Which of the following is artificial light?

We cannot see the object in the dark because . . . .

Which of the following is opaque object?

We see an object when . . . enter our eyes.

When an object blocks . . . , its shadow is formed.

Which of the following is natural light?

Rubbing and burning can give off . . . .

Look at the picture! Heat changes the . . . of the shirt.

Heat can keep . . . our body.

Heat . . . the shape, size, colour and texture of the objects.

Heat changes the . . . of the bread.

We can make . . . to keep us warm in the night camping.

Heat changes the size of the candle. The candle becomes . . . .

When we are far away from a sound, the sound is . . . .

When we are . . . a sound, the sound is loud.

Which animal makes a loud sound?

Which object in your bedroom makes a sound?

What a thing moves, it . . . and makes a sound.

The ringing of telephone makes . . . sound.