Question # 1

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

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3

2

6

5

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

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

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2

1

4

3

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 most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

Electrons are

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positive charged

negatively charged

massless

neutral

How many isotopes of helium are present?

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1

2

3

4

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

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

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

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 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

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

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 mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

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

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

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

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Water

Heavy water

Carbon

Hydrocarbon

All of these

An alpha particle has a charge of

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+2e

-2e

-e

+3e

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

Nucleus of a hydrogen atom may contain:

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One neutron only

Two protons and one neutron

Two protons and two neutrons

Aany of above

One proton only

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none of these

Proton was discovered by Rutherford in

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1915

1906

1910

1920

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