set 9 MCQ Questions & Answers Detailed Explanation

Question : 1

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 : 2

On charging by conduction, mass of a body may

a) decreases

b) increase or decrease

c) increase

d) none of these

Question : 3

A wire with black insulation during electric supply is

a) Neutral wire

b) Live wire

c) Earth wire

d) Fuse wire

Question : 4

Dynamo is a machine which is used for

a) Conversion of mechanical energy to electrical energy

b) Conversion of high voltage to low voltage

c) Conversion of electrical energy to mechanical energy

d) Conversion of low voltage to high voltage

Question : 5

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 : 6

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