Page 100 - Viva ICSE Science 4 : E-book

B. Tick () the correct answer.

1. Light travels at a speed of ____________ m/s.

8
10
5
(a) 3 × 10 (b) 3 × 8 (c) 3 × 10
2. Shadow forms on which side of the source of light?
(a) Same side (b) Opposite side (c) Top side

3. ____________ colour is not a part of VIBGYOR.

(a) Blue (b) Green (c) Black

4. ____________ objects become visible only when light falls on them.

(a) Luminous (b) Non-luminous (c) Shadow

5. ____________ objects form faint shadows.
(a) Transparent (b) Translucent (c) Opaque

C. Name the following.

1. A living organism which has the ability to produce light ______________

2. Bouncing back of light rays as they fall on a surface ______________

3. When light bends slightly while passing through
diff erent medium, it is called ______________

4. Objects that emit light of their own are called ______________

5. Light sources made by man are called ______________

6. Sources of light that occur naturally are called ______________

D. Match the following.

Column A Column B
1. Transparent materials (a) allow only little amount of light to

pass through them

2. Translucent materials (b) dark shape formed on a surface when
an object comes in the path of light

3. Opaque materials (c) allow light to pass through them easily

4. Shadow (d) luminous object

5. Candle (e) do not let light to pass through them

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