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

Question : 16

At magnetic poles, the angle of dip is

a) zero

b) 45°

c) 30°

d) 90°

Question : 17 [BPSC (Pre) 2005]

When electrical energy is converted into motion

a) Heat loss is 30 percent

b) There is no heat loss

c) Heat loss is 50 percent

d) Heat loss is 80 percent

Question : 18

Consider the following statements :

1. An ammeter is always connected in series in the circuit.
2. A voltmeter can only be connected in series in the circuit.
3. A voltmeter has low resistance.

a) 1 only

b) 1 and 2

c) 2 and 3

d) 3 only

Question : 19

An electric motor is a device

a) That works on the principle described by Fleming’s left hand rule

b) That converts electrical energy to mechanical energy

c) Both (a) and (b)

d) Neither (a) nor (b)

Question : 20 [NDA]

A wire of resistance 16 W is bent in the form of a circle. What is the effective resistance between diametrically opposite points?

a) 4 W

b) 1 W

c) 2 W

d) 8 W