Question # 1

When an electric current passes through a conductor, which field is produced around it?

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Electric field

Magnetic field

Gravitational field

Electrostatic field

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

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

The voltage is decreased by:

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Step-up transformer

Step-down transformer

A.C. generator

D.C. Motor

When we heat the metal at high temperature they emit:

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Holes

Protons

Neutrons

Electrons

In totally reflecting prism one angle is of:

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45°

90°

180°

120°

A transformer has Np =100 and Ns =500 , if 6 volt D.C is applied across its primary, the induced voltage.

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0 V

30 V

45 V

60 V

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

Transformer works on _______ supply.

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A.C

D.C

Battery

Both A and B

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

Magnetic effect of electric current was first discovered by:

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Faraday

Ampere

Volta

Lenz

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

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

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