set 8 MCQ Questions & Answers Detailed Explanation

Question : 1

The ratio of the focal length of the objective to the focal length of the eyepiece is greater than one for

a) both microscope and telescope

b) a microscope

c) a telescope

d) neither microscope nor telescope

Question : 2

Some pairs of devices and associated energy changes are given below.

1. Electric generator - Mechanical to electrical
2. Electric motor - Electrical to mechanical
3. Diesel engine - Light to electrical
4. Solar cell - Chemical to mechanical

a) 2 and 4

b) 1 and 2

c) 1 and 3

d) 3 and 4

Question : 3

When an optician prescribes a – 5D lens, what does it mean?

a) Concave lens of 5 cm focal length

b) Concave lens of 20 cm focal length

c) Convex lens of 5 cm focal length

d) Convex lens of 5 cm focal length

Question : 4

A piece of copper and another of germanium are cooled from room temperature to 80 K. The resistance of

a) each of them decreases

b) copper increases and germanium decreases

c) each of them increases

d) copper decreases and germanium increases

Question : 5

Full form of C.F.L. is

a) Chemical Fluorescent Lamp

b) Compact Fluorescent Lamp

c) Centrally Fixed Lamp

d) Condensed Fluorescent Lamp

Question : 6

The electric current does not flow between two properly connected charged bodies if they are having

a) Same resistivity

b) Same charge

c) Same capacity

d) Same potential