set 5 MCQ Questions & Answers Detailed Explanation

Question : 1

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

Question : 2

Choke coil works on the principle of

a) self induction

b) mutual induction

c) transient current

d) wattless current

Question : 3

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.

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3

Question : 4

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