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Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 18 (25 MCQs)

Quiz Instructions

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1. The unit of inductance is:
2. A motor converts electrical current into:mechanical energy/force
3. An aircraft wingspan is 25m long. It passes through a magnetic field of strength 1.5T at a speed of 50m/s. What is the e.m.f induced on the wings to 2 significant figures?
4. What is the SI unit of magnetic flux linkage?
5. Who discovered electromagnetic induction?
6. What is the symbol for Inductance?
7. A flat coil consists of 20 turns each of area an area of 50 cm2, is positioned perpendicularly to a uniform magnetic field that increases its magnitude at a constant rate from 2.0 T to 6.0 T in 2.0 s. If the coil has a total resistance of 0.40 ohms, what is the magnitude of the induced current?
8. Two electromagnets contain the same types of magnets and wires. But the magnet in the first moves much faster than the second. Therefore:
9. What happens to the secondary coil in mutual induction?
10. The direction of induced current is determine by using
11. What do you notice about the direction of the current as the wire crosses the midpoint?
12. What cause-and-effect statement best describes what happens in a generator?
13. What is one way to increase the current in a wire?
14. Transformers are used in the transmission of electrical power to houses. Which type of transformer is used at the power station prior to connection to the power lines and which type is used prior to delivery to the houses?
15. Which cause-and-effect statement best describes what happens in a motor?
16. What is necessary to generate a current in addition to a potential difference?
17. An alternating current I in ampere varies with time t in second according to the equation I = 5 sin 314 t. What is the mean power developed by the current in a resistive load of 10W and frequency of a.c. supply?
18. A current produced by an induced e.m.f. is called?
19. You have a coil of wire. You take a bar magnet and pull its North pole away from the coil. According to Lenz's Law, the face of the coil closest to the magnet will .....
20. A circular loop of flexible conducting material is kept in a magnetic field directed perpendicularly into its plane.By holding the loop at diametrically opposite points its is suddenly stretched outwards, then
21. In A.C generator, by increasing the no. of turns in the coil,
22. Which rule is used to determine the direction of force when a current-carrying conductor is in the magnetic field.
23. Why is permanent magnet able to exert a force on an electric charge?
24. The radius of a circular coil having 50 turns is 2 cm. Its plane is normal to the magnetic field. The magnetic field changes from 2T to 4T in 3.14 sec. The induced emf in coil will be:-
25. A coil of wire is placed in a changing magnetic field. What is induced in the coil?
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