Question # 1

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

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

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photon

position

antiproton

antineutrino

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

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

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

The number of isotopes of hydrogen are

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2

1

3

4

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

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