electric current and magnetism - Category wise Question and Answer Practice Test with Solutions

Question : 16 [RAS/RTS (Pre) 1994]

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 : 17

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 : 18 [UPPCS (Pre) 2016]

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 : 19

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 : 20 [IAS Prelim]

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