set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

The forbidden gap in the energy bands of germanium at room temperature is about

a) 0.1 eV

b) 0.67 eV

c) 1.1 eV

d) 6.7 eV

Question : 2

Consider the following statements regarding a motor car battery.

1. The voltage is usually 12V.
2. Electrolyte used is hydrochloric acid.
3. Electrodes are lead and copper.
4. Capacity is expressed in ampere-hour.

a) 3 and 4

b) 1 and 2

c) 2 and 3

d) 1 and 4

Question : 3

How many units of electricity will be consumed if you use a 60 watt electric bulb for 5 hours everyday for 30 days?

a) 6

b) 12

c) 9

d) 3

Question : 4

Conductivity increases in the order of

a) Al, Cu, Ag

b) Cu, Al, Ag

c) Al, Ag, Cu

d) Ag, Cu, Al

Question : 5

In an intrinsic semiconductor

a) both holes and electrons carry current

b) both holes and electrons carry current with electrons being majority carriers

c) only electrons are responsible for flow of current

d) only holes are responsible for flow of current

Question : 6

Assertion (A):
The temperature of a metal wire rises when an electric current is passed through it.
Reason (R):
Collision of metal atoms with each other releases heat energy.
Code

a) (A) is true, but (R) is false

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

c) Both (A) and (R) are true, but (R) is not the correct explanation of (A)

d) (A) is false, but (R) is true