Question # 1

Transistors with various combinations are widely used as switches in.

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electric generators

Rectificers

Amplifiers

Computers

Compton scattering experiment seemed to indicate that radiation had

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Wave nature

Particle nature

Wave particle nature

X-rays nature

Half life and mean lifetime of a radioactive element are.

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Equal to each other

Inversely proportional to each other

Directly proportional to each other

Not related to each other

Which of the following can be used as an arrester in a nuclear reactor.

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Graphite

heavy water

Uranium

Cadmium

An example of continuous spectrum is.

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Black body radiation spectrum

Molecular spectra

Atomic spectra

All of the above

The number of electrons in U nucleus are.

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92

235

zero

143

Which one among these contacts in a transistor is non rectifying.

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Base

Emitter

Collector

None of these

The term used for the emission of electrons when light strikes a surface.

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The zeeman effect

The photo electric effect

Skin effect

Compton effect

The scientific theory concerning the coming into existence of universe.

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Cosmology

Cosmogony

Cosmography

Cosmos

When Photon incident on a metal produce the emission of electrons the process is called.

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Photo electric effect

Pair production

x-rays production

Gama ray production

The binary equivalent of 25 is

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111001

11001

1001

10101

Why is a capacitor resistor combination used in oscillators in grid circuit.

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To generate oscillation

To bias the grid automatically

To amplify oscillations

To sustain the oscillations.

The usefulness of X rays is largely due to their

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Mass

Density

Volume

Penetrating power

How many types of quarks were suggested i 1964 quark theory.

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Two

Three

Four

Five

What is the basic advantage of class A operation of an amplifier.

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It has high efficiency

It has high gain

It has low distortion

It has high distortion

The part of theory of relativity which deals with accelerated bodies is called.

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special theory of relativity

General theory of relativity

Lorentz's theory of relativity

Galilean theory of relativity

Work function is generally expressed in.

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Electron volt

Joules

Newtons

Gauss

In heavy elements of the periodic table the number of neutrons than protons are.

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Lesser

Greater

Equal

Undetermined

The emission of photons by a metal when electrons are incident is called.

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Photo electric effect

Pair production

X-rays production

Gama ray production

Which of the following propagates at the same speed as velocity of light.

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Heat waves

Sound waves

Shock waves

Beta particles

The most suitable material for moderator in a nuclear reactor is.

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B

Cd

D2O

Uranium

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