Question # 1

In Helium Neon laser, discharge tube is filled with Neon gas.

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10%

15%

85%

90%

The sensitivity of galvanometer directly depends upon

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Magnetic field

Area of coil

Both a and b

None of a, b, c

A device that shows the visible path of ionizing particle is called.

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GM counter

Solid state detector

Scalar

Wilson cloud chamber

The work done is bringing a unit positive charge from infinity to that point in an electric field is called.

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Potential

Potential difference

Absolute potential

All of these

Those materials whose resistivity becomes zero at certain temperature is called:

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Semiconductor

Super conductor

Conductor

Insulator

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

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I V

0.25 V

0.5 V

0.6 V

The most common source of an A.C. Voltage is.

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Motor

Cell

Generator

Thermo couple

Electron vibrating 94,000 times each second will produce radio waves of frequency.

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94 Hz

940 HZ

94 Hz

490 Hz

If the following particle have the same energy, which particle has the shortest wave length.

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alpha particle

Neutron

Beta particle

Proton

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

In 'N' type material, the minority charge carriers are.

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Free electrons

Holes

Protons

Mesons

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

Which one of the following is not affected by electric or magnetic field.

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Beta rays

Gama ryas

Alpha rays

Electron

Very weak magnetic field produced by brain can be detected by

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MRI

CAT scans

Squid

CRO

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

In LR circiut which one of the following statements is correct?

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L and R opposes each other

R value increases with frequency

The inductive reactance increases with frequency

The inductive reactance decreases with frequency

The device in the circuit that consume electrical energy are known as.

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Dissipaters

Generator

Load

Motors

In chopke coil the resistance X_L an resistance R are:

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X_L=R

X_L<<R

X_L>>R

X_L=∞

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