School - Data - DMIS - Assignment - 142168 - Gr10 - Science - Revision WS - PA1
School - Data - DMIS - Assignment - 142168 - Gr10 - Science - Revision WS - PA1
School - Data - DMIS - Assignment - 142168 - Gr10 - Science - Revision WS - PA1
(i) Identify and explain the reaction from the given figure.
(ii) Write the balanced chemical equation for the reaction involved.
(iii) Mention one characteristic observation that can be made during the reaction and
its reason.
7. 2 g of lead nitrate crystals are heated in a boiling tube.
(i) State the colour change before heating and after heating.
(ii) Name the gases produced during heating.
(iii) Write the chemical equation for the reaction.
8. What is villi? What are its functions?
9. How are lungs designed in human beings to maximize the area of exchange of gases?
10. Discuss the major steps involved in process of nutrition in human beings.
11. How are fats digested in our bodies? Where does this process take place?
12. Label the parts of the human respiratory system. Also, write their functions.
13. Label the diagram of digestive system and write their functions.
14. If the image formed by a spherical mirror for all positions of the object placed in front of
it is always erect and diminished, what type of mirror is it? Draw a labelled ray diagram
to support your answer.
15. The linear magnification produced by a spherical mirror is +1/3. Analysing this value
state the (i) type of mirror and (ii) position of the object with respect to the pole of the
mirror. Draw any diagram to justify your answer.
16. A student wants to project the image of a candle flame on a screen 48 cm in front of a
mirror by keeping the flame at a distance of 12 cm from its pole.
(a) Suggest the type of mirror he should use.
(b) Find the linear magnification of the image produced.
(c) How far is the image from its object?
(d) Draw ray diagram to show the image formation in this case.
17. The refractive indices of three media are given below:
(a) Write the serial number of the observation which is not correct. On what basis have
you arrived at this conclusion?
(b) What is the focal length of the convex lens? Give reason to justify your answer.
(c) Select an appropriate scale and draw a ray diagram for the observation at
S. No. 2. Also find the approximate value of magnification.
19. A divergent lens has a focal length of 40 cm. At what distance should an object of
height 5 cm from the optical centre of the lens be placed so that its image is formed 20
cm away from the lens? Find the size of the image also.
20. Calculate the image distance for an object of height 12 mm at a distance of 0.20 m from a
concave lens of focal length 0.30 m, and state the nature and size of the image.