Question # 1

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

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

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

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

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

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deuterium

protium

tritium

none of these

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

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

Neutrons are

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positive charge

negatively charged

massless

neutral

1 amu is equal to.

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-24kg

1.66 x 10^-27kg

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

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

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Water

Heavy water

Carbon

Hydrocarbon

All of these

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

Referring to the above figure, we can say that of all the elements, the most stable element is

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Phosphours

Iron

uranium

Lithium

Bismuth

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

The number of isotopes of hydrogen are

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2

1

3

4

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

Which of the following material has longer half life

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radium

polonium

radium

uranium

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Proton was discovered by Rutherford in

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1915

1906

1910

1920

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

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