Question # 1

Gamma rays consist of steam of

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electron

proton

photons

all of these

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

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

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Frequency

Half life

Year

Mean life

None of these

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

Proton was discovered by Rutherford in

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1915

1906

1910

1920

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

Electrons are

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positive charged

negatively charged

massless

neutral

Which of the following material has longer half life

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radium

polonium

radium

uranium

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

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Water

Heavy water

Carbon

Hydrocarbon

All of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

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

The range of particle depends upon the factor

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charge, mass and energy of particle

density of medium

ionization potential of the atoms

all the above

Rutherford performed an experiment on nuclear reactions in:

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1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

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