Question # 1

An active component of an electronic circuit consisting of a small block of semiconducting material to which at least three electrical contacts are made is known as.

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Rectifier

Amplifier

Thermocouple

Transistor

Which one the following is not a component of a Bipolar junction Transistor

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Base

Emitter

Collector

Grid

The total number nucleons in a nucleus are called.

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Mass number

Atomic number

Neutron number

Isotopes

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

According to Max. Planck, energy is released or absorbed in discrete packets called.

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quanta

Meson

Energy shells

Position

The working of cloud chamber is based in the presence of.

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Super heated vapours

Liquid

Super saturated vapors

Unsaturated vapours

Which one of the following has the largest wavelength.

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x rays

Infrared rays

Visible light

Radio waves

The energy in an electromagnetic wave is carried in the units called.

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Protons

Electrons

Neutrons

Nucleus

The half life of isotopes X is four days and its initial mass is 32 mg What mass of the isotope X will remain after twelve days.

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2 mg

4 mg

8 mg

18 mg

A transistor consists of.

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One p-n junction

Two p-n junctions

Three p-n junctions

Four p-n junction

The energy that must be added to separate the nucleus is called.

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Critical energy

Binding energy

Gravitational energy

Electrostatic energy

In a cloud chamber the Alpha particles leave

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Dense, straight and continuous tracks

Only straight and continuous tracks

Thin and discontinuous tracks

Irregular tracks

Which particle interact via all fundamental forces.

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Leptons

Hadrons

Muons

mesons

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

The phenomenon of radioactivity is associated with

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Decay of nucleus

Decay of atoms

Fusion of nuclei

Emission of electrons

The exitance of more than one distinct state with the same energy is called.

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Exigency

Degeneracy

Normally

Emergency

The most abundant isotope of neon is.

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Neon -20

Neon -21

Neon -22

Both a and c

The advantage of electron tube over a transistor is.

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Low consumption of power

Low input impedance

Its high efficiency

Its high gain

Choose the one which acts as single inverter.

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Common emitter

common collector

Common base

Diode

The electrons behave as wave because.

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They can be diffracted by a crystal

They can be defecting by magnetic field

They can be deflecting by electric field

they can produce ions in gases

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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