Question # 1

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

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

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Water

Heavy water

Carbon

Hydrocarbon

All of these

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

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isotones

isomers

isotopes

isobars

1 amu is equal to

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-34kg

1.66 x 10^-27kg

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

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50

100

150

200

250

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

In radio-active decay, the original element which disintegrate to another element is called

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element

daughter element

parent element

none of these

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

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