Question # 1

The potential barrier for silicon is.

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0.7 V

0.5 V

0.3 V

0.9 V

The device which is used as amplifier and works with the negative feedback is.

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Operational amplifier

P-n-p transistor

n-p-n transistor

Transistor

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

100 micro F capacitor is connects to an AC voltage 24 V and frequency 50 Hz. The reactance of the capacitor is.

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30.8 Ohm

31.8 Ohm

34.8 Ohm

40 Ohm

Young's modulus for water's is

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Zero

1

2

3

Bremsstrahlung radiation are examples of

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Atomic spectra

Molecular spectra

Continuous spectra

Discrete spectra

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

When Ohm meter gives full scale deflection it indicates.

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Zero resistance

Infinite resistance

Small resistance

Very High resistance

Before and after nuclear reaction the number of protons and neutrons:

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Must be different

Must be decreased

Must be increased

Remains same

Conversion of A.C into D.C is called:

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Compton effect

Rectification

Amplification

Pair production

The resistivity of two wires isρ₁ andρ₂ which are connected in series. If there dimentions are same then the equivalent resistivity of the combination will be:

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(ρ₁ +ρ₂)

1/ρ₁+ 1/ρ₂

ρ₁+ρ₂/2

ρ_1/ρ₂

Doping is made comparatively larger in

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Emitter

Base

Collector

P -type semi conductor

For workers in nuclear facilities is, a weekly does of is normally considered safe

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1.0 msv

5.0 msv

2.0 msv

3.0 msv

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

SI unit of hennery which is.

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VSA-1

VS-1 A

VS-1A-1

VSA

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

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

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Semiconductor

Super conductor

Conductor

Insulator

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