Question 1

Which of the following is a natural source of light?

Accepted Answer

The Sun is a natural source of light because it produces its own light through nuclear reactions, whereas a torch, candle, and electric bulb are man-made or artificial sources of light.

Question 2

Light travels along a:

Accepted Answer

Light travels along a straight line path. This phenomenon is known as the rectilinear propagation of light, which is demonstrated by the formation of shadows and beams of light.

Question 3

An image formed by a plane mirror is always:

Accepted Answer

A plane mirror always forms an erect (upright) and virtual image. The size of the image is equal to the size of the object, and it is laterally inverted.

Question 4

Which mirror is used as a rear-view mirror in vehicles?

Accepted Answer

Convex mirrors are used as rear-view mirrors in vehicles because they give an erect, diminished image of traffic spread over a large area, providing a wider field of view.

Question 5

An image that can be obtained on a screen is called:

Accepted Answer

A real image can always be obtained on a screen because light rays actually intersect at the position of the image. In contrast, virtual images cannot be captured on a screen.

Light — NCERT Class 7 Science Important Questions & Revision Notes