Question # 1

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

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

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Gamma rays consist of steam of

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electron

proton

photons

all of these

Neon gas have three isotopes whose atomic numbers are

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20, 24 , 23

20, 21 , 22

20, 19 , 21

none of these

Binding energy per nucleus is

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greater for heavy nucleus

least for heavy nucleus

greatest for light nuclei

decreases for medium weight niclei

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

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

Charge on proton is

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1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

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