12th physics chapter 6 Bihar board with NCERT-Details & Highlights
| name of content | 12th physics chapter 6 full solution |
| content | physics objective type MCQ question with answer |
| name of subjects | class 12 physics |
| important for exam | Bihar board & other state board |
| pattern & Level | NCERT & State level question |
12th physics chapter 6 all objective solutions – download PDF
1. The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was
-
- (a) moving towards the solenoid
- (b) moving into the solenoid
- (c) at rest inside the solenoid
- (d) moving out of the solenoid
Answer: (d) moving out of the solenoid
2. Faraday’s laws are consequence of the conservation of
-
- (a) charge
- (b) energy
- (c) magnetic field
- (d) both (b) and (c)
Answer: (b) energy
3. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in
-
- (a) P increases while in Q decreases
- (b) Q increases while in P decreases
- (c) both P and Q increases
- (d) both P and Q decreases
Answer: (d) both P and Q decreases
4. Direction of current induced in a wire moving in a magnetic field is found using
-
- (a) Fleming’s left hand rule
- (b) Fleming’s right hand rule
- (c) Ampere’s rule
- (d) Right hand clasp rule
Answer: (b) Fleming’s right hand rule
5. Lenz’s law is a consequence of the law of conservation of
-
- (a) charge
- (b) energy
- (c) induced emf
- (d) induced current
Answer: (b) energy
6. A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, the current will
-
- (a) increase
- (b) decrease
- (c) remain same
- (d) first increase then decrease
Answer: (b) decrease
7. Which of the following statements is not correct?
-
- (a) Whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in circuit.
- (b) The induced emf lasts so long as the change in magnetic flux continues.
- (c) The direction of induced emf is given by Lenz’s law.
- (d) Lenz’s law is a consequence of the law of conservation of momentum.
Answer: (d) Lenz’s law is a consequence of the law of conservation of momentum.
8. There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then
-
- (a) current is induced in the loop in the anti-clockwise direction.
- (b) current is induced in the loop in the clockwise direction.
- (c) ac is induced in the loop.
- (d) no current is induced in the loop.
Answer: (a) current is induced in the loop in the anti-clockwise direction.
9. The north pole of a bar magnet is rapidly introduced into a solenoid at one end (say A). Which of the following statements correctly depicts the phenomenon taking place?
-
- (a) No induced emf is developed.
- (b) The end A of the solenoid behaves like a south pole.
- (c) The end A of the solenoid behaves like north pole.
- (d) The end A of the solenoid acquires positive potential.
Answer: (c) The end A of the solenoid behaves like north pole.
10. A metal plate can be heated by
-
- (a) passing either a direct or alternating current through the plate.
- (b) placing in a time varying magnetic field.
- (c) placing in a space varying magnetic field, but does not vary with time.
- (d) both (a) and (b) are correct.
Answer: (d) both (a) and (b) are correct.
11. Identify the wrong statement.
-
- (a) Eddy currents are produced in a steady magnetic field.
- (b) Eddy currents can be minimized by using laminated core.
- (c) Induction furnace uses eddy current to produce heat.
- (d) Eddy current can be used to produce braking force in moving trains.
Answer: (a) Eddy currents are produced in a steady magnetic field.
12. Which of the following does not use the application of eddy current?
-
- (a) Electric power meters
- (b) Induction furnace
- (c) LED lights
- (d) Magnetic brakes in trains
Answer: (c) LED lights
13. If number of turns in primary and secondary coils is increased to two times each, the mutual inductance
-
- (a) becomes 4 times
- (b) becomes 2 times
- (c) becomes A times
- (d) remains unchanged 4
Answer: (a) becomes 4 times
14. When the rate of change oic current is unity, the induced emf is equal to
-
- (a) thickness of coil
- (b) number of turns in coil
- (c) coefficient of self inductance
- (d) total flux linked with coil
Answer: (c) coefficient of self inductance
15. Two inductors of inductance .L each are connected in series with opposite? magnetic fluxes. The resultant inductance is (Ignore mutual inductance)
-
- (a) zero
- (b) L
- (c) 2L
- (d) 3L
Answer: (c) 2L
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Bihar board 12th science stream subjects wise solution
click here to check out Bihar board science stream all subjects solutions
| SL.N. | Subject name with solutions |
| 01 | Physics |
| 02 | Chemistry |
| 03 | Biology |
| 04 | Math |
| 05 | Hindi |
| 06 | English |