set 14 MCQ Questions & Answers Detailed Explanation

Question : 1

An air bubble inside water behaves as a

a) Divergent lens

b) Convergent lens

c) Bifocal lens

d) Cylindrical lens

Question : 2

Total internal reflection can take place only if

a) the refractive indices of the two media are close to different

b) light goes from optically rarer medium to optically denser medium

c) light goes from optically denser medium to rarer medium

d) the refractive indices of the two media are widely different

Question : 3

Consider telecommunication through optical fibres. Which of the following statements is not true ?

a) Optical fibres may have homogeneous core with a suitable cladding

b) Optical fibres are subject to electromagnetic interference from outside

c) Optical fibres have extremely low transmission loss

d) Optical fibres can be of graded refractive index

Question : 4

Which of the following radiations has the highest energy per quantum?

a) 280-320 nm

b) 200-280 nm

c) 320-400 nm

d) 400-600 nm

Question : 5

An oscilloscope is an instrument which allows us to see waves produced by

a) X-rays

b) Visible light

c) Sound

d) Gamma rays

Question : 6

For seeing a cricket match, we prefer binoculars to the terrestrial telescope, because

a) to avoid chromatic aberration

b) binoculars give three-dimensional view

c) terrestrial telescope gives inverted image

d) to have larger magnification