Punjab 12th Class Physics Chapter 4 Electromagnetic Induction Mcqs Test Online

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Question 1 of 9

Physics

1. The induced emf in a coil is proportional to:

1.Tate of change of magnetic flux through the coil

2.Magnetic flux through the coil

3.Product of magnetic flux and area of the coil

4.Area of the coil

Question 1 of 9

Question 2 of 9

2. What is the coefficient of mutual inductance, when the magnetic flux changes by 2 x 10⁻² Wb, and change in current is 0.01 A?

1.3H

2.Zero

3.½ H

4.2H

Question 2 of 9

Question 3 of 9

3. The north pole of a magnet is brought near a metallic ring as shown in the fig. The direction of induced current in the ring will be:

1.Clockwise

2.First clockwise and then anti-clockwise

3.Fist anti-clockwise and then clockwise

4.Anticlockwise

Question 3 of 9

Question 4 of 9

4. Eddy current is produced when:

1.A metal is kept in varying magnetic field

2.A metal kept in steady magnetic field

3.A current is passed through a circular coil

4.A circular coil is placed in a steady magnetic field

Question 4 of 9

Question 5 of 9

5. Step-up transformer has a transformation ratio of 3.2. What is the voltage in secondary, if voltage in primary is 30 V?

1.15 V

2.45 V

3.300 V

4.90 V

Question 5 of 9

Question 6 of 9

6. The device in which induced emf is statically induced emf is:

1.Ac generator

2.Transformer

3.Dynamo

4.Alternator

Question 6 of 9

Question 7 of 9

7. For inducing emf in a coil the basic requirement is that:

1.Change in flux should link the coil

2.Coil should form a closed loop

3.Flux should link the coil

4.Both (b) and (c) are true

Question 7 of 9

Question 8 of 9

8. Which of the following quantities remain constant in step up transformer?

1.Current

2.Heat

3.Voltage

4.Power

Question 8 of 9

Question 9 of 9

9. In a coil current change from 2 to 4 A in 0.5 s. If the average induced emf is 8V hen coefficient of self-inductance is:

1.0.04 henry

2.0.2 henry

3.0.8 henry

4.0.1 henry

Question 9 of 9

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