Punjab 12th Class Physics Chapter 4 Electromagnetic Induction Mcqs Test Online Punjab 12th Class Physics Chapter 4 Electromagnetic Induction Mcqs Test Online 123456789 Question 1 of 9Physics 1. The induced emf in a coil is proportional to: 1.Magnetic flux through the coil 2.Tate of change of magnetic flux through the coil 3.Product of magnetic flux and area of the coil 4.Area of the coil Question 1 of 9Question 2 of 9 2. 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: 1.0.2 henry 2.0.8 henry 3.0.1 henry 4.0.04 henry Question 2 of 9Question 3 of 9 3. 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 3 of 9Question 4 of 9 4. For inducing emf in a coil the basic requirement is that: 1.Coil should form a closed loop 2.Flux should link the coil 3.Both (b) and (c) are true 4.Change in flux should link the coil Question 4 of 9Question 5 of 9 5. 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? 1.2H 2.3H 3.½ H 4.Zero Question 5 of 9Question 6 of 9 6. Eddy current is produced when: 1.A metal is kept in varying magnetic field 2.A circular coil is placed in a steady magnetic field 3.A current is passed through a circular coil4.A metal kept in steady magnetic field Question 6 of 9Question 7 of 9 7. Which of the following quantities remain constant in step up transformer? 1.Current 2.Voltage 3.Power 4.HeatQuestion 7 of 9Question 8 of 9 8. 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.Fist anti-clockwise and then clockwise 2.First clockwise and then anti-clockwise 3.Clockwise 4.Anticlockwise Question 8 of 9Question 9 of 9 9. The device in which induced emf is statically induced emf is: 1.Alternator 2.Transformer 3.Dynamo 4.Ac generator Question 9 of 9 Loading... Test By Subject Punjab Test By Topics 12th Class Physics You Can Learn and Gain more Knowledge through our Online Quiz and Testing system Just Search your desired Preparation subject at Gotest.