set 7 MCQ Questions & Answers Detailed Explanation

Question : 1

Electricity consumption bill is based on the measurement of

1. Watt
2. Voltage
3. Ohm
4. Ampere

a) 2 and 3

b) Only 1

c) 1 and 2

d) 1 and 4

Question : 2

Consider the following statements regarding a motor car battery:

1. The voltage is usually 12 V.
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

Given below are two statements, one labelled as Assertion (A) and the other labelled as Reason (R).
Assertion (A):
Transformer is useful for stepping up or stepping down voltages.
Reason (R):
Transformer is a device used in D.C. circuits.
In the context of the above two statements, which one of the following is correct?

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 : 4

Principle of fuse is

a) Heating effect of electricity

b) Chemical effect of electricity

c) Mechanical effect of electricity

d) Magnetic effect of electricity

Question : 5

Kilowatt-hour is the unit of

a) electric power

b) electrical energy

c) potential difference

d) charge

Question : 6

In an unbiased p-n junction, holes diffuse from the p-region to n-region because

a) they move across the junction by the potential difference.

b) hole concentration in p-region is more as compared to n-region.

c) free electrons in the n-region attract them.

d) all the above