Question # 1

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

Self inductance of a long solenoid is given by

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None of the above

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

In A.C. inductor behaves as

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Capacitor

Resistor

Commutator

Transistor

Transformer is used to change

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Electric power

Magnetic field

Alternating voltage

Phase of A.C.

Energy density in an inductor is.

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Directly proportional to magnetic field

Directly proportional to square of magnetic field

Inversely proportional to magnetic field

Inversely proportional to square of magnetic field

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

When the back emf in a current is zero, it draws

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Zero current

Maximum current

Minimum current

Steady average current

A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30^o with 0.5 T magnetic field . The emf produced is.

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0.25 N

2.5 N

0.25 V

2.5 V

The device in the circuit that consume electrical energy are known as.

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Dissipaters

Generator

Load

Motors

split rings are used in

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A.C. generator

A.C. motor

Transformer

D.C. motor

The Direction of induced current is always so as to oppose the change which causes the current, is:

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Faraday's law

Lenz's law

Ohm's law

Kirchhoff' s1ast rule

The illustration of the phenomenon of mutual induction is in the device of

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Transformer

Inductor

A.C. Generator

Ammeter

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

For inducing emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both (b) and (c) are true

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Physics Fsc Part 2 Chapter 4 Online Test MCQs With Answers

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