Electric Current And Magnetism - Category Wise Question And Answer Practice Test With Solutions

ELECTRIC CURRENT AND MAGNETISM PRACTICE TEST [9 - EXERCISES]

Set 1

Set 2

Set 3

Set 4

Set 5

Set 6

Set 7

Set 8

Set 9

Question : 16

At magnetic poles, the angle of dip is

a) zero

b) 45°

c) 30°

d) 90°

Answer: (d)

At poles, δ = 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

Answer: (b)

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.
Which of these statements) is/are correct?

a) 1 only

b) 1 and 2

c) 2 and 3

d) 3 only

Answer: (a)

If you connected a voltmeter in series all you are doing is measuring the difference in potential across a strand of wire which will be zero (or very near).

To measure voltage you connect the voltmeter in parallel so that you measure the voltage from the – to the + or the voltage drop across a load.

For a voltmeter the higher the resistance the more accurate it is.

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)

Answer: (c)

An electric motor is a device that converts electrical energy to mechanical energy.

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

Answer: (a)

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