# 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)

1. 5 ÂµV

2. 50 ÂµV

3. 5 mV

4.50 mV

1.11%

2.50%

3.80%

4.90%

## Question: `An eâ€“ and a pâ€“ are moving parallel to each other in a magnetic field. The magnetic force acting on the p+ is:`

1.1840 times that on eâ€“

2. less than that of eâ€“

3.same as that of eâ€“

4.slightly more than that of eâ€“

1.500 s

2.20 s

3.35 ms

4.1 ms

1.0

2.-1

3.1

4.infinity

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 âˆ…, then the coefficient of self-inductance of the coil is:`

1.l/âˆ…

2.âˆ…/l

3.âˆ…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

1.0.1 J

2.0.4 J

3.0.04 J

4.0.01 J

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

1.âˆ… âˆ s

2.âˆ… âˆ sÂ²

3.âˆ… âˆ s1/2

4.âˆ… âˆ s-1/2

1.f âˆ N

2.f âˆ N-1

3.f âˆ N2

4. f âˆ 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

1.zero

2.Ï€/2

3.Ï€/4

4.Ï€

1.inertia

2.force

3.energy

4.momentum

1.T

2.Tn-2

3.Wb

4.Wb m-2

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

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