Question # 1

The magnetic field of a solenoid resembles as:

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Iron wire

U-shape magnet

Bar magnet

Point charge.

In D.C.motor split rings are made of:

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Steel

Carbon

Copper

Iron

Which device is used to increases / decreases A.C Voltage?

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Electric motor

Transformer

A.C Generator

Solenoid

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

Number of poles in a magnet is:

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One

Two

Three

Unlimited

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

A positive electric charge:

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Attracts other positive charge

Repels other positive charge

Attract a neutral charge

Repels a neutral charge

In C.R.O grid is always connected with potential:

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Negative

Positive

High positive

Zero positive

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

In NOT gate number of input terminals is/are:

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1

2

3

4

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

The step-up transformer

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Increases the input current

Increase the input voltage

Has more turns in the primary

Has less turns in hte secondary coil

A.C generator works on the principle of:

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Electrostatic induction

Electromagnetic induction

Law of gravitation

Third law of motion

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