Question # 1

The ratio Beta in transistor is called.

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Voltage gain

Emitter gain

Current gain

Nuclear gain

If speed of rotation of a generator is doubled the output voltage will be.

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Remain same

Double

Four time

One half

Torque on a current carrying coil

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τ=IBA cos

τ = ILB sinα

τ = IBA sinα

τ = ILBcosα

Helium Neon Laser Beam emitted from discharge tube has a colour.

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Blue

Green

Red

Black

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

If I_o is the peak value of current, then its root mean square value is given by

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2 I_o

I_o

0.7 I_o

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

A° is the unit of:

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Energy

Length

Nuclear energy

Work

The electric intensity due to two oppositely charged plates is

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None of these

Radius of first Bohr's orbit is.

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0.053 nm

0.053 mm

0.053 micro meter

0.053 m

When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

1 rad =

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0.001Gy

0.01Gy

0.1Gy

1.01Gy

Gamma radiations are emitted due to:

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De-excitation of atom

De-excitation of nucleus

Excitation of atom

Excitation of nucleus

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

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Free electrons

Holes

Protons

Mesons

For inducing emf in a coil the basic requirement is that:

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Flux should link the coil

Change in flux should link the coil

Coil should form a closed loop

Both (b) and (c) are true

Presence of dielectric always.

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Increase the electrostatic force

Reduces the electrostatic force

Do not effect electrostatic force

Doubles the electrostatic force

Some charge is being given to a conductor. Then its potencial

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Its maximum at surface

Its maximum at Its maximum at center

Is remain same throughout the conductor

Is maximum somewhere between surface and centre

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