Question # 1

One particle having zero mass and zero charge is.

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Positron

Electron

Neutrino

Neutron

The most abundant isotope of neon is.

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Neon -20

Neon -21

Neon -22

Both a and c

Alpha particles emitted from a radioactive material are.

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He nucliei

H -nucliei

Li nucliei

B nucliei

Radioactive substances do not emit

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Alpha particles

Beta particles

Gama rays

Neutrons

X-rays are absorbed maximum by

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Paper

Copper

Steel

Lead

Which one of the following is a convenient energy unit to express the energy of sub atomic particles.

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Joule

electron volt

Watt

Curie

One becquerel is equal to

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Decay of orie radioactive atoms per second

Decay of 10 radioactive atoms per secnd

Decay of 100 radioactive atoms per second

Decay of infinity radioactive atoms per second.

The phenomenon is which the wavelength of scattered X-rays is larger than the incident X-rays is known as.

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Zeeman's effect

Photoelectric effect

Compton's effect

Annihilation of matter

The most convenient unit for energy at the atomic level is.

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Joule

Watt second

Newton metre

Electron volt

The usefulness of X rays is largely due to their

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Mass

Density

Volume

Penetrating power

When transistor works as an amplifier, its output is.

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More

Less

Zero

Directly proportional to the input

Bohr's atomic model assumes

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Nucleus is of infinite mass and is at rest

electron in a quantized orbit will not radiate energy

Mass of electron remains the same

All of the above

A single quantum of electromagnetic radiation is termed as.

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Compton

Photon

Hyperon

Meson

The input exultation for a JFET is

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Current signal

Voltage signal

Voltage and current signals

Neither voltage nor current signal

Choose the one which acts as single inverter.

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Common emitter

common collector

Common base

Diode

The most readily fissionable isotope of uranium has atomic mass of

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234

235

236

238

Low frequency response of an amplifier is mainly limited by.

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Biasing configuration

Coupling capacitor

By pass capacitor

Input impedance

Most widely used types of gas LASER are

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Neon

Argon ion

Helium

All of these

The electrons behave as waves, because they can .

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Produce ions in gases

Diffracted by a crystal

Be deflected by electric fields

Be deflected by magnetic fields

The energy of neutrons obtained during a fission reaction is.

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0.1 MeV

1 KeV

1 MeV

Zero

Which is the famous standard model of the universe.

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the big bang

Casmos

Astronaut

The small stap

Which of the following configuration of BJTs gives both voltage gain and current gain.

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common Base

Common Emtter

Common collector

All of the above

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

LED is a p-n junction that emits

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Visible light

X- rays

Ultraviolet light

electromagnetic waves

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