Question # 1

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

Proton was discovered by Rutherford in

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1915

1906

1910

1920

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

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

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

In radio-active decay, the original element which disintegrate to another element is called

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element

daughter element

parent element

none of these

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

Examples of moderators used in a fission reactor is/are:

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Water

Heavy water

Carbon

Hydrocarbon

All of these

Electrons are

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positive charged

negatively charged

massless

neutral

Neutron was discovered in

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1915

1920

1925

1932

An alpha particle has a charge of

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+2e

-2e

-e

+3e

1 amu is equal to

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-34kg

1.66 x 10^-27kg

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

Referring to the above figure, we can say that of all the elements, the most stable element is

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Phosphours

Iron

uranium

Lithium

Bismuth

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

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