Which of the following is not always necessary to observe a shadow?

1

(a)

Sun

(b)

Screen

(c)

Source of light

(d)

Opaque object

Which of the following is a transparent object?

1

(a)

Glass shut

(b)

Pencil

(c)

Chair

(d)

Table

 The objects which partially allow the light to pass through it are called 

1

(a)

transparent

(b)

luminous

(c)

opaque

(d)

tanslucent

Shadows are______________ from images.

1

(a)

different

__________________shadow is called penumbra.

1

(a)

Partial

Light helps us to__________________objects.

1

(a)

see

Mirror does not change the direction of light falls

1

(a) True

(b) False

Lateral inversion is a phenomenon of changing left to right and vice-versa.

1

(a) False

(b) True

The image of a yellow rose is black in colour.

1

(a) False

(b) True

Images are similar to shadows.

1

(a) True

(b) False

Compare pinhole image with the shadow of some objects.

2

(a)

In case of a plane mirror, mention what kind of image cannot be obtained on the screen.

2

(a)

How do we see the objects around us?

2

(a)

Can we see any object in a completely dark room?

2

(a)

Is the light from a far away object able to travel to our eyes through opaque objects?

2

(a)

State some of the properties of light.

3

(a)

Differentiate between a shadow and an image.

3

(a)

Suggest any two means for the conversion of a transparent glass sheet into a translucent sheet.

3

(a)

Explain the reason of using a silver glass as a mirror.

3

(a)

Differentiate between a luminous and non-luminous objects.

3

(a)

Explain with the help of a diagram that how can we see an image behind wall using a periscope.

5

(a)

A student had a ball, a screen and a torch in working condition. He tried to form a shadow of the ball on the screen by placing them at different positions. Sometimes,1he shadow was not obtained. Explain.

5

(a)

A football match is being played at night in a stadium with flood lights ON. You can see the shadow of a football kept at the ground but cannot see its shadow when it is kicked high in the air. Explain.

5

(a)