Question

D. Answer the following questions in short.
1. Write any two properties of light.
2. What is a shadow? How is it formed?
3. List three characteristics of a shadow.
4. Define rotation of Earth and state its importance.
5. Define revolution the Earth and state its importance.
for
class 5th
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Answer 1

Answer:

1) two properties of light:

a) Light is an electromagnetic wave.

b) light doesn't require any medium to travel.

2) Shadow is formed when an opaque or translucent object comes between rays of light.

3) characteristics of shadow:

a) it is always black in color

b) it depends on the shape of the object

c) it depends on direction of source of light

4) when earth rotates on its own axis is called rotation of earth. it is important as it causes day and night

5) when earth rotates around the sun on its orbit it is called revolution of earth. it is important as it causes different seasons

Answer 2

Answer:

1.Reflection of light.

Refraction of light.

2.A shadow is a space where light from a light source is blocked by an opaque object. A shadow is formed when a part of light is blocked by the opaque object.

3.A shadow is always a dark area. It does not show the colour of the object.

ii] A shadow may or may not look like the actual shape.

iii]The size of the shadow depends on the distance of the object and the screen.

4.

Rotation of the Earth is its turning on its axis. It's importance  is that Earth takes 24 hours to complete a rotation with respect to the sun.

5.Revolution is the movement of the Earth around the Sun. It's importance  is that it is setting up the seasons.

Explanation:

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