Question # 1

Helium-Neon laser discharge tube contains neon

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82%

15%

25%

85%

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

The electrical intensity is equal to:

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-Δr/Δv

Δv/Δr

Δv/Δv

-Δv/Δr

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

Which consumes small power.

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Inductor

Resistor

Motor

All of these

A simple device that prevents the direction of current from changing is called.

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Commutator

Rotor

Armature

Detector

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

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10%

15%

85%

90%

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

In current carrying long solenoid the magnetic field produced does not depend upon.

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The radius of solenoid

Number of turns per unit length

Current flowing through solenoid

All of the above

The number of Isotopes of cesium are.

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4

32

22

36

Which component of the transistor has greater contrition of impurity.

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Base

Emitter

Collector

Emitter and collector

The most suitable metal for making permanent magnet is.

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Iron

Aluminium

Steel

Copper

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None of the above

___ is correct relation.

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IT = 10^-4G

IT = 10⁴ G

IT = 10² G

IT = 10^-2 G

The open loop gain of the amplifier is order of.

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10⁶

10⁵

10⁷

10³

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

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Free electrons

Holes

Protons

Mesons

If the number of turns become double but length remain same, then magnetic field in the solenoid become.

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Half

Double

Remain same

Zero

The potential difference across depletion region in case of Si is

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0.6 volt

0.9 volt

0.7 volt

0.2 volt

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