Question # 1

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

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

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2

1

4

3

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

none of these

Which of the following material has smaller has life

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uranium

polonium

radium

radian

Which of the following material has longer half life

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radium

polonium

radium

uranium

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

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

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Water

Heavy water

Carbon

Hydrocarbon

All of these

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

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

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Frequency

Half life

Year

Mean life

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

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

Neutrons are

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positive charge

negatively charged

massless

neutral

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

The energy is found from Einstein's mass energy relation is called

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binding energy of electron

binding energy of proton

binding energy of neutron

binding energy of nucleus

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