NCERT Class 12/MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction Sample Test,Sample questions

Question:
A choke is used as a resistance in :

1.dc circuits

2.ac circuits

3.both ac and dc circuits

4.neither (a) nor (b)


Question:
A metal conductor of length 1 m rotates vertically about one of its ends at angular velocity 5 rad s-1 . If the horizontal component of earth’s magnetism is 2 × 10-5 T, then e.m.f. developed between the two ends of the conductor is:

1. 5 µV

2. 50 µV

3. 5 mV

4.50 mV


Question:
A transformer is used to light 100 W and 110 V lamp from a 220 V mains. If the main current is 0.5 A. Then the efficiency of the transformer is:

1.11%

2.50%

3.80%

4.90%


Question:
An e– and a p– are moving parallel to each other in a magnetic field. The magnetic force acting on the p+ is:

1.1840 times that on e–

2. less than that of e–

3.same as that of e–

4.slightly more than that of e–


Question:
coil of L = 8.4 mH and R = 6 Ω is connected to a 12 V battery. The current in the coil is 1.0 A at approx’time of:

1.500 s

2.20 s

3.35 ms

4.1 ms


Question:
For purely capacitive circuits, power factor is:

1.0

2.-1

3.1

4.infinity


Question:
If I current is flowing inductance L, then the dimension of 32 LI² is equivalent to:

1.charge

2.force

3.momentum

4.energy


Question:
If the magnetic flux linked with a coil through which a current off ampere is set up is ∅, then the coefficient of self-inductance of the coil is:

1.l/∅

2.∅/l

3.∅l

4.None of the above


Question:
The core of a transformer is laminated because:

1.rusting of core may be prevented

2.ratio of voltage in primary and secondary may be increased.

3.energy losses due to eddy current may be minimised

4.The weight of transformer may be reduced


Question:
The coupling co-efficient of the perfectly coupled coils is:

1.Zero

2.1

3. slightly more than 1

4.infinite


Question:
The energy stored in a 50 mH inductor carrying a current of 4 A is:

1.0.1 J

2.0.4 J

3.0.04 J

4.0.01 J


Question:
The flux linked with a coif at any instant t is given by ∅ = 10t² – 50t + 250. The induced emf at t = 35 is:

1.10 V

2.190 V

3.-190

4.-10 V


Question:
The magnetic field is parallel to a surface, then the magnetic flux through the surface is :

1. zero

2.small but not zero

3.infinite

4.large but not infinite


Question:
The magnetic flux (∅) lined with a coil is related to its area (s) as:

1.∅ ∝ s

2.∅ ∝ s²

3.∅ ∝ s1/2

4.∅ ∝ s-1/2


Question:
The magnetic flux (∅) linked with a coil is related to the number of turns (N) ofthe coil as:

1.f ∝ N

2.f ∝ N-1

3.f ∝ N2

4. f ∝ N-2


Question:
The magnetic flux linked with a coil is inversely proportional to the?

1. magnetic field

2.area of cross section

3.number of turns

4.None of the above


Question:
The phase difference between the flux linkage and the emf in a rotating coil in a uniform magnetic field is:

1.zero

2.π/2

3.π/4

4.π


Question:
The role of inductance is equivalent to:

1.inertia

2.force

3.energy

4.momentum


Question:
The SI unit of magnetic flux is:

1.T

2.Tn-2

3.Wb

4.Wb m-2


Question:
Two coils of self inductance 2 mil and 8 mil are placed so close together that the effective flux in one coil is completely linked with other. The mutual inductance between these coils is :

1.4 mH

2.16 mH

3.10 mH

4.6 mH


Question:
When the magnetic field is parallel to a surface, then the magnetic flux through the surface is:

1.infinite

2.zero

3. small but not zero

4.large but not infinite.


More MCQS

  1. NCERT Societal Impact MCQ
  2. MCQ Questions for Class 12 Maths Chapter 1 Relations and Functions
  3. MCQ Questions for Class 12 Physics Chapter 1 Electric Charges and Field
  4. MCQ Questions for Class 12 Physics Chapter 2 Electrostatic Potential and Capacitance
  5. Current Electricity Class 12 MCQs Questions
  6. MCQ Questions for Class 12 Physics Chapter 4 Moving Charges and Magnetism
  7. MCQ Questions for Class 12 Physics Chapter 5 Magnetism and Matter
  8. MCQ Questions for Class 12 Physics Chapter 6 Electromagnetic Induction
  9. MCQ Questions for Class 12 Physics Chapter 7 Alternating Current
  10. MCQ Questions for Class 12 Physics Chapter 8 Electromagnetic Waves
  11. MCQ Questions for Class 12 Physics Chapter 9 Ray Optics and Optical Instruments
  12. MCQ Questions for Class 12 Physics Chapter 10 Wave Optics
  13. MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter
  14. MCQ Questions for Class 12 Physics Chapter 12 Atoms
  15. MCQ Questions for Class 12 Physics Chapter 13 Nuclei
  16. MCQ Questions for Class 12 Physics Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits
  17. MCQ Questions for Class 12 Physics Chapter 15 Communication Systems
  18. MCQ Questions for Class 12 English
  19. MCQ Questions for Class 12 English Flamingo Chapter 3 Deep Water
  20. MCQ Questions for Class 12 English Flamingo Chapter 4 The Rattrap
  21. Human Geography: Nature and Scope Class 12 MCQs Questions
  22. MCQ Questions for Class 12 Geography Chapter 2 The World Population: Distribution, Density and Growth
Search
R4R Team
R4Rin Top Tutorials are Core Java,Hibernate ,Spring,Sturts.The content on R4R.in website is done by expert team not only with the help of books but along with the strong professional knowledge in all context like coding,designing, marketing,etc!