set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

An optician while testing the eyes finds the vision of a patient to be 6/12. By this he means that

a) the person can read the letters of 6 m which the normal eye can read from 12 m

b) the person can read the letters of 6 inches from a distance of 12 m

c) the person can read the letters of 12 inches from 6 m

d) the focal length of eye lens had become half that of the normal eye

Question : 2

What should be refractive index of a transparent medium to be invisible in vacuum?

a) > 1

b) 1

c) < 1

d) None of these

Question : 3

To hear a clear echo, the minimum distance between the reflecting surface and the observer should be

a) 165 metre

b) 16.5 feet

c) 165 feet

d) 16.5 metre

Question : 4

The technique to integrate and mark the image of a three dimensional object is

a) Photography

b) Lexieography

c) Audiography

d) Holography

Question : 5

When a CD (Compact disc used in audio and video systems) is seen in Sunlight, rainbow-like colours is seen. This can be explained on the basis of the phenomenon of

a) Diffraction and transmission

b) Reflection and transmission

c) Reflection and diffraction

d) Refraction, diffraction and transmission

Question : 6

Yellow colour light is used as fog light because yellow colour

a) has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarity with red

b) light is most scattered by fog

c) has the longest wavelength among all colours

d) has the shortest wavelength among all colours