Page 139 - Active Science 5 Ebook and Activity

4. Which of the following is an opaque object?

a. Frosted glass b. Wall
c. Water d. Waxed paper

5. Identify which object does not form a shadow?
a. Pencil b. Book
c. Clear glass d. Cardboard

B. Write three examples for each of the following.

1. Luminous objects ________________________________________

2. Non-luminous objects ________________________________________

3. Transparent objects ________________________________________
4. Translucent objects ________________________________________

5. Opaque objects ________________________________________

6. Things necessary for formation of a shadow ________________________________________

C. Fill in the blanks.
1. _________________objects emit their own light.

2. Transparent objects allow ____________ to pass through them completely.
3. Waxed paper, butter paper and frosted glass are _______________ objects.
4. _______________objects block the light falling on them from a light source.

5. A shadow is formed by ______________ and _________________ objects.
6. The colour of the _______________ is not same as that of the ______________.

7. A shadow is formed on ______________ side of the light object.
8. A shadow is always ________________.

D. State whether the following statements are true or false.

1. Those objects which produce their own light are called luminous objects. ________
2. We cannot see clearly through a glass. ________

3. We cannot see through opaque objects. ________
4. Transparent objects do not form shadows. ________

5. Shadows are of different colours. ________
6. Shadow of an object is bigger than the object if light source is close to it. ________

E. Match the following.
1. Luminous a. our body

2. Opaque b. clear glass
3. Plastic cover c. bulb
4. Transparent d. opaque object
5. Shadow e. transparent

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