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 : 1

A compass which is allowed to move in a horizontal plane is taken to a geomagnetic pole. It

a) will stay in any position

b) will stay in north-south direction only

c) will stay in east-west direction only

d) None of these

Answer: (a)

At geomagnetic poles, there is no horizontal component of earth field and so compass needle may stay at any position.

Question : 2

Consider the following statements regarding electric fuse wire:

  1. It has low melting point.
  2. It has very high specific resistance.
  3. It is connected in parallel with the electric circuit.
Which of the statements given above is/are correct ?

a) 1 and 2

b) 1 only

c) 1 and 3

d) 2 and 3

Answer: (a)

An electric fuse wire should have low melting point and very high specific heat. Also it is connected in series with the electric circuit.

Question : 3 [BPSC (Pre) 1996]

If a bulb of 100 watt burns for 10 hours, the expenditure of electricity will be

a) 10 units

b) 0-1 unit

c) 1 unit

d) 100 units

Answer: (c)

Question : 4

Choke coil works on the principle of

a) self induction

b) mutual induction

c) transient current

d) wattless current

Answer: (a)

Question : 5

Consider the following statements :

  1. The strength of magnetic field of a permanent magnet decreases with the increase in temperature.
  2. A permanent magnet can be demagnetised by beating it.
  3. A charged particle moving parallel to direction of magnetic field experiences a force.
Which of the statements are correct ?

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Answer: (b)

According to $F↖{→}$ = qvB sin θ,

If angle between the direction of particle and magnetic field is 0° then  $F↖{→}$ = 0.

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