set 8 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

Full form of C.F.L. is

a) Chemical Fluorescent Lamp

b) Compact Fluorescent Lamp

c) Centrally Fixed Lamp

d) Condensed Fluorescent Lamp

Question : 3

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 : 4

A bulb and a capacitor are connected in series to a source of alternating current. If its frequency is increased, while keeping the voltage of the source constant, then bulb will

a) give less intense light

b) give light of same intensity before

c) give more intense light

d) stop radiating light

Question : 5

Assertion (A) :
A person stands at a distance of 1m in front of a concave mirror. If the radius of curvature of the mirror is 4m, the image of the person lies at a distance 2m behind the mirror.
Reason (R) :
The general mirror equation confirms the location of the image from the mirror and it could be a real image.

a) A is true but R is false

b) Both A and R are individually true and R is the correct explanation of A

c) Both A and R are individually true but R is NOT the correct explanation of A

d) A is false but R is true

Question : 6

Two wires have their lengths, diameters and resistivities all in the ratio of 1 : 2. If the resistance of the thinner wire is 10 ohm, the resistance of the thicker wire is

a) 20 ohm

b) 5 ohm

c) 10 ohm

d) 40 ohm