MCQ Questions

Question No. 1

State True or False and correct the false statements giving reasons.

Answer :

(1) We see the Moon because it is a luminous source of light.

(2) Opaque objects absorb the light and some light is reflected so we see them.

(3) We see various things because our eyes has light.

(4) On a cloudy day shadows are not formed.

(5) Image in the pin hole camera has a left-right reversal.

(6) In solar eclipse we can’t see the Moon.

(7) If there is lunar eclipse it must be full Moon night.

Question No. 2

Fill in the blanks

Answer :

(1) When a beam of light meets an obstacle it does not _________.

(2) Medium that allow light to pass partially is called _________.

(3) When the source of light is larger than the object the size of umbra is _________.

(4) The darkest portion of a shadow is called _________.

(5) An image shows colour but a shadow _________.

(6) In a pinhole camera when the object comes near the image becomes _________.

(7) In case of a Solar eclipse the heavenly body that is in the middle is _________.

Question No. 3

Short answer type questions

Answer :

(3) Give an example of bioluminescence.

(2) If air can flow through a curved pipe, why can’t light travel through it?

(4) Define an opaque body.

(6) Where is the image formed in a pinhole camera?

(1) Name two artificial and natural sources of light.

(5) Give a reason why a shadow is formed?

(7) What is the use of a pinhole, in a pinhole camera?

Question No. 4

Long answer type questions

Answer :

(5) Most of the objects around us are non-luminous; yet how are we able to see them?

(7) What are the differences between a shadow and the image of an object?

(1) Explain how we are able to see an object?

(2) What is meant by rectilinear propagation of light? Explain giving example.

(3) How can we calculate the size of the object from a pinhole camera?

(4) How does the shadow of a tree move even though the tree remains in its position?

(6) How does the image in a pinhole camera change in the following conditions: (a) There are two holes close by. (b) Distance between the screen and the hole is increased.

Question No. 5

Match the column

Answer :

Question No. 6

Which of the following is not a luminous source of light?

Answer :

Fireflies

Lightning in a thunderstorm

The Moon

The stars

Question No. 7

The lenses of our reading glasses are made of

Answer :

Opaque material

Transparent material

Translucent material

Both (b) and (c)

Question No. 8

We cannot see the Sun through a bent pipe, it indicates that:

Answer :

The Sun has not risen

Light from the Sun does not bend

The observer is standing in shade

The pipe has air

Question No. 9

Formation of shadows indicates that -

Answer :

Light is not a visible form of energy.

Light travels in a straight line.

Shadows can be formed by all kinds of objects.

Shadows absorb all the light.

Question No. 10

Which of the follow is true for shadow of a tree in the open ground?

Answer :

The shadow of the tree will always remain stationary.

The size of the shadow will remain constant.

The colour of the shadow will remain green.

The size and position of the tree’s shadow can change

Question No. 11

Which of the following is not a property of the image formed in a pinhole camera?

Answer :

It in smaller in size.

It is inverted.

It has the same colours as the object.

It is of the same size as the object.

Question No. 12

Why inverted images are formed in a pinhole camera?

Answer :

There is automatic inversion of image in the camera.

A lot of light from the object has to stay outside the pinhole.

Because light travels in a straight line.

Because usually the camera are small.

Chapter

Enter Your Book Codewwww

Enter Your Book Code

Insert 6 Digit Book Code

Enter the code sent to