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

Question : 11

An alternating current can be converted into direct current by a

a) transformer

b) dynamo

c) rectifier

d) motor

Question : 12

The energy band gap is minimum in

a) superconductors

b) insulators

c) metals

d) semiconductors.

Question : 13

In an electric motor, conversion takes place of

a) electrical energy into mechanical energy

b) electrical energy into light energy

c) chemical energy into electrical energy

d) electrical energy into chemical energy

Question : 14 [RAS/RTS (Pre) 1999]

The filament of a halogen lamp is an alloy of

a) Tungsten and sodium

b) Tungsten and iodine

c) Tungsten and bromine

d) Molybdenum and sodium

Question : 15

Match list-I with list -II:

a) A – 4 ; B – 3 ; C – 2 ; D – 1

b) A – 3 ; B – 1 ; C – 2 ; D – 4

c) A – 4 ; B – 2 ; C – 3 ; D – 1

d) A – 2 ; B – 3 ; C – 1 ; D – 4