Question # 1

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

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

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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

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

When a nucleus emits an alpha particles, its charge number decreases by

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3

2

6

5

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 distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

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

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

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

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

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