set 9 MCQ Questions & Answers Detailed Explanation

Question : 1

Parameters of electricity supply in India are

a) Potential Difference of 220 V, Frequency of 60 hertz and Current Rating of 15A

b) Potential Difference of 220 V, Frequency of 50 hertz and Current Rating of 5A/15A

c) Potential Difference of 150 V, Frequency of 40 hertz and Current Rating of 10 A

d) Potential Difference of 220 V, Frequency of 40 hertz and Current Rating of 5 A

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

On charging by conduction, mass of a body may

a) decreases

b) increase or decrease

c) increase

d) none of these

Question : 4

From a power station, the power is transmitted at a very high voltage because –

a) electricity at high voltage is less dangerous

b) it is generated only at high voltage

c) it is cheaper to produce electricity at high voltage

d) there is less loss of energy in transmission at high voltage

Question : 5

Alternate current is not preferable

a) To transmit electric power

b) To charge storage battery

c) To run/start an electric motor

d) To heat up electric toaster

Question : 6

Which one among the following is used to make periscope?

a) Plane mirror

b) Concave lens

c) Concave mirror

d) None of the above