Question # 1

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

Transformer works on _______ supply.

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A.C

D.C

Battery

Both A and B

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

Bouncing back of light after striking the surface is called:

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Refraction

Reflection

Diffraction

Interference

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

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Circular

Straight

Solenoid

None of these

The presence of a magnetic field can be detected by a

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small mass

Stationary positive charge

Stationary negative charge

Magnetic compass

Totally reflecting prism is used in:

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Periscope

Binoculars

Periscope and binocular

Telescope

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

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

The magnetic field of a solenoid resembles as:

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Iron wire

U-shape magnet

Bar magnet

Point charge.

To see from submarine and the ship at the surface of water, we use:

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Telescope

Microscope

Periscope

Prism

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

In totally reflecting prism one angle is of:

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45°

90°

180°

120°

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