Question # 1

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

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Negative

Positive

High positive

Zero positive

Electric motor converts electrical energy into:

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Chemical energy

Solar energy

Heat energy

Mechanical energy

Which device has two coils, primary and secondary?

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D.C. Motor

Transformer

A.C. genrator

a and b

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

The output of a NAND gate is 0 when:

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Both of its inputs are 0

Both of its inputs are 1

Any of its inputs is 0

Any of its inputs is 1

When did Michael Faraday discover Electromagnetic induction?

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1841

1831

1821

1811

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

Who discovered Electromagnetic induction?

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Michael Faraday

Flemiing

Ohm

Coulomb

The minimum value of angle of deviation is called:

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Minimum angle

Incident angle

Angle of minimum deviation

None of these

Changing magnetic field in a closed circuit can induce:

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e.m.f

Electric current

Force

Both A and B

In electric motor, the brushes are made of:

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Lead

Graphite

Iron

Wood

The value of refractive index of water is:

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2.33

1.36

1.33

1.39

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