Question # 1

The dead time of G.M tube is.

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10^-1 sec

10^-6sec

10^-4sec

10^-8sec

The crystalline structure of NaCl is.

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Cubical

Hexagonal

Tri gonal

Tetragonal

The device which allows only the flow of D.C. is.

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Capacitors

transformer

Inductor

Generator

Charge on an atom is:

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Positive

Negative

Neutral

None of these

Force on a charged particle is zero when projected at angle with magnetic field.

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0 ^o

90^o

180^o

270^o

An electron moves at 2 x 10² m/sec perpendicular to magnetic field of 2T what is the magnitude of magnetic force:

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1 x 10^-6 N

6.4 x 10^-17 N

3.6 x 10^-24 N

4 x 10⁶ N

1 Henry =

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VSA^-1

VS^-1A^-1

V^-1SA

VSA^-2

For step down transformer

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Ns>Np

Np > Ns

Ns = Np

Ns > > > Np

The AC system is preferred to DC system because:

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AC voltage can be easily changed in magnitude

DC motor angular velocity is affected badly

High voltage AC transmission is less efficient

Domestic appliance require AC voltage for their operation

The mutual inductance of the coils depends upon.

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Stiffness of the coils

Density of coils

Material of coils

Geometry of the coils

The P.D develop in case of germanium is:

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0.3

0.7

0.5

0.9

There is no charge in A and Z of any radioactive element by the emission of.

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Alpha particle

Beta particle

Gama particle

X- rays

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

The SI unit of relative permittivity is.

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Fm-1

C2N-1m-2

Nm2C-2

No unit

X- ray diffraction reveals that these are

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Particle type

Wave type

Both wave and particle

None of above

Electromagnetic induction is exactly according to law of:

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Momentum

Charge

Energy

Mass

Binding energy per nucleon is maximum for

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Platinum

Iron

Uranium

Lead

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

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