Question # 1

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

The energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

Neutrons are

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positive charge

negatively charged

massless

neutral

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

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

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

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

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

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

In 1932 Chadwick discovered

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proton

neutron

photon

electron

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

The number of isotopes of hydrogen are

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2

1

3

4

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

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

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

None of these

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

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.

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

Proton was discovered by Rutherford in

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1915

1906

1910

1920

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

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

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

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