Class 12th Physics Chapter 6 Electromagnetic Induction VVI Objective Question
ELECTROMAGNETIC INDUCTION
1. Unit of self-induction is
(A) Weber Title
(B) Ohm
(C) Henry
(D) Gauss
| Answer:- C |
2. The direction of eddy current is obtained using
(A) Kirchhoff’s laws
(B) Lenz’s law
(C) Planck’s law
(D) none of these
| Answer:- B |
3. Lenz’s law is associated with
(A) charge
(B) mass
(C) energy
(D) principle of conservation of momentum
| Answer:- C |
4. The working of dynamo is based on the principle of
(A) heating effect of current
(B) electromagnetic induction
(C) magnetic induction
(D) electric induction
| Answer:- B |
5. Eddy current can provide
(A) retardation in speed
(B) heat
(C) separation of metals from non-metals
(D) all of these
| Answer:- D |
6. The S.I. unit of flux of magnetic field
(A) tesla
(B) henry
(C) weber
(D) joule-second
| Answer:- C |
7. The law governing electromagnetic induction is called
(A) Newton’s law
(B) Faraday’s law
(C) Ohm’s law
(D) Ampere’s law
| Answer:- B |
8. Lenz’s law is a consequence of the law of conservation of
(A) charge
(B) energy
(C) mass
(D) momentum
| Answer:- B |
9. “Volt is the unit of
(A) induced emf
(B) induced current
(C) potential difference
(D) both ‘A’ and ‘C’
| Answer:- D |
10. The principle on which the working of dynamo is based is
(A) heating effect of current
(B) electromagnetic induction
(C) induced magnetism
(D) induced electricity
| Answer:- B |
11. An inductor may store energy in its
(A) electric field
(B) coil
(C) magnetic field
(D) none of these
| Answer:- C |
12. The working of an induction coil is based on the principle of
(A) electric induction
(B) magnetic induction
(C) electromagnetic induction
(D) none of these
| Answer:- C |
13. An induction coil give
(A) a high voltage at high current
(B) a high voltage at low current
(C) a low voltage at high current
(D) a low voltage at low current
| Answer:- B |
14. A dynamo
(A) creates mechanical energy
(B) creates electrical energy
(C) converts mechanical energy to electrical energy
(D) converts electrical energy to mechanical energy
| Answer:- C |
15. An electric motor
(A) creates mechanical energy
(B) creates electrical energy
(C) converts mechanical energy to electrical energy
(D) converts electrical energy to mechanical energy
| Answer:- D |
16. Voltage is induced where there is a relative motion between a conductor and
(A) another conductor
(B) a magnetic field
(C) an electrostatic field
(D) None of these
| Answer:- B |
17. The e.m.f. produced in a wire by its motion across a magnetic field does not depend upon
(A) the length of the wire
(B) the diameter of the wire
(C) the composition of wire
(D) both ‘B’ and ‘C’
| Answer:- D |
18. The e.m.f. induced in a conductor that is moved in a magnetic field depends on the
(A) initial value
(B) final value
(C) total charge
(D) rate of change of the magnetic flux thrown conductor
| Answer:- D |
19. A magnet is dropped down a long vertical copper tube. The acceleration of the magnet will
(A) be zero after some time
(B) be the same through out
(C) increase to same value
(D) increase continuously
| Answer:- A |
20. Two inductors each of inductance ‘L’ are joined in parallel. Their equivalent inductance is
(A) 2L
(B) L/2
(C) L
(D) zero
| Answer:- B |
21. If an inductor having inductance L is joined to another identical inductor with its one end joined, the resultant inductance would become
(A) 2L
(B) L/2
(C) zero
(D) L/4
| Answer:- A |
22. If 100% flux of coil of inductance L1 is linked with the coil of inductance L2 then coefficient of coupling is
(A) unity
(B) infinity
(C) zero
(D) none of these
| Answer:- A |
23. The self inductance of a coil is 5 mH. If a current of 2 A is passed, the magnetic flux linked with the coil will be
(A) 1 Wb
(B) 0.1 Wb
(C) 0.01 Wb
(D) 0.001 Wb
| Answer:- C |
24. If there are N, and N, turns in the primary and seconday coils respectively in a step-down transformer, then
(A) N1 >N2
(B) N2>N1
(C) N1= N2
(D) N1= 0
| Answer:- A |
25. Transformer works in case of
(A) only d.c.
(B) only a.c.
(C) both a.c. and d.c.
(D) none of these
| Answer:- B |
26. The material most appropriate for core of a transformer is
(A) soft iron
(B) copper
(C) stainless steel
(D) alnico
| Answer:- A |
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