Question # 1

According to Fleming's left hand rule the direction of magnetic field is indicated by:

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Thumb

Forefinger

Middle finger

Right hand rule

Who discovered Electromagnetic induction?

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Michael Faraday

Flemiing

Ohm

Coulomb

The end of solenoid from which lines of force emerge out is called:

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North pole

South pole

North and south pole

None of these

The lines will be in the form of concentric circles, if conductor is:

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Circular

Straight

Solenoid

None of these

Which device has two coils, primary and secondary?

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D.C. Motor

Transformer

A.C. genrator

a and b

The refractive index of ice is:

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1.00

1.33

1.31

2.42

If the change of current in a circuit induces a current in another circuit, this phenomena is known as:

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Self induction

Mutual induction

Electromagnetic induction

None mutual induction

If the current in a wire which is placed perpendicular to a magnetic field increases, the force on the wire.

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Increases

Decreases

Remains the same

Will be zero

Which part of a D.C. motor reverses the direction of current through the coil every half-cycle.

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The armature

The commutator

The burshes

The slip rings

The true ratio of a transformer is 10. It means:

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Vs = 10Vp

Ns = Np/10

Ns = 10NP

VS= Vp/10

The coil of a transformer which is connected to A.C is called:

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Primary coil

Secondary coil

Field coil

Armature coil

The magnetic field of a solenoid resembles as:

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Iron wire

U-shape magnet

Bar magnet

Point charge.

According to Fleming's left hand rule the direction of force on the conductor is given by:

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Thumb

Fore finger

Middle finger

None of these

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