Question # 1

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

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

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

Which of the following material has longer half life

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radium

polonium

radium

uranium

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

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

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

Charge on proton is

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1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

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

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600

7000

5000

15000

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

Neutron was discovered in

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1915

1920

1925

1932

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

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3

2

6

5

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

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

Binding energy per nucleus is

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greater for heavy nucleus

least for heavy nucleus

greatest for light nuclei

decreases for medium weight niclei

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

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

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

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 range of particle depends upon the factor

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charge, mass and energy of particle

density of medium

ionization potential of the atoms

all the above

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

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

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Water

Heavy water

Carbon

Hydrocarbon

All of these

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