitals.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -1 HEAT
½ Mark Questions:
1. ___________ is defined as the degree of hotness of coldness (temperature)
2. Latent heat of vaporization of water is _________ [ A ]
A. 540 Cal/gm B) 80 cal/gm C) 540 kilo cal/gm D) 80 kilo cal/gm
3. The S.I. unit of heat is _________ (Joule)
4. 1 cal = ___________ Joules (4.186)
5. Specific heat S = __________ [ C ]
A. B) C) D)
°
6. The boiling point of water is = __________ (100 C)
7. The process of escaping of molecules from the surface of liquid at any temperature is
called __________ (Evaporation)
8. ___________ is a surface phenomenon. (Evaporation)
9. Three bodies A, B and C are in thermal equilibrium. The temperature of B is 45°C, then
the temperature of C is __________ [ A ]
A. 45°C B) 50°C C) 40°C D) any temperature
10. Match the following [ A ]
a) Wet clothes dry ( ) P) warming process
b) Droplets on cool drink bottle ( ) Q) cooling process
R) oxidization process
A. a-Q, b-P B) a-P, b-Q C) a-P, b-R D) a-Q, b-R
11. Which of the following has high specific heat? [ C ]
A. Ice B) Lead C) Water D) Kerosene
12. The temperature at which ice changes into water [ D ]
A. 0°C B) 273K C) 100°C D) A and B
13. From the given figure
in which thermometer (A or B)
Mercury level increases.

14. What is humidity?

Ans: The amount of water vapour present in air is called humidity.
15. The doctor checked the body temperature of a 10th class student and said his body
temperature is 310K. The body temperature of that boy in Celsius scale is ___ (37°C)

1 Mark Questions:
1. Convert 25°C into Kelvin Scale.
Ans: 25°C = ( 25 + 273) K = 298K
2. What happens to the water when wet clothes dry?
Ans: Water present in clothes evaporates.
3. Why does ice floats on water?
Ans: the density of ice is less than that of water.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

4. Why water is used as coolant?

Ans: Water has greater specific heat.
5. A Samosa appears to be cool when touched outside but it is hot when we eat it. Why?
Ans: Because the curry inside the samosa contains ingredients with higher specific heat.
Hence they remain hot for a long time.
6. Why do we sweat while doing work?
Ans: When we do work, our body produces heat. As a result the temperature of skin
become higher and the water in the sweat glands starts evaporating.
7. Define fog?
Ans: Fog is thick cloud that remains suspended in the atmosphere at near the surface of the
earth that restricts visibility.
8. Define latent heat of fusion.
Ans: the amount of heat energy required to convert 1 unit mass of a solid liquid at a
constant temperature is called latent heat of fusion.

2 Marks Questions:
1. Write the differences between temperature and heat?
2. Write the differences between evaporation and boiling?
3. Explain why dogs pant during hot summer using the concept of evaporation?
4. Why do we get dew in the surface of a cold soft drink bottle kept in open air?
5. If you are chill outside the shower stall, why do you feel warm after the bath if you stay
in bathroom?
6. Three objects A,B and C are in thermal equilibrium. If the temperature of the A is 300°C
then what is the temperature of C? What is the amount heat transfer takes place from A
to B?
7. How do you appreciate the rate of higher specific heat of water in stabilizing
atmospheric temperature during winter and summer seasons?

4 Marks Questions:
1. Write the appropriate reasons for the following phenomenon.
a) Watermelon brought out from the refrigerator retains its coolness for a longer time
than any other fruits.
b) Oceans behave like heat storehouses for the earth.
2. Answer the following questions by using the data given in the table.

Substance Specific heat ( cal/gm-°C)

Copper 0.095
Iron 0.115
Aluminium 0.21
Water 1.00
a) Write the SI units of Specific heat?
b) Which substance used as bottom of the cooking vessels? Why?
c) What is the amount of heat required to raise the temperature of 1gm of water
through 1°C?
d) Depending on the above table what are the factors effecting the specific heat?

3. Explain the procedure of finding specific heat of solid/lead shots experimentally?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

4. Temperature of two cities at different times are given as follows

Time City At 6 AM At 11.30 AM At 6 PM

A -3°C 300K 5°C
B 271K 27°C 270k
On the basis of above table, answer the following questions.
1. In which city, the morning temperature at 6o’Clock is relatively high?
2. At which time, both cities are having the equal temperature?

5. Write the factors that affect the process of evaporation. Explain with suitable examples.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -2 ACIDS, BASES AND SALTS

½ Mark Questions:
1. The colour of Phenolphthalein indicator in basic solution is ___________ [ C ]
A. Yellow B) green C) pink D) orange
2. Which gas evolves when Acids reacts with metals? (Hydrogen gas)
3. Matching [ B]
1) <7 P) Basic solution
2) >7 Q) Acidic solution
3) =7 R) Neutral solution
A. 1-P, 2-Q, 3-R B) 1-Q, 2-P, 3-R C) 1-Q, 2-R, 3-P D) 1-P, 2-R, 3-Q
4. When do we call a rain as acid rain with respect to its value?
Ans: When value is less than 5.6
5. What happens when the of mouth is less than 5.5?
Ans: tooth decay starts
6. Which substance doctor use for supporting fractured bones in the right position?
Ans: Plaster of paris ( )
7. Matching [ D]
1. Strong acid a)
2. Weak acid b) HCl
c) CH3COOH
A)1-a, 2-b B) 1-a, 2-c C) 1-c, 2-a D) 1-b, 2-c

8. Matching [ C]
1. Plaster of paris a)
2. Washing soda b)
c)
A)1-a, 2-b B) 1-b, 2-a C) 1-c, 2-a D) 1-a, 2-c
9. Which gas makes a pop sound when it exposed to a burning splinter?
Ans: Hydrogen gas
10. A: Aqueous sodium chloride is called brine solution [ M]
B: Mg(OH)2 is an alkalis solution
K) only A is true L) Only B is true
M) Both A and B are true N) Both A and B are false
11. Which of the following substance is a strong base? [ D]
A. =7 B) =8 C) =0 D) =14
12. Complete the following equation (Ans: Base)
Acid + ______ Salt + water

13. Vani: Water is added to an acid

Rani: Acid is added to water
A) Vani and Rani are correct B) Vani correct and Rani wrong
C) Vani wrong and Rani correct D) Vani and Rani both are wrong
Ans: C

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

14. Match the following [ B]

1. Lemon P) Tartaric acid
2. Ants Q) Citric acid
R) Formic acid
A) 1-P, 2-Q B) 1-Q, 2-R C) 1-R, 2-P D) 1-Q, 2-P
1 Mark Questions:
1. What is neutralization reaction? Give an example.
2. What happens if the value of gastric juice in our body increases?
3. Name of the base present in antacid tablets?
4. Why does not distilled water conduct electricity?
5. What are olfactory indicators? Give one example.
6. Why pure acetic acid does not turn blue litmus to red?
7. Why pickles and sour substances are not stored in brass and copper vessels?
2 Marks Questions:
1. What is baking powder? How does it make the cake soft and spongy?
2. Write any two uses of bleaching powder?
3. Plaster of paris should be stored in moisture proof container. Explain.
4. Give two important uses of washing soda and baking soda?
5. What importance of in our digestive system?
6. Fresh milk has of 6. How does the change as it turns to curd. Explain.
7. Write any two uses of bleaching powder?
8. What is the importance of of the soil?
4 Marks Questions:
1. Compounds such as alcohols and glucose contain hydrogen but are not categorized as
acids. Describe an activity to prove it?
2. How do metal react with acids? Explain with an experiment?
3. How do metal react with bases? Explain with an experiment?
4. A milkman adds a very small amount of baking soda to fresh milk.
a) Why does he shift of the fresh milk from 6 to slightly alkaline?
b) Why does this milk take a long time to set as curd?
5. How do metal carbonates react with acids? Explain with an experiment?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -3 REFRACTION OF LIGHT AT PLANE SURFACES

½ Mark Questions:
1. Why do stars appear twinkling? (light refraction)
2. The S.I. units of refractive index ( No units)
3. Which property is not change due to in refraction? (frequency)
4. Velocity of light in vacuum is m/s. Velocity of light in a X-material is m/s.
So the refractive index of the X-material is __________. (1.5)
5. Suppose you are inside a swimming pool near an edge. Your friend is standing on the
other edge. Do you find your friend is taller or shorter? ( looks taller)
6. X: Refractive index of a medium depends on nature of substance. (X,Y both are true)
Y: Refractive index of a medium depends on wavelength of light
A) X,Y both are true B) X –true, Y-false
C) X –false, Y-true D) X, Y both are false
7. The refractive index is at critical angle of 450 is ________ (1.414)

8. Identify the Snell’s law [ D ]

A. B) = C) D) Above all
9. The value of Refractive angle for a critical angle is ___________ ( 900 )
10. What is the cause for mirages? (Total internal reflection)
11. What is the reason behind the shining of diamonds? (Total internal reflection)
12. The critical angle of diamond is ____________ ( 24.40 )
13. What is the principle behind in working of optical fibre? (Total internal reflection)
14. What is the critical angle of water? ( 48.5°or 48.75°)
15. Write the formula for critical angle? ( )
16. Matching ( Ans:1-d, 2-b )
Substance Refractive index
1. Air a) 2.42
2. Glass b) 1.50
c) 1.33
d) 1.00

17. In which substance light has more speed? ( Ice )

Substance Refractive index
1. Crown glass a) 1.52
2. Ruby b) 1.71
3. Ice c) 1.31
4. Sapphire d) 1.77
18. Radius of optical fibre is ____________ ( )
19. The angle of deviation produced by the glass slab is _________ ( 0° )
20. Total internal reflection takes place when a light ray travel from __________ to
________ medium ( denser, rarer )

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

1 Mark Questions:
1. Refractive index of glass relative to water is . What is the refractive index of water
relative to glass?
2. What apparatus are required to obtain a relation between angle of incidence and angle
of refraction?
3. Define refraction?
4. On what factors does the refractive index of a medium depend?
5. Why it is difficult to shoot a fish swimming in water?
6. State Snell’s law?
7. When we sit at a camp fire, objects beyond the fire are seen swaying. Give reason for it.
8. Why does light bend when it passes from one medium to another medium?
9. When dos the Snell’s law not obey?
10. What happens to the light ray when angle of incidence is greater than the critical angle?
2 Marks Questions:
1. Why it is difficult to shoot a fish swimming in water?
2. Why does a diamond shine more than a glass cut to the same shape?
3. How do you appreciate the role of Fermat principle in drawing ray diagrams?
4. Determine the refractive index of benzene if the critical angle is 42°?
5. When we sit at a camp fire, objects beyond the fire are seen swaying. Give reason for it.
6. What are the conditions for total internal reflection?
7. Draw the ray diagram when light ray travels from kerosene to water.
8. From the ray diagram, calculate Air(rarer)
(i) Critical angle
(ii) Refractive index of the medium and 45° denser
medium
(iii) Speed of light in the medium.

9. Your friend is confusing to understand the concept of mirage formation. Ask him some
questions to clarify his confusion.
10. What are the laws of refraction?
11. In what cases does a light ray not deviate at interface of two media? (or) Write the case
at which angle of incidence is equal to angle of refraction.
4 Marks Questions:
1. What is a mirage? Explain the formation of mirage? (or) Explain the principle involved in
mirage formation.
2. How do you verify experimentally that is a constant? (or) Which law obeys
at refraction, verify it experimentally.
3. Explain total internal reflection with an activity?
4. Explain an activity to understand critical angle in refraction of light.
5. How do you verify experimentally that the angle of refraction is more than angle of
incidence when light rays travel from denser to rarer medium.
6. Explain the working of optical fibres? What is the importance of optical fibres in day to
day life?
7. Refractive indices of material media are given in the table
Material Rock Crown
Air Water Kerosene Benzene Diamond
medium salt glass
Refractive
1.0003 1.33 1.44 1.54 1.50 2.42 1.50
index

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S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Answer the following questions from above data

(i) What happens to light ray when it travels from water to kerosene?
(ii) Do you observe total internal reflection when light travels from Benzene to water?
(iii) Arrange the following material media in ascending order as per the speed of light in them.
Water, kerosene, benzene and air
(iv) What are the S.I. units of refractive index?
(v) From the above table in which material medium speed of light is maximum?
(vi) Calculate speed of light in Benzene.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -4 REFRACTION OF LIGHT AT CURVED SURFACES

½ Mark Questions:
1. On what factors does focal length of lens depend?
Ans: (1) Nature of material (2) Nature of surrounding medium (3) Wavelength of incident
light
2. Which lens is used in microscope? ( Convex )
3. Can you photograph a virtual image? (yes)
4. What are called the rays parallel near to the principal axis? ( paraxial rays )
5. Write lens makers formula? ( )
6. Lens focal length
A +20 cm
B -15 cm
Identify the convex lens from above table ( Ans: A)
7. Lens Power
A 1D
B 2D
C 3D
D 4D
Which is high focal length of the above? ( Ans: A)
8. What is principal axis? (The line which joins the two centre of curvatures)
9. Which one of the following material cannot be used to make a lens? ( Ans: D)
A. Water B) glass C) plastic D) clay
10. What is lens formula? ( )
11. The distance between focal point to optic centre is called________ ( focal length)
12. The relation between focal length (f) and radius of curvature (R) of a lens is____ ( R=2f )
13. The ray passing through the ______ of the lens is not deviated ( optic centre )
14. Identify the biconvex lens from the given diagrams. ( Ans: A)

A) B) C) D)

15. An air bubble in water behaves like a __________ lens. ( diverging )

16. The convex lens behaves as a _______ lens, when it is kept in a medium with refractive
index less than the refractive index of the lens. ( converging)
17. The convex lens behaves as a _______ lens, when it is kept in a medium with refractive
index greater than the refractive index of the lens. ( diverging)
18. What are materials required to find out the relation among the image distance, object
distance and focal length? ( convex lens, V-stand, light in candle and screen)
19. Which lens forms real and virtual images? ( convex lens)
20. In which case, image distance is equal as focal length of the lens?
Ans: When the light rays are parallel to the principal axis.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

1 Mark Questions:
1. Write the formula for formation of image by curved surfaces?
2. A man wants to get a picture of a zebra. He photographed a white donkey after fitting a
glass with black strips on the lens of his camera. What photo will he get? Explain.
3. If a white sheet of paper is stained with oil, the paper turns transparent. Why?
4. Draw the refracted ray given below diagram.

5. What is the focal length and power of a rectangular glass slab?

6. Tow thin lenses of powers +2D and +5D are placed in contact. Will the focal length of the
combined increase or decrease?
7. Write lens makers formula and explain the terminology in the formula.
8. Why is the power of lens measured as the reciprocal of its focal length?
9. A convex lens is make up of 5 different materials then how many images does it forms?
2 Marks Questions:
1. Distinguish between convex lens and concave lens?
2. Distinguish between real image and virtual image?
3. Why a lemon appears bigger than inside a glass of water compared to in air?
4. The focal length of converging lens is 20 cm an object is placed at 60 cm from the lens. Where
the image will be formed and what kind of image it is?
5. Suppose you are inside the water in a swimming pool near an edge. Your friend is standing on
the other edge. Do you find your friend is taller or shorter than his usual height? Why?
6. A double convex lens has two surfaces of equal radii ‘R’ and refractive index n=1.5 . find
the focal length ‘f’?
7. How focal length of convex lens changes when violet light is used instead of red light?
4 Marks Questions:
1. How do you find the focal length of a lens by using u-v method?
2. A student focused the image of flame on a white screen by placing the flame of various
distances from a convex lens. He noted his observations.
S.No. Distance of flame from the lens Distance of the screen from the lens
1 30 cm 10 cm
2 20 cm 12 cm
3 15 cm 15 cm
4 12 cm 20 cm
5 7.5 cm 35 cm
(a) From the above table find the focal length of lens without using lens formula?
(b) Which set of observations is incorrect and why?
(c) In which case the size of the object and image will be same? Give reason for your answer?
3. Complete the following table if the object is placed at various position in front of a
convex lens
Position of the object Position of image Nature of image
At infinity
Between F1 and 2F1
Same size real and inverted
Seen in the lens
4. Find the focus by drawing a ray diagram using the position of source S and the image S’
given in the figure

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

5. Two converging lens are to be placed in the path of parallel rays so that the rays remain
parallel after passing through both les. How should be lenses be arranged? Explain with
a neat ray diagram?
6. Draw the ray diagrams of convex lens for the following and describe the nature of
image.
a) When the object is beyond “2F2”
b) When the object is at “2F2”
c) When the object is between 2F2 and F2
d) When the object is between F2 and optic centre

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -5 HUMAN EYE AND COLOURFUL WORLD

½ Mark Questions:
1. Which physical quantity of light doesn’t change during refraction? ( frequency )
2. Which colour deviate minimum and maximum in a spectrum? [ B ]
A. Violet, red B) red, voilet C) blue, green D) green, blue
3. Matching (Ans:i-Q, ii-R )
(i) Myopia ( ) P) Bi-focal lens
(ii) Hypermetropia ( ) Q) Bi-concave lens
R) Bi-convex lens
S) Concavo-convex lens
4. Which type of lens is used to correct presbyopia? ( Bi-focal lens )
5. What is the distance between the eye lens and retina? (2.5 cm)
6. What is the angle of vision? ( 60°)
7. What is the value of least distance of distinct vision? ( 25 cm )
8. Maximum focal length of eye lens : 2.5 cm :: minimum focal length of eye lens :
(Ans: 2.27 cm)
9. Which type of lens is in our eye contains? [ B ]
A) Bi-concave lens
B) Bi-convex lens
C) Bi-focal lens
10. Which lens has more focal length?

11. Which lens has more power?

12. Matching [ C ]
(i) Power of lens ( ) a) cm
(ii) Focal length of lens ( ) b) No units
(iii) Refractive index of lens ( ) c) m/s
d) Di-optres
A. i-d, ii-a, iii-c B) i-d, ii-c, iii-b C) i-d, ii-a, iii-b D) i-c, ii-a, iii-d
13. P: Eye lens forms virtual image [ C ]
Q: Retina acts as a screen in the eye
A. P-true, Q-true B) P-true, Q-false C) P-false, Q-true D) P-false, Q-false
14. What is the possible value of least distance of distinct vision of a child aged 7 years [ B ]
A. 25 cm B) < 25 cm C) > 25 cm D) None of the above
15. Which colour has high frequency in VIBGYOR ( violet )
16. A person uses -2.5 D lens. What is his eye defect? ( Myopia )
17. Which part of eye protects the eye from high intensity light? ( Iris )
18. What type of image forms with eye lens? ( real and inverted )
19. What is a natural example for dispersion of light? ( rainbow )
20. Cones : identify colours :: Rods : ___________ ( intensity of light )

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

21. Chemical name of hypo is __________ ( sodium- thio-sulphate )

22. The phenomenon involved in Raman effect is ___________ ( scattering of light )
23. The minimum focal length of eye lens of hypermetropia person is _____ [ B ]
A. 2.27 cm B) > 2.27 cm C) < 2.27 cm D) all above
24. The maximum focal length of eye lens of myopia person is _____ [ A ]
A. < 2.5 cm B) > 2.5 cm C) = 2.5 cm D) all above
25. The process of adjusting the focal length of eye lens is called _____ ( accommodation )
26. Small hole in the iris is called __________ ( pupil )
27. Which atoms are responsible for the blue colour of the sky? ( N2, O2 )
28. X : Speed of light is constant in vacuum for all colours
Y : Speed of light depends on wave length of light when it passes through medium [ A ]
A. X,Y are correct B) X, Y are incorrect
C) X correct, Y incorrect D) X incorrect, Y correct
29. How does the power of a lens change, if its focal length doubled? ( halved )
30. Write the relation between angle of incidence and angle of emergence when the prism
is in minimum angle of deviation.
A. B) C) D) all of the above
31. At which angle the intensity of scattering is maximum ( 90°)
32. What type of visual defect will be there, if cones in retina are defective?
(colour blindness)
33. During the formation of bright rainbow, what is the angle between incoming and
outgoing rays ( 42°)
34. What is the transparent protective membrane located at the front portion of an eye?
A. retina B) iris C) pupil D) cornea
35. What is the liquid filled in eyeball behind cornea? ( aqueous humour)
1 Mark Questions:
1. Define dispersion of light
2. Define scattering of light
3. What is main cause of presbyopia?
4. What is the shape of rainbow?
5. Define accommodation of lens.
6. What is least distance of distinct vision?
7. Name the angles ‘A’ and ‘d’ in the figure

8. Which type of eye defect in the given figure? What type of lens is used to correct this
eye defect?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

9. If you sent a single colour through a prism. Does it split into more colours? Why?
10. What are the functions of rods and cones in the eye?
11. Define near point.
12. Define far point.
13. What happens, if the eye lens is unable to adjust focal length?
14. Can you imagine the shape of rainbow when you observed travelling in an aeroplane.
Write its shape.
15. What is the function of iris in our eye?
16. f=-50 cm, then find ‘P’.
2 Marks Questions:
1. Explain briefly the reason for the blue colour of the sky?
2. Why the sun appears during sunrise and sunset?
3. Why the sun appears white at noon hours?
4. Define presbyopia. How do you correct this defect?
5. Define power of lens. Write formula and units of it.
6. What is the formula to find the refractive index of prism? Explain the terms in it.
7. Doctors advised to use 2D lens. What is its focal length?
8. Find the refractive index of a prism whose minimum angle of deviation is 30° and angle
of prism is 60°?
9. The near point (H) is 50cm. Find the power of lens to correct his eye defect.
10. The far point (M) of a person is 100cm. Find the power of lens to correct his eye defect.

4 Marks Questions:
1. How do you appreciate the working of ciliary muscles in the eye?
2. What is myopia? How can you correct it?
3. What is hypermetropia? How can you correct it?
4. Write an activity to produce rainbow in your class room?
5. How do you find the refractive index of prism experimentally?
6. Explain the formation of rainbow?
7. Explain the structure of human eye?
8. Anand able to read name on black board from last bench. He is unable to read names in
his text book.
i) Which type of eye defect he is suffering from?
ii) Which type of lens is used to correct that defect?
iii) Draw the diagrams showing the defect and its correction.
9. Geetha is a last bench student. She is unable to draw pictures drawn on black board. She
get permission from teacher and sat in a first bench.
i) Which type of eye defect she is suffering from?
ii) Which type of lens is used to correct that defect?
iii) Draw the diagrams showing the defect and its correction.
10. Observe the graph and answer the following questions.
i) What is taken on Y-axis?
ii) ‘D’ indicates what?
iii) What is the relation between angle of incidence (i1) and angle of
emergence (i2) at point ‘D’?
iv) What is the shape of the graph?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -6 STRUCTURE OF ATOM

½ Mark Questions and Answers:

1. How many maximum electrons can be accommodated in M-shell? ( 18 )
2. Which rule is violated in the electronic configuration of ? (Aufbau principle)
3. What is the shape of s-orbital? ( Spherical )
4. ( ) values of and are in the following manner [ B ]
A) 3, 4 B) 3,5 C) 4, 4 D) 4, 5
5. Choose the correct statement from the following [ ii ]
(i) Niels Bohr proposed elliptical orbitals.
(ii) Sommerfeld proposed elliptical orbitals
(iii) Erwin Schrodinger proposed elliptical orbitals
6. A : Electrons enters into orbital after filling , but not (Ans: c )
R : ( ) value of is less than ( ) value of
a) A is correct and R is wrong
b) A is wrong and R is correct
c) Both A and R are correct
d) Both A and R are wrong
7. What are the orbitals have same ( ) value among and
orbitals
8. What is the shape of and orbital? ( dumbbell )
9. Observe the table and write the representation of electron

3 0 0 +½
10. In the below table in which shell, the sub-shells are wrongly represented? ( K-shell)
Shell Name of the sub-shell present
K
L
M
11. Write the principle quantum number for M-shell ( n=3 )
12. In which shell, sub-shell is present? (M-shell)
13. Write the value of Plank’s constant?
Ans: (or)
14. Which of the element possesses fully filled degenerate orbital configuration?
(Na, Ca, B, Ne, Cl) ( Ans: Ne )
15. Which of the following electromagnetic radiation has higher wave length than visible
light? X-rays, γ-rays, UV-rays and Radio waves. (Ans: Radio waves)
16. Choose the suitable answers for section B with section A
SECTION-A SECTION-B
(i) Sodium P)
(ii) Neon Q)
(iii) Oxygen R)
Ans: (i)-R, (ii)-Q, (iii)-P

1 Mark Questions:
1. Define electromagnetic spectrum?
2. What is meant by degenerate orbitals?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

3. Define electronic configuration?

4. Following orbital diagram shows the electron configuration of oxygen atom, which rrule
does not support this?

5. Write the electronic configuration of ‘Cr’ and ‘Cu’?

6. Which quantum number gives size and energy of the main shell?
7. What is the shape of d-orbital? Write the names of d-orbitals?
8. What is this information given by angular momentum quantum number ( l )?
9. An element has atomic number 17. How many electrons are present in K, L and M-shells
of the atom?
10. What is an absorption spectrum?
11. Which electron shell is at a higher energy level K or L?
12. What is method?
2 Marks Questions:
1. Rainbow is an example for continuous spectrum. Explain?
2. An electron in an atom has the following set of four quantum numbers to which orbital
it belongs to and name that element?

2 0 0 +½

3. Write the four quantum numbers for electron?

4. Explain Hund’s rule with an example?
5. Explain why electrons enter into but not after filling the orbital?
6. The wavelength of a radio wave is 1.0m. Find its frequency?
7. The electronic configuration of an atom is
a) Which element atom is it?
b) In which orbital last electron is in?
c) What is the value of principle quantum number of first electron?
d) Write the electronic configuration of the same atom in the excited state?
8. The electronic configuration of an atom is . What information that it
gives?
9. Following orbital diagram shows the electron configuration of nitrogen atom. Which rule
does not support this? Write the correct electronic configuration. N(Z=7)

4 Marks Questions:
1. Explain Bohr’s model of atom and its limitations?
2. Write the differences between orbit and orbital?
3. Explain the significance of three quantum numbers in predicting the position of an
electron in an atom?
4. State and explain Pauli’s exclusion principle?
5. Which rule is violated in the electronic configuration of ?
6. State and explain with one example of Aufbau principle?(Building up principle)

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

7. Complete the following table

Sub shell No. of values Max. no. of
‘ ’ value
name orbitals electrons
s 1 2
p 3 -1,0,+1
d 2 -2,-1,0,+1,+2
f 3 14
8. The electronic configuration of an element ‘X’ is . Then the answer
the following questions?
(i) What is the atomic number of element ‘X’?
(ii) What is the name of the element ‘X’?
(iii) How many electrons are present in the outermost shell of an atom?
(iv) How many shells are present in this atom of an element?
9. Draw the shapes of s, p, and d orbitals?
10. Draw a neat diagram to show that increasing order of energy levels of orbitals?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -7 Classification of Elements-The Periodic Table

½ Mark Questions and Answers:

1. Who is the first to classify elements?
Ans: Dobereiner
2. Who introduced triads theory to classify elements?
Ans: Dobereiner
3. Who proposed the law of Octaves?
Ans: John Newlands
4. Who proposed the following periodic law?
“The properties of elements are the periodic function of their weights”
Ans: Mendeleeff
5. Who proposed the modern periodic law to classify elements?
Ans: Moseley
6. What is general valency configuration of inert gases?
Ans:
7. Which element has highest electronegativity?
Ans: Fluorine
8. Which element has least electronegativity?
Ans: Cesium
9. Which element has highest electron affinity?
Ans: Chlorine
10. Highest electronegativity : Fluorine :: Highest electro positivity : ________
Ans: Cesium
11. Arrange K, Na, Mg in decreasing order of their atomic size
Ans: K > Na > Mg
12. Matching
1. Alkali earth metal a. VII A group
2. Alkali metal b. IA group
3. Halogens c. II A group
Ans: 1-c, 2-b, 3-a
13. Which element has twice as electrons in its second shell as its first shell?
Ans: Carbon
14. Statement-1 : 18th group elements having highest ionization energy
Statement-2 : 1st group elements not having highest metallic nature
1. Statement-1 true, Statement-2 false 2. Statement-1 false, Statement-2 true
3. Statement-1 false, Statement-2 false 4. Statement-1 true, Statement-2 true
Ans: Statement-1 true, Statement-2 false
15. Which of the following is not correct?
1. Metallic character increases on moving down the group
2. Electropositive character decreases across a period
3. Electronegative character decreases down the group
4. Non-metallic character decreases across a period
Ans: Non-metallic character decreases across a period

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

16. Find the correct statement

1. Elements in the same period have equal valence
2. In a period, metallic character increases from left to right
3. Elements in a same group have the same atomic size
4. In a period atomic size decreases from left to right
Ans: In a period atomic size decreases from left to right
17. Eka-boron : Scandium :: Eka-aluminium : _______
Ans: gallium
18. 1 Å= _______ ( Ans: 10-8 cm)
1 Mark Questions:
1. What is the need of the periodic table?
2. Define Dobereiner’s law of triads?
3. Give two examples of Dobereiner’s triads?
4. State Mendeleeff’s periodic law and modern periodic law?
5. Which group elements are called Halogens?
6. An element X belongs to 3rd period and group 2 of the periodic table. State
(a) The no. of valence electrons
(b) The valency
7. Predict the reason for placing inert gases in the 18 th group?
8. Define law of Octaves?
9. If the atomic no. of an element is 13. Write its group and period in the modern periodic
table?
10. What are called Lanthanoids?
11. The atomic number of an element is 17. Write its group and period in the modern
periodic table?
12. How does metallic character change when we move down a group and across a period?
13. How many periods and groups in modern periodic table?
14. Which group elements will from an acidic oxide?
15. Elements A,B,C and D have atomic numbers 1,8,11 and 19 respectively. Which elements
belong to IA- group?
16. Write the correct increasing order of the atomic radii of O,F and N
17. Which pair of elements having atomic numbers given below has similar properties
1. Z=7, z=15 2. Z=12, z=21 3. Z=16, z=17 4. Z=1, z=4
18. Which atom bigger in size Ne or Ar? Why?
2 Marks Questions:
1. An element has atomic number 19. Where would you expect this element in the periodic
table. Why?
2. The electronic configuration of sodium is . What is the information that it
gives?
3. How does the periodic property of atomic size changes in groups and periods?
4. An element has atomic number 17. Where would you expect this element in the long
form of periodic table?
5. How do you appreciate the role of electronic configuration of the atoms of elements in
periodic classification?
6. Using the periodic table predict the formula of compound between and element X of
group 13 and another element Y of group 16.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

7. An element X belongs to 3rd period and group 16 of the periodic table. State its
a. Electronic configuration
b. Valence
8. An element ‘E’ has following electronic configuration
K L M
2 8 7
a. To which group of the periodic table does element ‘E’ belong?
b. To which period of the periodic table element ‘E’ belong?
c. State the number of valence electrons present in element ‘E’.
d. State the valence of the element.
9. How does the metallic nature change when move down a group and across a period?
10. Name two elements that you would expect to have chemical properties similar to Mg.
what is the basis for your choice?
11. An element X belongs to 3rd period and group 2 of the periodic table. State
a. The number of valency electrons
b. Valence
c. Whether it is metal or a non-metal
4 Marks Questions:
1. What are the salient features of Mendeleeff ‘s periodic table?
2. What are the properties of Atomic radius, Ionization energy, Electron affinity and
Electron negativity of elements and their trends in the groups and periods?
3. Define modern periodic law? Discuss the construction of the long form of the periodic
table.
4. Explain how the elements are classified into block elements and the
advantages of this kind of classification.
5. Elements in the short period of the periodic table are given below in the order from left
to right Li, Be, B, C, N, F, Ne
Answer the following questions:
(i) To which period to these elements belong?
(ii) One element of this period is missing. What is the missing element and where it
should be placed?
(iii) One of the above elements belongs to the family of halogens. What is its
electronegative value?
(iv) How does the metallic character vary in the period?
6. Complete the following table
Element Valancy Group Number Period Number
Hydrogen 1
Neon 2
Potassium 1
Magnesium 2

7. The electronic configuration of A, B, C, E, and E are as follows

A- B- C- D-
E-
Based on the above information answer the following questions
(i) Which of these belongs to same group?
(ii) Which of these belong to same period?
(iii) Name of the element E?
(iv) Which element belong to -block?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

8. Define Ionization energy? What are the factors that influence it?
9. Write down the characteristics of the element having atomic number 17.
1.Electronic configuration, 2.Period number, 3. Group number, 4. Element family,
5. No. of valency electrons, 6. Valence, 7. Metal or Non-metal and 8. Block
10. Comment on the position of Hydrogen in periodic table.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -8 CHEMICAL BONDING

½ Mark Questions and Answers:

1. In Lewis dot structure dots around an element represents -- Ans: Valence electrons
2. According to the dot structure which of the following is correct? [ C ]

A) B) C) D)

3. Which of the following is cation? [ C ]

A) B) C) D)
4. Theory Scientist [ D ]
(i) VSEPRT a) Linus Pauling
(ii) Valence Bond Theory b) Lewis and Kossel
(iii) Electron theory of Valence c) Sidgwick and Powell
A) i-a, ii-b, iii-c B) i-b, ii-a, iii-c C) i-c, ii-b, iii-a D)i-c, ii-a, iii-b
5. According to Lewis dot structure which element is this? [ B ]
6. Statement A : Bond angle in between is 107°48’ [ A ]
Statement B : It is due to lone pair-Bond pair repulsion
a) Both A and B are true and B is correct explanation
b) A is correct , B is wrong
c) A is wrong, B is correct
d) Both statements are wrong
7. Bond formation due to transfer of electrons is called ________ (Ionic Bond)
8. Bond formation due to sharing of electron is called _________ (Covalent Bond)
9. Identify the bonds in the diagram [ D ]

A)1 - π, 2 – σ, 3 – π B) 1 - π, 2 – π, 3 – σ C) 1 - π, 2 – π, 3 – π D) 1 - σ, 2 – π, 3 – π
10. Molecule Bond angle [ B ]
(iv) O a) 109°28’
(v) b) 120°
(vi) c) 104°31’
A)i-a, ii-b, iii-c B) i-c, ii-a, iii-b C) i-b, ii-c, iii-a D)i-c, ii-b, iii-a
11. An element belongs to IIA group. How many electrons will it lose in bond formation? [B ]
A) B) C) D)
12. Valency of VII A group element is __________ (Ans: 1)
13. Hybridisation of atomic orbitals was proposed by __________ (Linus Pauling)
14. The molecules with decreasing order of bond angle is ______ [ B ]
A) B)
C) D)
15. Write the formula of a compound when an element X of Group IIA reacts with an
element Y of Group VIIA (Ans: XY2 )

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

1 Mark Questions:
1. Define Octet rule?
2. Draw Lewis dot structure for Ne?
3. What is Ionic bond?
4. What is VSEPRT?
5. What is hybridization?
6. Draw the diagram of NH3?
7. Atomic number of an element is 17. How many electrons will it lose or gain to form an
ion?
8. Write names of 2 compounds which have ionic bond?
9. What is the hybridization of Boron in and Nitrogen in ?
10. What is covalent bond?
2 Marks Questions:
1. Write differences between sigma (σ) and pi (π) bond?
2. Why do only valence electrons involve in the bond formation? Why not electrons in the
inner shell?
3. By looking at the Lewis dot structure of Raghava got some doubts in his mind. What
could be those?
4. Na forms only ionic bond. Why?
5. What type of bond is formed between ‘X’ having electronic configuration 2,8,1 and ‘Y’
having electronic configuration 2,8,7? Why?
6. Bond angle in is 180°, but in is 104°31’. Why?
7. Two elements A and B have atomic numbers 11 and 17 respectively. Which atom can
form Cation and which can form an anion? Why?
4 Marks Questions:
1. Explain the formation of O2 molecule using valence bond theory?
2. What is hybridization? Explain the formation BF 3 using hybridization?
3. Write difference between ionic bond and covalent bond?
4. Answer the following questions using the given table.
Atom Group
C IVA
N VA
O VIA
F VIIA
(i) How many lone pair electrons are there in oxygen atom?
(ii) Which element has -1 oxidation state?
(iii) Which element has -2 oxidation state?
(iv) Which element has one lone pair of electrons?
5. Draw a diagram of bond formation of N2 molecule and label σ and π bonds?
6. How Lewis dot structure helps in understanding bond formation between atoms?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -9 ELECTRIC CURRENT

½ Mark Questions and Answers:

1. Which instrument among the following is used to measure electric current? [ A ]
A) Ammeter B) Voltmeter C) Voltameter D) Rheostat
2. Match the following
1) Ampere A) electric power
2) Volt B) electric current
3) Ohm C) potential difference
4) Watt D) resistance
Ans: 1-B, 2-C, 3-D, 4-A
3. Among the following symbols which is used as fuse in a circuit is ______

A) B) C) D)
4. The equivalent resistance in (i) and (ii) is ________ and ________ (Ans:18Ω, 4Ω)

(i) (ii)
5. Match the following
1) Ampere A) Volt-Ampere
2) Volt B) Volt/Ampere
3) Ohm C) Coulomb/Sec
4) Watt D) Joule/Coulomb
Ans: 1-C, 2-D, 3-B, 4-A
6. Match the following
1) I (current) A)
2) V (potential difference) B)
3) P (electric power) C)
4) R (resistance) D)
Ans: 1-B, 2-D, 3-A, 4-C
7. Ohmic conductors graph among the following is _____ [ A ]

A) B) C) D)

8. 1 KWH = _________ Joules [ A ]

A) B) C) D)
9. Semiconductors are used to make _____________ [ D ]
A) Diodes B) Transistor C) Integrated circuits D) All the above
10. A uniform wire of resistance 100Ω is cut into five equal parts. These parts are now
connected in parallel. Then the equivalent resistance of the combination is _____ [ B ]
A) 100Ω B) 4Ω C) 20Ω D) 10Ω
11. The reciprocal of resistivity is called as _____________ ( Ans: Conductivity)
12. The bulb filament is made up of _______________ ( Ans: Tungsten)
13. What is the unit of resistivity (or) specific resistance? ( Ans: Ohm-m)
14. An unknown circuit draws a current of 2A from 2.0V battery. Its equivalent resistance is
____________ (Ans: 10Ω)

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

15. The obstruction of the flow of electrons is called ___________ ( Ans: Resistance)
16. Which statement from the following two are (is) correct? ( Ans: Both P and Q are true)
P : Ammeter is always connected in series in a circuit
Q : Voltmeter is always connected in parallel in a circuit
17. Which statement is correct from the following? ( Ans: Both P and Q are true)
P : in series combination same current flows through the resistors.
Q : in parallel combination same potential difference is applied across all resistors
18. What is the value of in the circuit? (Ans: 0.1A)

19. The drift speed of electrons in copper is _________ (Ans: or 0.07 )

20. To prevent damage due to overloading we connect __________ to the house hold
circuit. (Ans: fuse)
1 Mark Questions:
1. What is electric current?
2. Why we use tungsten for making the filament of a bulb?
3. What is an electric shock?
4. What is electric power?
5. What is conductivity?
6. What do you mean by overloading?
7. How the head lights of a car connected? Why?
8. Define lattice.
9. What is multimeter? Mention its two uses.
10. Give examples for semi conductors?
11. What is the full form of I.C.
12. What are the characteristics of a fuse wire?
13. Find I in the circuit?

14. What is electric energy?

15. What is the meaning of ‘lines’ in household circuit?
2 Marks Questions:
1. Differences between potential difference and emf?
2. Differences between Ohmic and Non-ohmic conductors?
3. Differences between Resistance and Specific resistance?
4. Resistivity values of different substances are given below
Substance Copper Nichrome

Ω-m (at 20°C)

(i) Which is used as conductor? Why?

(ii) Which is used as heating element? Why?

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

5. Draw a circuit diagram to verify non-ohmic conductors experimentally?

6. A wire of length 1m and radius 0.1 mm has a resistance of 100Ω. Find the resistivity of
the metal?
7. Two bulbs have ratings 100W, 220V and 60W, 220V. Which one has the greater
resistance?
8. Why don’t we use series arrangement of electrical appliances in domestic circuits?
9. Derive
4 Marks Questions:
1. State Ohm’s law. Suggest an experiment to verify and explain the procedure.
2. Explain Kirchhoff’s law with examples.
3. How can you appreciate the role of a small fuse in house wiring circuit in preventing
damage to various electrical appliances connected in the circuit?
4. Deduce the expression for the equivalent resistance of three resistors connected in
series?
5. Deduce the expression for the equivalent resistance of three resistors connected in
parallel?
6. A house has 3 tube lights, two fans and a television. Each tube light draws 40W, the fan
draws 80W and TV draws 60W. On the average all the tube lights are kept on for five
hours, two fans for 12 hours and the TV for five hours every day. Find the cost of electric
energy used 30 days at the rate of Rs.3 per Kwh.
7. An experiment is done to know a given material is Ohmic or Non-
ohmic. V-I graph is as shown from experimental observations.
By observing the graph, answer the following questions.
(i) According to Ohm’s law which type of material is it?
(ii) Calculate the resistance for any two values of V on X-axis.
(iii) Calculate the current when 10V is applied across the
resistance?
(iv) Calculate the P.D. when there is a current of 4A in the circuit.

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

Chapter -10 PRINCIPLES OF METALLURGY

½ Mark Questions and Answers:

1. Which furnace is used for smelting? [ B ]
A) Reverberatory B) Blast furnace
C) Rotary hearth furnace D) Electro thermal furnace
2. What is the composition of gasohol _________ (Ans: 90% petrol + 10% ethanol)
3. Which method is suitable for purification blister copper__________(Ans: Poling method)
4. The most abundant metal in the earth’s crust is ____________ [ C ]
A) Silver B) Zinc C) Aluminium D) Iron
5. Which method is very useful for purification low boiling metals? (Ans:distillation)
6. The impurity present in the ore is called as __________ [ A ]
A) gangue B) flux C) slag D) ore
7. X : A Pyrochemical process in which the ore is heated in the presence of air is called
calcinations.
Y : A Pyrochemical process in which the ore is heated in the absence of air is called
roasting.
A) X is correct, Y is wrong B) X is wrong, Y is correct [ D ]
C) Both X and Y are correct D) Both X and Y are wrong
8. Match the following [ B ]
1) Horn silver A)
2) Rock salt B)
3) Cinnabar C)
4) Galena D)
5) Lime stone E)
A) C,D,B,E,A B) C,D,A,E,B C)C,D,B,E,A D)D,E,B,A,C
9. Match the following [ B ]
Group A Group B
(i) Low reactive element a)
(ii) Moderate reactive element b)
(iii) High reactive element c)
A) i-a, ii-b, iii-c B) i-c, ii-a, iii-b C) i-c, ii-b, iii-a D)i-b, ii-c, iii-a
10. The reducing agent in thermite process is______ [ D ]
A) B) C) D)
11. The oil used in the froth floatation process is _______________ [ B ]
A) Kerosene oil B) Pine oil C) coconut oil D) olive oil
12. How many water molecules are present in Epsom salt [ C ]
A) 4 B) 5 C) 7 D) 6
13. The metal that occurs in the native form is ________ [ B ]
A) B) C) D)
14. Which of the following is the correct formula of Gypsum? [ D ]
A) B) C) D)
15. Which of the following is a carbonate ore? [ D ]
A) Galena B) Bauxite C) Gypsum D) Magnesite

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 S.S.C. PUBLIC EXAMINATIONS 2022 - PHYSICAL SCIENCE

1 Mark Questions:
1. Which method is suitable to enrich Sulphide ores?
2. Arrange the metals and in increasing order of their chemical reactivity?
3. Write the name of any two ores of Iron?
4. What is metallurgy?
5. What is meant be furnace?
6. What are the metals present in the Bronze alloy?
7. Write the chemical formula for hydrated ferric oxide (Rust)?
8. What is a stainless steel?
2 Marks Questions:
1. What is thermite process? Mention its applications in daily life?
2. Where do we use hand picking and washing methods in our daily life? Give examples?
3. Write unit chemical formula of the following ores?
a)Copper Iron Pyrites b) Cinnabar
4. which method do you suggest for extraction of high reactivity metals? Why?
5. How do metals occur in nature. Give examples to any two types of minerals?
6. Write differences between roasting and calcination?
7. List four metals that are found in nature as oxide ores?
8. List four metals that are found in nature in uncombined form?
9. Define gangue and slag?
10. Write short notes on froth floatation process?
4 Marks Questions:
1. Suggest an experiment to prove that the presence of air and water are essential for
corrosion. Explain the procedure?
2. Write short notes on each of the following?
1. Roasting 2.Calcination 3.Smelting 4.Gaunge
3. Draw a neat diagram of Reverberatory furnace and label it neatly?
4. Draw the diagram showing i)Froth floatation ii) magnetic separation?
5. What is activity series? How it helps in extraction of metals?
6. Draw a neat diagram of Blast furnace and label it neatly?
7. Write notes on dressing of ore in metallurgy?
8. Fill in the below table
ORE Formula Metal
Galena Pb
Ca
Carnallite
Pyrolusite Mn

Al

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