MDCAT-UHS Physics Unit-8

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This Test Include;
MDCAT-UHS Physics Unit-8
Topic: Electromagnetic induction
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Question#1: Eddy current losses are minimized in a transmission transformer by .

1 point

Using core of diamagnetic material

Laminating the core of transformer

Preventing the magnetic flux linkage between coils

Using coils of some insulting material

Clear selection

Question#2:Which statement about resistance of primary and secondary coil is correct?

1 point

Resistance of both coils should be kept maximum

Resistance of primary should be large as compared to secondary

Resistance of primary should be kept minimum

Resistance of Primary should be small as compared to secondary

Clear selection

Question#3: Multi-tapped transformer is used in receiver circuit of

1 point

Door Bell

Dish Antenna

Satellites

TV & Radio

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Question#4: Lenz’s law is according to law of conservation of

1 point

Energy

Magnetism

Magnetic flux

Mass

Clear selection

Question#5: A transformer cannot be used to step up .

1 point

Voltage

Power only

Energy only

Power & Energy

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Question#6: Back emf in a motor with the increase in speed of motor.

1 point

Decreases

Remains constant

Increases

Becomes zero

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Question#7: Winding of electromagnet are in with armature coils.

1 point

Series or parallel

Series

Parallel

Y-Configuration

Clear selection

Question#8: Principle of electric generator is based on .

1 point

Faraday’s law of electromagnetic induction

Ampere circuital law

Lenz’s law of induced emf

Gauss’s law for static charges

Clear selection

Question#9: The introductions of iron as a core inside a coil_______ magnetic flux and_______ inductance.

1 point

Decreases, Increases

Decreases, Decreases

Increases, Increases

Increases, Decreases

Clear selection

Question#10: The induced emf is associated with .

1 point

Rate of change of position of coil

Rate of change of induced current

Rate of change of electric flux

Rate of change of magnetic flux

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Question#11: When a conductor is kept moving in an external magnetic field, an induced emf hence an induced current is produced in it. This phenomenon is called .

1 point

Electric discharge

Electromagnetic induction

Magnetic induction

Commutation

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Question#12: A transformer is an example of .

1 point

Active two-port network

Active one-port network

Passive one-port network

Passive two-port network

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Question#13: Oersted discovered the magnetic effect of current. The reverse was observation was done by .

1 point

Ampere

Micheal Faraday

Joseph Henry

Both B & C

Clear selection

Question#14: Root mean square value of sinusoidal AC voltage is 1.41 V. Its peak to peak value is .

1 point

2 V

2.82 V

1.41 V

1 V

Clear selection

Question#15:The permeability of is highest.

1 point

Iron

Steel

PVC

Steel

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Question#16: Angular frequency of AC cycle is 4π rad s-1. Its time period will be .

1 point

2 s

0.5 s

1 s

4 s

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Question#17: If peak value of AC cycle is 9 V. Its average value will be .

1 point

9 V

18 V

0 V

6.5 V

Clear selection

Question#18:

1 point

t = T

t = T / 2

t = T / 4

t = 3 T / 4

Clear selection

Question#19:

1 point

800 V

80 V

8 V

0.8 V

Clear selection

Question#20:

1 point

0.01

100

10000

Clear selection

Question#21:

1 point

5 A

1 A

0.2 A

0 A

Clear selection

Question#22: Flux through a rectangular sheet of 1 cm x 1 cm will be _____________Wb if plane of sheet is held parallel to a uniform magnetic field of 300 T.

1 point

300

Clear selection

Question#23:Magnetic flux is actually .

1 point

Number of magnetic field lines passing perpendicularly through unit area

Number of magnetic field lines passing obliquely through unit area

Number of magnetic field lines passing through any area

Number of magnetic field lines passing through any cross section obliquely

Clear selection

Question#24: Magnetic flux is a _______quantity.

1 point

Vector

Scalar

Tensor

Multivalued

Clear selection

Question#25: Faraday’s law of electromagnetic induction is not a fundamental operating principle for .

1 point

Inductors and solenoids

Transformers

Generators and motors

Capacitors

Clear selection

Question#26: The electromotive force around a closed path is equal to the negative of the time rate of change of the magnetic flux enclosed by the path.

1 point

Faraday’s law

Hook’s law

Helmholtz law

Lenz’s law

Clear selection

Question#27: Lenz’s law is a qualitative law stating about directions of induced current but not about its magnitude at all.

1 point

True for closed loop geometries

True for open paths

False

True

Clear selection

Question#28: There is no induced emf as long as .

1 point

Area of loop is constant

Plane of loop is held perpendicular to B-field

Magnetic flux is not changing

Magnetic field is uniform

Clear selection

Question#29: Magnetic flux changes at a rate of 3 mWb/µs through a circular loop of 3 turns. Induced emf is .

1 point

9 kV

Zero

3 kV

1 mV

Clear selection

Question#30:Induced emf is .

1 point

Either AC or DC

Always DC

Always fluctuating

Always AC

Clear selection

Question#31: How can we increase the induced emf in a circular loop rotating in a uniform magnetic field?

1 point

By decreasing the speed of rotation

By reducing the magnetic field strength

By increasing the magnetic field strength

By decreasing the area of cross section

Clear selection

Question#32: Can a DC source produce AC in a resistive?

1 point

Sometimes true

Sometimes false

Always

Never

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Question#33: An AC source is always represented by its value.

1 point

Peak to peak

Average

Peak

Root mean square

Clear selection

Question#34:

1 point

Option 1

Option 2

Option 3

Option 4

Clear selection

Question#35:

1 point

1 : 4

1 : 1

1 : 2

2 : 1

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Question#36: . If a primary cell of emf 3 V is applied across primary coil of an ideal transformer capable of handling 12 mW with turns ratio 1:2, the output current is________________if transformer can provide a maximum load current of 2 mA.

1 point

1 mA

3 mA

4 mA

Zero

Clear selection

Question#37: An AC source with V = 30 sin (300t) V can produce rms current of A in a unit load.

1 point

21.3

Clear selection

Question#38:The average value of I = 300 sin (300πt + π) mA will be

1 point

Zero

213

300

600

Clear selection

Question#39: Frequency of AC source V = 2 sin (200πt) V is .

1 point

200π

200 Hz

50 Hz

100 Hz

Clear selection

Question#40:

1 point

V = 0 V

V = 14.1 sin (100πt) V

14.1 sin (50t) V

10 sin (100πt) V

Clear selection

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