Question # 1

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

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A - Z

A + Z

Z

A

The nuclei of an element having the same charge number but different mass numbers are called:

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

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

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

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

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

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

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Which of the following material has smaller has life

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uranium

polonium

radium

radian

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Which of the following material has longer half life

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radium

polonium

radium

uranium

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