Question # 1

Number of poles in a magnet is:

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One

Two

Three

Unlimited

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

The cathode ray oscilloscope consists of main parts:

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Two

Three

Four

Five

When we heat the metal at high temperature they emit:

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Holes

Protons

Neutrons

Electrons

Electric motor converts electrical energy into:

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Chemical energy

Solar energy

Heat energy

Mechanical energy

The instrument which is used to display the magnitude of changing electric current is called:

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Evacuated tube

Cathode rays oscilloscope

Television tube

Picture tube

D.C. motor converts.

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Mechanical energy into electrical energy

Mechanical energy into chemical energy

Electrical energy into mechanical energy

Electrical energy into chemical energy

When a current carrying conductor is placed in magnetic field at right angle to it. The direction of force acting upon it is:

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The same as direction of field

Opposite the direction of field

Makes an angle of 45^owith the current

At right angle to both the field and the current.

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

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

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Circular

Straight

Solenoid

None of these

In totally reflecting prism one angle is of:

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45°

90°

180°

120°

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

According to coulomb’s law, what happens to the attraction of two oppositely charged objects as their distance of separation increases:

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Increases

Decreases

Remains unchanged

Cannot be determined

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