Page 117 - Viva ICSE Science 5 : E-book

5. A solar eclipse lasts for only ____________.

(a) few seconds (b) few minutes

(c) few hours (d) None of the above

D. Answer the following questions.

1. Defi ne light. Name some artifi cial and natural sources of light.

2. Classify objects based on their ability to allow light to pass through them.
Defi ne each type.

3. What is a shadow?

4. What are the conditions required for the formation of a shadow?
5. Defi ne rotation. Explain how rotation causes the formation of day and night?

6. Defi ne eclipse. Explain its types with the help of well-labelled diagrams.

THINK AND ANSWER

1. What happens to a shadow when the light source is moved further away?
2. What kind of shadow will be formed in:
a. dim light?
b. bright light?
3. What do you think will happen if the earth stops rotating?

TALK ABOUT

Discuss in class why it is not good to study in a dimly lit room.

LINK AND LEARN

Discuss in class how the movement of earth around the sun causes changes in seasons.

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