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

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

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

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

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 all the isotopes of an elements are

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same

different

slightly different

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

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

Which of the following material has smaller has life

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uranium

polonium

radium

radian

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

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

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