set 2 MCQ Questions & Answers Detailed Explanation

Question : 1

A device which converts electrical energy into mechanical energy is

a) Electric motor

b) Dynamo

c) Transformer

d) Inductor

Question : 2

Earth’s magnetic field always has a horizontal component except at

a) geographical north pole

b) magnetic equator

c) magnetic pole

d) at an altitude of 45°

Question : 3

To shield an instrument from external magnetic field, it is placed inside a cabin made from

a) iron

b) wood

c) ebonite

d) diamagnetic substance

Question : 4

If the electrical resistance of a typical substance suddenly drops to zero then the substance is called

a) conductor

b) superconductor

c) semiconductor

d) insulator

Question : 5

In a common base amplifier the phase difference between the input signal voltage and the output voltage is

a) π/4

b) π/2

c) 0

d) π

Question : 6

Magnetism of a bar magnet can be destroyed if it is

1. kept in the magnetic meridian.
2. placed in a direction opposite to that of the Earth's horizontal intensity.
3. heated to a temperature known as Curie temperature.

a) II and III only

b) I and III only

c) II only

d) I, II and III