set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

Match the Column - I and Column - II.

a) A-Q; B-P; C-S; D-R

b) A-P; B-Q; C-S; D-R

c) A-P; B-Q; C-R; D-S

d) A-Q; B-P; C-R; D-S

Question : 2

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 : 3

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 : 4

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 : 5

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

Question : 6

For dynamo which one of the following statements is correct?

a) It converts the kinetic energy into heat energy

b) It converts the mechanical energy into electrical energy

c) It converts the electrical energy into light energy

d) It converts the electrical energy into mechanical energy