Question # 1

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

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

Which of the following material has longer half life

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radium

polonium

radium

uranium

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

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

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

The energy is found from Einstein's mass energy relation is called

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binding energy of electron

binding energy of proton

binding energy of neutron

binding energy of nucleus

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

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

Electrons are

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positive charged

negatively charged

massless

neutral

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

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

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2

1

4

3

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

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A - Z

A + Z

Z

A

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 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

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

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

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

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

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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decrease

increase

same

none of these

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

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

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Neutron was discovered in

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1915

1920

1925

1932

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

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Frequency

Half life

Year

Mean life

None of these

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

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

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