Question # 1

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

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B

Cd

D2O

Uranium

The 'x' in X-rays means

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Xenon

Explosion

x for unknown

X makes the spot

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

Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.

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20 minutes

40 minutes

80 minutes

120 minutes

The maximum K.E. with which photoelectrons are emitted depends very strongly on the.

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Intensity of incident light

Electric field near the photocathode

Frequency of incident light

Polarization of incident light

Binding energy per nucleon is.

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Greatest for heavy nuclei

Least for heavy nuclei

Greatest for light nuclei

Greatest for medium weight nuclei

X-ray are

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Streams of negatively charted particles.

Electromagnetic wave

Streams of positively charged particles

Visible light

Which BJT configurations used for signal inversion.

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CE

CC

CB

BE

As oscillator is basically an amplifier with loop gain

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Zero

Infinity

Less than unity

More than unity

Specially designed solid state detector can be used to detect.

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Alpha particles

Beta particles

Gama rays

X- rays

A unijunction transistor

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Has only one junction

Is a two terminal device

Is fabricated from germanium

Is fabricated fromuranium

The most abundant isotope of neon is.

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Neon -20

Neon -21

Neon -22

Both a and c

Sub atomic particles which experience strong nuclear force are.

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Leptons

Hadrons

Mesons

Quarks

The Inner electrons in heavy atoms can be disturbed and dislodged by.

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X rays

Alpha particle

Beta particles

gama particles

Special theory of relativity deals with the events in the frames of reference which move with constant.

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Time interval

Acceleration

Momentum

space interval

Which of the following quantities is discrete according to Bohr's hypothesis.

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Momentum

Potential energy

Angular velocity

Angular momentum

Negative feedback

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Increases stability

Decreases stability

Produces oscillatory

Cannot occur

The chemical behavior of an atom is determined by

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Mass number

Number of Isotopes

Atomic number

Binding energy

In CC configuration voltage gain is.

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Less than one

More than one

One

Zero

Transistors with various combinations are widely used as switches in.

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electric generators

Rectificers

Amplifiers

Computers

the gain of an amplifier is independent of

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The two externally connected resistances

What is happening inside the amplifier

Internal structure of the amplifier

All of the above

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