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

Question : 16 [IAS Prelim]

What is the order of magnitude of electric resistance of the human body (dry) ?

a) 10_{6 ohm}

b) 10² ohm

c) 10⁴ ohm

d) 10⁸ ohm

Question : 17

Zener diode is used as

a) full wave rectifier

b) A.C. voltage stabilizer

c) half wave rectifier

d) D.C. voltage stabilizer

Question : 18

The current in a generator armature is AC because

a) the current in the field coils is AC

b) the rotation of the armature causes the field through it to reverse

c) the magnetic field reverses at intervals

d) the commutator feeds current into it in opposite directions at every half cycle

Question : 19

A voltmeter essentially consists of

a) a low resistance, in series with a galvanometer

b) a high resistance in parallel with a galvanometer

c) a high resistance, in series with a galvanometer

d) a low resistance in parallel with a galvanometer

Question : 20

The force which makes maglev move

a) nuclear forces

b) gravitational field

c) magnetic field

d) air drag