Question # 1

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 photons emitted in inner shell transition are.

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Alpha particle

Beta particle

Gama particle

Characteristic X-rays

The half life of a radioactive substance as compared to its mean lif eis.

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30%

50%

70%

90%

When Be is bombarded by alpha particles, then we obtain

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electron

Proton

Positron

Neutron

Why transistor is preferred to triode valve for use as an amplifier.

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Because it can handle large power

Because it has higher input impedance

Because it has higher voltage gain

Because it has lower voltage gain

Which of the following is the most commonly used regions of operations for a transistor.

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Cut off

Saturation

Active

All of these

In order to reduce uncertainty in momentum one must use light of.

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Short wavelength

Large wavelength

Wavelength of intermediate value

Wavelength of any value

In which of the following studies x-rays are not helpful.

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Crystal structure

Crystal surface

Crystal symmetry

Crystal atoms

X-rays are

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Longitudinal wave

Transvers waves

Secondary waves

Fast sound waves

The back ground radiation in the atmosphere on the average is

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0.5 Sv per year

1.0 Sv per year

1.5 Sv per year

2.0 Sv per year

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 half life of a given radioactive isotope is 10 years The original mass of the isotope is 12 g What mass of this isotope remains un decayed after 20 years.

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0.5 g

1.2 g

3.0 g

6.0 g

In a Nuclear reactor which material is often used as modeerator.

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Water

Graphite

Uranium

Water and graphite

Besides U ²³⁵ what else is needed for making as atomic bomb.

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Electons

Protons

Neutrons

Photons

NOR gate is a combination of.

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OR gate and NOT gate

OR gate and AND gate

OR gate and OR gate

NOT gate and AND gate

In CE amplifier phased reversal occurs when the output voltage is taken between

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Base and collector

Base and emitter

Collector and emitter

None of the terminals

The wavelength of Lyman series for hydrogen spectrum lies in the.

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Visible region

Ultraviolet region

Infrared region

Far infrared region

The resistance between(+) and (-) inputs of an amplifier is.

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Zero

Low

High

Infinity

When a posirtron is emitted it causes.

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Mass number to increase by one

mass number to decrease by one

Atomic number to decrease by one

Atomic number to increase by one

The binary equivalent of 25 is

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111001

11001

1001

10101

the alpha particle does not travel for enough in air.

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Due to its intense ionization

Due to its large mass

Due to its high charge

Due to its Hight Ionization

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