Question # 1

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 SI unit of current gain is.

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Ampere

Ampere metre

Ampere volt

It has no unit

Phenomenon of radioactivity is due to disintegration of.

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Proton

Neutron

electron

nucleus

Which experiment confirmed the de Broglie hypothesis.

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Double slit experiment

Division germier experiment

Schrodinger's Cat experment

Bohr's experiment

In a resistor, when base width decreases with increasing Vbc, this phenomenon is called.

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Tunneling

Thermal runway

Pinch off

Early effect

Which one of the following gates in a a universal gate.

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OR

AND

NOT

NAND

As the mass number varies, which of the quantities does not change w.r.t nucleus.

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Mass

Volume

Binding energy

Density

The X-rays coming from a X-rays tube

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Is monochromatic

Has all wavelengths smaller than a certain maximum wavelength

Has all wavelengths greater than a certain maximum wavelength

has all wavelengths minimum than a certain maximum wavelength

The number of electrons in U nucleus are.

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92

235

zero

143

x-rays cannot produce

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Photoelectron

Compton electron

Electron positron pair

All of these

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

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Zero

Low

High

Infinity

A darling ion amplifier is characterized by

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High voltage and current gain

High input resistance and current gain

High output resistant and current gain

Low input resistance and current gain

The rest mass of a particle is independent of the

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Wavelength of the particle

Mass of the particle

Speed of the particle

Energy of the particle

The Beta particles move along.

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Straight path

Curved path

Zig Zag path

Circular path

Ebers-Moll model describes the working of a

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BJT

FET

MOSFET

UJT

The neutral atoms of all isotopes of the same element contain the same numbers of.

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Electrons and protons

Electrons and neutrons

Neutrons

Neutrons and protons

The chain reaction is controlled by a series of rods usually made of.

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uranium

Cadimium

Boron

Steel

Compton scattering experiment seemed to indicate that radiation had

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Wave nature

Particle nature

Wave particle nature

X-rays nature

Work function is generally expressed in.

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Electron volt

Joules

Newtons

Gauss

The electron behave an waves because

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They can be diffracted by a crystal

They can produce ions in gases

They can be deflected by magnetic field

They can be deflected by electric field

The simple form of particle accelerator is.

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Cathode ray tube

Oscillator

_Amplifier

Phase locked loop

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