Question # 1

The continuous x rays spectrum is obtained due to

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Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

When Be is bombarded by alpha particles, then we obtain

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electron

Proton

Positron

Neutron

Which particles have spin quantum number 1/2

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Mesons

Laptons

Hadrons

Muons

In which reaction two or more small light nuclei nuclei come together or fuse to form a large nucleus.

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Radioactivity

Radioactivity dating

Nuclear fusion

Nuclear fission

The unit generally used for measuring astronomical distances is.

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Parsecs

Light year

Metre

Kilometer

A device used to determine mass of an isotope quite accurately is known as.

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Spectrometer

Mass spectrometer

Mass detector

Electronic balance

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

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uranium

Cadimium

Boron

Steel

X-rays travel with

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The speed of light

The speed of sound

The speed of 3,000 m s-1

The speed of 3,500 m s-1

A spectroscope sorts out

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Atoms

Molecules

Elements

Isotopes

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

The angle of scattering for which the Compton shift is maximum is.

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0^o

45 ^o

80 o

180^o

In a photocell, certain metals emit electrons for

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Visible light

X-rays

Infrared light

Ultraviolet light

The Beta particles move along.

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Straight path

Curved path

Zig Zag path

Circular path

Which of the following atom pair have the same structure.

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N, C

B, Li

H2 , Ne

Li , Na

Beta decay may occur by

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Beta minus

Beta Plus

Electron capture

All of these

Tracer techniques make use of.

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Neutron scattering

Electron beams

LASER

Radioactive isotopes

The binding energy per nucleon for uranium is about.

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7.7 MeV

9.6 MeV

13.6 MeV

21.6 MeV

Transistor stands for

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Transfer of resistance

Transfer of current

Transfer of power

Transfer of voltage

Low frequency response of an amplifier is mainly limited by.

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Biasing configuration

Coupling capacitor

By pass capacitor

Input impedance

The reciprocal of decay constant lamda of a radioactive substances is equal to.

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total life

Half life

Mean life

Curie

The process by which nuclei emit a ,b and gama rays in order to attain stability is called.

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Radioactive disintegration

Radio activity

B decay

Radioactive transmulation

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