Question # 1

Which of the following can be used as an arrester in a nuclear reactor.

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Graphite

heavy water

Uranium

Cadmium

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

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Super heated vapours

Liquid

Super saturated vapors

Unsaturated vapours

One gray is equal to.

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1 J-1 kg -1

1 J -1 kg -2

1 J 1 -g-1

1 j kg -2

The most readily fissionable isotope of uranium has atomic mass of

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234

235

236

238

Work function is generally expressed in.

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Electron volt

Joules

Newtons

Gauss

Specially designed solid state detector can be used to detect.

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Alpha particles

Beta particles

Gama rays

X- rays

Neither the position nor the momentum of a particle can be predicted with arbitrarily great precision is the statement of.

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Archimede's principle.

Heisenberg uncertainty principle

Mosley's law

Schrodinger's wave equation

Which of the following describes that the time interval between two events may be different in different of references

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Simullaneously

Time dilation

Length contraction

Mass variation

Tracer techniques make use of.

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Neutron scattering

Electron beams

LASER

Radioactive isotopes

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

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Crystal structure

Crystal surface

Crystal symmetry

Crystal atoms

In a transistor which one is very thin.

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Collector

Emitter

Base

Depletion region

On which factor cut off wavelength of X-rays coming from a Coolidge tube depends upon.

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Target material

Accelerating voltage

Filament temperature

Separation between target and the filament

Particle which can be added to the nucleus of an atom with changing its chemical properties are called.

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Electrons

Protons

Neutrons

Alpha particles

In heavy atims the electrons are assumed to be arranged in.

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Elliptical shells

Inner shells

Concentric shells

Outer shells

Lines of Balmer series are emitted by hydrogen atom when the electron jumps from

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The first orbit to any other orbit

Higher orbits to second orbit

Higher orbits to first orbit

The third orbit to higher orbit

Transistor are made from

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Plastics

Metals

Insulators

Doped semiconductors

In a Geiger Marsden experiment why do the great majority of the Alpha particles pass straight through the metal foil.

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Atomic nuclei may contain neutrons

Atoms are electrically neutral

Atoms are largely empty space

Atoms have positively charged nuclei

LASER is a device which can produce.

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Monochromatic beam of light

Coherent beam of light

An intense beam of light

All of the above

Which of the following atom pair have the same structure.

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N, C

B, Li

H2 , Ne

Li , Na

Radioactivity is the phenomenon associated with the.

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Transition of radiowaves

production of alpha particles only

Decay of nucleus

Reception of radio waves

Base current of a transistor is 1 mA and collector current is 99 mA What is emitter current.

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1 mA

100 mA

98 mA

110 mA

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