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

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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

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

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

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

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

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 total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

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

Which of the following material has longer half life

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radium

polonium

radium

uranium

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