# IIT JEE/IIT JEE Electromagnetic Induction Electromagnetic Waves Part-1 Sample Test,Sample questions

1.75V

2.150V

3.100V

4.none of these

1.1

2.0.05

3.0.1

4.0.5

## Question: ```A choke coil is preferred to a rheostat in AC circuit then: ```

1.it consumes almost zero power

2.it increases current

3.it increases power

4.it increases voltage

1.zero

2.E/R

3.nE/R

4.E/nR

## Question: ```A coil is rotated in a uniform magnetic field about an axis perpendicular to the field. The emf induced in the coil would be maximum when the plane of coil is: ```

1.parallel to field

2.perpendicular to field

3.at 450C to field

4.none of these

1.6

2.12

3.8

4.16

1.155s

2.0.755s

3.0.155s

4.1.48s

1.375 mH

2.527 mH

3.675 mH

4.none of these

## Question: ```A copper plate flat pendulum and a copper plate pendulum with slots in it but of same dimension are made to oscillate in a magnetic field. Then ```

1.both will show damping at the same rate

4.there will be no damping

## Question: ```A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis then: ```

1.a current will be induced in the coil

2.no current will be induced in the coil

3.an emf and a current both will be induced in the coil

4.none of these

## Question: ```A cylindrical magnet is kept along the axis of a circular coil In rotating the magnet about its axis the coil will have induced in it ```

1.current

2.no current

3.only an e. m. f.

4.both e. m. f. and current

1.75V

2.125V

3.300V

4.1875V

1.5 kW

2.10 kW

3.15 kW

4.20 kW

## Question: ```A motor ```

1.converts electrical energy into mechanical energy

2.converts mechanical energy into electrical energy

3.converts electrical energy into magnetic energy

4.produces mechanical energy

1.64.7 V/m

2.57.8 V/m

3.56.72 V/m

4.54.77 V/m

1.400

2.200

3.500

4.300

1.50 V

2.132 V

3.148V

4.196V

1.25

2.150

3.1500

4.500

1.28.5 A

2.40 A

3.20 A

4.80 A

## Question: ```According to Faradays law the total charge induced in a conductor that is moved in a magnetic field depends upon: ```

1.initial magnetic flux

2.final magnetic flux

3.rate of change of magnetic flux

4.change in magnetic flux

1.120.08 W

2.109.97 W

3.100.08 W

4.98.08 W

1.100 km

2.200 km

3.300

4.400 km

## Question: ```An inductance has a high resistance to AC and low to DC. When a DC voltage source having same AC component superimposed on it sends current through an inductance to a load resistance: ```

1.the DC voltage falls appreciably across the AC component falls only a small amount

2.the AC and DC voltages fall by the same small percentage

3.the AC voltage falls appreciably across the load and DC voltage falls by only a small amount

4.both AC and DC voltage fall to nearly zero

1.50 Hz

2.110 Hz

3.60 Hz

4.230 Hz

1.+ 1 V

2.2 V

3.- 1 V

4.- 2 V

1.polarization

2.interference

3.reflection

4.diffraction

1.180v

2.200v

3.220v

4.none of these

1.zero

2.20 V

3.10 V

4.none of these

1.0.005 V

2.0.5 V

3.0.05 V

4.5 V

1.0.5 H

2.5 H

3.1.5 H

4.10 H

1.30 V

2.5 V

3.zero

4.2.5 V

1.zero

2.infinite

3.10A

4.5A

## Question: ```In a step-up transformer the number of turns in: ```

1.primary are less

2.primary are more

3.primary and secondary are equal

4.primary are infinite

## Question: ```In an electromagnetic wave the average energy density is associated to: ```

1.electric field only

2.magnetic field only

3.equally with electric and magnetic fields

4.average energy density is zero

1.4L

2.2L

3.L/2

4.L/4

1.LR

2.R/L

3.L/R

4.1/LR

1.LR

2.R / L

3.L / R

4.1 / LR

1.3.0 V

2.0.75 V

3.1.5 V

4.zero

1.Ohm

2.A-F

3.Ohm-m

4.sec

## Question: ```In the case of dc motor if the current flowing through the armature coil minimum induced emf is ```

1.zero

2.maximum

3.one half of maximum

4.one fourth of maximum

## Question: ```Induction coil is based on the principle of ```

1.rheostate

2.self induction

3.mutual induction

4.induction

## Question: ```Iron core chokes are used for reducing low frequency ac because ```

1.iron core is good.

2.Iron core has low permeability

3.With iron core self inductance increases

4.none of these

1.0.052 H

2.2.42 H

3.16.2 H

4.16.2 mH

1.ohms

2.amperes

3.volt

4.henry

1.switched on

2.switched off

4.fluctuating

## Question: ```The conduction current is same as displacement current when source is: ```

1.AC only

2.DC only

3.both AC or DC

4.neither DC nor AC

## Question: ```The core of any transformer is laminated so as to: ```

1.reduce the energy loss due to eddy currents

2.make it light weight

3.make it robust and strong

4.increase the secondary voltage

## Question: ```The correct sequence of the increasing wavelength of the given radiation sources is: ```

1.radioactive sources X-ray tube crystal oscillator sodium vapour lamp

4.X-ray tube crystal oscillator radioactive source sodium vapour lamp

1.1 amp

2.0.1 amp

3.0.2 amp

4.0.01 amp

1.Maxwell

2.Hertz

3.Marconi

4.J.C. Bose

1.50 Hz

2.60 Hz

3.55 Hz

4.65 Hz

## Question: ```The induced e. m. f. in a coil rotating in a uniform magnetic field depends upon ```

1.only on total number of turns in the coil.

2.Only on magnetic field

3.Area of coil and speed of rotation

4.All of the above

1.zero

2.1.5 T

3.15 T

4.0.15 T

## Question: ```The nature of electric field in the region between the two plates of a capacitor while charging is: ```

1.always constant

2.varying

3.depends on value of C and R

4.depends on emf of battery

1.zero

2.infinity

3.1?

4.none of these

1.480 kHz

2.503 kHz

3.460 kHz

4.607 kHz

1.1/CR

2.C/R

3.CR

4.R/C

## Question: ```The voltage of domestic AC is 200 V. What does this represent? ```

1.Mean voltage

2.Peak voltage

3.Root mean voltage

4.Root mean square voltage

1.L

2.2L

3.L/2

4.L/4

1.44.17 mH

2.48.98 mH

3.34.34 mH

4.36.73 mH

## Question: ```When a coil moves towards a stationary magnet the induced emf does not depend upon ```

1.number of turns strength of magnet

2.strength of magnet

3.speed with which the coil is moved

4.resistance of the coil

1.0.1 H

2.0.2 H

3.0.4 H

4.0.8 H

## Question: ```When the current through a solenoid increases at a constant rate the induced current: ```

1.is a constant and in the direction of inducing current

2.is a constant and is opposite to the direction of inducing current

3.increases with time and is in the direction of inducing current

4.increases with time and is opposite to the direction of inducing current

## Question: ```When the speed of the coil of generator is increased ```

1.the induced emf decreases but frequency increases.

2.the induced emf increases but frequency decreases

3.the induced emf increases and frequency also increases

4.both emf and frequency remain same

1.50 A DC

2.50 A 50 Hz AC

3.50 A 500 Hz AC

4.100 A DC

## More MCQS

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