# IIT JEE/IIT JEE Electromagnetic Induction Electromagnetic Waves Part 2 Sample Test,Sample questions

## Question: `A 20V ac is applied to a circuit consisting of a resistance and a coil with negligible resistance. If the voltage across the resistance is 12 V the voltage across the coil is10 V8 V6 V`

1.16 V

2.10 V

3.8 V

4.6 V

Posted Date:-2021-09-26 06:14:56

## Question: `A bar magnet falls through a metal ring. The acceleration will be`

1.equal to g

2.less than g

3.greater than g

4.zero

Posted Date:-2021-09-26 06:14:56

## Question: `A step down transformer reduces 200 V to 110 V. The primary draws 5 amp. of current and secondary supplies 9 ampere. The efficiency of transformer is90%80%60%70%`

1.90%

2.80%

3.60%

4.70%

Posted Date:-2021-09-26 06:14:56

## Question: `A transformer is used to light a 100W and 110 V lamp from a 230 V mains If the main current is 05 A the efficiency of the transformer is`

1.50%

2.20%

3.87%

4.67%

Posted Date:-2021-09-26 06:14:56

## Question: `An AC voltmeter reads 20 V across a resistor 30 V across an inductor and 15 V across a capacitor in LCR series circuit In this case the supply voltage will be`

1.100 V

2.60 V

3.50 V

4.25 V

Posted Date:-2021-09-26 06:14:56

## Question: `Eddy currents are also known as`

1.Focault currents

3.Huygen currents

4.Franklin currents

Posted Date:-2021-09-26 06:14:56

## Question: `Electromagnetic induction is the underlying phenomenon in the construction of`

1.galvanometer

2.pyrometer

3.pyrometer

4.generator

Posted Date:-2021-09-26 06:14:56

## Question: `If an e. m. f. of 300 micro volts is induced in a coil when current in it changes from 13 amperes to 7 amperes in 0.5 sec then the value of the self inductance of the coil will be25 micro henry20 micro henry27 micro henry`

1.25 micro henry

2.20 micro henry

3.27 micro henry

4.17 micro henry

Posted Date:-2021-09-26 06:14:56

## Question: `If in a galvanometer the coil is wound on a bad conductor the eddy current will be`

1.zero

2.maximum

3.minimum

4.50% of the actual value

Posted Date:-2021-09-26 06:14:56

## Question: `L / R has the dimensions ofhenrytime`

1.mass

2.length

3.henry

4.time

Posted Date:-2021-09-26 06:14:56

## Question: `Lenz s law gives the`

1.magnitude of induced e. m. f.

2.magnitude of induced current

3.direction of current/emf induced

4.None of these

Posted Date:-2021-09-26 06:14:56

## Question: `Lenzs law is a consequence of the law of conservation ofmassenergy`

1.mass

2.energy

3.momentum

4.charge

Posted Date:-2021-09-26 06:14:56

## Question: `The alternating voltage which we use in house has a peak value of nearly`

1.220 V

2.280 V

3.311 V

4.300 V

Posted Date:-2021-09-26 06:14:56

## Question: `The coil of a moving coil galvanometer is wound over metallic frames so that due to eddy currents the motion`

1.remains the same

2.is damped

3.undamped

Posted Date:-2021-09-26 06:14:56

## Question: `The frequency of ac in India is`

1.50 Hz

2.50 kHz

3.1420 MHz

4.60 kHz

Posted Date:-2021-09-26 06:14:56

## Question: `The laws of electromagnetic induction are the contribution of`

2.Maxwell

3.Lawrence

4.Hall

Posted Date:-2021-09-26 06:14:56

## Question: `The principle of eddy currents is used in`

1.galvanometer

2.speedometer

3.pyrometer

4.barometer

Posted Date:-2021-09-26 06:14:56

## Question: `The property of an electric circuit by virtue of which any change in the magnetic flux linked with it induces an e m f in it is called`

1.self-inductance

2.conductance

3.mutual induction

4.trans-conductance

Posted Date:-2021-09-26 06:14:56

## Question: `The S.I. unit of magnitude flux is`

1.Maxwell

2.Tesla

3.Weber

4.Henry

Posted Date:-2021-09-26 06:14:56

## Question: `When power is drawn from the secondary coil of the transformer the dynamic resistance`

1.remains same

2.decreases

3.increases

4.fluctuates.

Posted Date:-2021-09-26 06:14:56

## More MCQS

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