Question # 1

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

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

Neutrons are

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positive charge

negatively charged

massless

neutral

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

How many isotopes of helium are present?

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1

2

3

4

The number of isotopes of hydrogen are

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2

1

3

4

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

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A - Z

A + Z

Z

A

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

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

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

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

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

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

Nucleus of a hydrogen atom may contain:

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One neutron only

Two protons and one neutron

Two protons and two neutrons

Aany of above

One proton only

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

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