Question # 1

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

The number of isotopes of hydrogen are

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2

1

3

4

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

Examples of moderators used in a fission reactor is/are:

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Water

Heavy water

Carbon

Hydrocarbon

All of these

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

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