Question # 1

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

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50

100

150

200

250

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.

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

When a nucleus emits an alpha particle, it atomic mass decreased by

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2

1

4

3

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

Alfa , beta and gamma rays are emitted from a radio-active substance

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spontaneously

when it is heated

when it is exposed to light

When it interacts with the other particle

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

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

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

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isotones

isomers

isotopes

isobars

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

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

The nuclei of an element having the same charge number but different mass numbers are called:

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Neutron was discovered in

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1915

1920

1925

1932

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

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

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

Gamma rays consist of steam of

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electron

proton

photons

all of these

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

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

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

Proton was discovered by Rutherford in

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1915

1906

1910

1920

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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