electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

Question : 21 [UPPSC (RI) 2014]

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

Question : 22 [UPPCS (Mains) 2015]

Full form of C.F.L. is

a) Chemical Fluorescent Lamp

b) Compact Fluorescent Lamp

c) Centrally Fixed Lamp

d) Condensed Fluorescent Lamp

Question : 23

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 : 24

In charging a battery of motor car, the following effect of electric current is used

a) heating

b) chemical

c) magnetic

d) induction

Question : 25 [NDA]

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