Question # 1

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

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

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3

2

6

5

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

Radiation detector are used to

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measure intensity of radiation

measure energy of radiation

difference between different types of radiation

all the above

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

Rutherford performed an experiment on nuclear reactions in:

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1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

An alpha particle has a charge of

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+2e

-2e

-e

+3e

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

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

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

Heavy water is made of one oxygen atom and two atoms of:

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Protium

Deuterium

Tritium

Any of these

None of these

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