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:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


Question:
Eddy currents are also known as

1.Focault currents

2.Faraday currents

3.Huygen currents

4.Franklin currents

Posted Date:-2021-09-25 23:14:56


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

1.galvanometer

2.pyrometer

3.pyrometer

4.generator

Posted Date:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


Question:
L / R has the dimensions ofhenrytime

1.mass

2.length

3.henry

4.time

Posted Date:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


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

1.mass

2.energy

3.momentum

4.charge

Posted Date:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


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

4.is made oscillatory

Posted Date:-2021-09-25 23:14:56


Question:
The frequency of ac in India is

1.50 Hz

2.50 kHz

3.1420 MHz

4.60 kHz

Posted Date:-2021-09-25 23:14:56


Question:
The laws of electromagnetic induction are the contribution of

1.Faraday

2.Maxwell

3.Lawrence

4.Hall

Posted Date:-2021-09-25 23:14:56


Question:
The principle of eddy currents is used in

1.galvanometer

2.speedometer

3.pyrometer

4.barometer

Posted Date:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


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

1.Maxwell

2.Tesla

3.Weber

4.Henry

Posted Date:-2021-09-25 23:14:56


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:-2021-09-25 23:14:56


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