Question # 1

Which of the following material has smaller has life

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uranium

polonium

radium

radian

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

Neutron was discovered in

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1915

1920

1925

1932

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

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

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A - Z

A + Z

Z

A

Proton was discovered by Rutherford in

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1915

1906

1910

1920

Which of the following material has longer half life

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radium

polonium

radium

uranium

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

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

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Water

Heavy water

Carbon

Hydrocarbon

All of these

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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

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

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 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

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

none of these

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

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

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fission reaction

reactor

radiation detector

fusion reaction

An alpha particle has a charge of

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+2e

-2e

-e

+3e

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

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