Question # 1

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

How many isotopes of helium are present?

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1

2

3

4

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

When a nucleus emits an alpha particle, it atomic mass decreased by

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2

1

4

3

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

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A - Z

A + Z

Z

A

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

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