Question # 1

The phenomenon of radioactivity is associated with

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Decay of nucleus

Decay of atoms

Fusion of nuclei

Emission of electrons

Which type of amplifier causes minimum drain of power supply.

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Class -A

Class -B

Class-C

Class -AB

Critical mass is the minimum mass needed for

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Fusion

H-Bomb

Chain reaction

Binding energy

When using the formula E = h lambda what unit should energy have.

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Joule

Watt second

Newton metre

Electron volt

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

In de Brogile model electron orbit must form

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Spectrum

Wave packets

Franhoffer lines

Clouds

What is the energy equivalent to amu in Me V

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0.931 MeV

9.31 MeV

93.1 MeV

931 MeV

Which type of radiation would be stopped completely by a thin piece of cardboard.

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Alpha particles

Beta particles

Gama rays

X -rays

In n-p-n transistor the current flows in the direction from

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Emitter to base

emitter to collector

Base to emitter

Base to collector

An operational amplifier have how many input terminals.

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One

Two

Three

Four

The decay to form other nuclides by emitting particles and electromagnetic radiations by unstable nuclides is called.

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Nuclear stability

Radioactivity

Carbon dating

Spontaneously

Which of the following is not a mode of radioactive decay.

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Positron emission

Electron capture

Fusion reaction

A decay

Which of the following radiations will burn human skin

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Infrared

Ultraviolet

X rays

Alpha particles

Two electrons approach each other their relative velocity will be.

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Zero

c

c/2

Infinity

Which of the following is not an electromagnetic wave.

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game rays

Ultraviolet rays

Ultrasonic waves

Microwaves

Which of the following is basic transistor configuration.

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CB

CC

CE

All of these

There are how many types of forces or interactions.

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Two

Three

Four

Five

The wavelength of X-rays is of the ofder of.

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10^-14 m

10^-10 m

10^-9 m

10^-6 m

Which temperature is required for the fusion of two nuclides.

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10⁶ K

10⁷K

10⁸K

10 ⁹ K

The charge on a helium nucleus is equal to the charge of.

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Two electrons

Two protons

Two neutrons

One proton

The process of pair production will take place if the energy of photon is greater than.

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

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