Question # 1

The value of refractive index of water is:

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2.33

1.36

1.33

1.39

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

A transformer has 100 turns in its primary and 500 turns in secondary coil. If 6 volts D.C is applied across its primary, the voltage induced across its secondary coil will be:

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0 volt

30 volts

45 volts

60 volts

In totally reflecting prism one angle is of:

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45°

90°

180°

120°

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

When we heat the metal at high temperature they emit:

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Holes

Protons

Neutrons

Electrons

The force on a current carrying conductor is maximum if angle between field and conductor is:

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0^o

90^o

180^o

45^o

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

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Telescope

Microscope

Periscope

Prism

The turn ratios of a transformer is 10. It means.

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I_s = 10I_p

N_s = N_p

N_s = 10 N_p

V_s =V_p /10

The direction of induced e.m.f. in a circuit is in accordance with conservation of.

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Mass

Charge

Momentum

Energy

Transformer which increase voltage is called.

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Step-up transformer

Step down transformer

D.C.Moter

A.C.genrator

The refractive index of ice is:

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1.00

1.33

1.31

2.42

In compound microscope, the objective have focal length than eye-piece:

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Smaller

Larger

Equal

Equal and larger

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