Question # 1

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

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none 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

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

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

The number of isotopes of hydrogen are

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2

1

3

4

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

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

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

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

Radiation detector are used to

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measure intensity of radiation

measure energy of radiation

difference between different types of radiation

all the above

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

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

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