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

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

Which of the following material has longer half life

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radium

polonium

radium

uranium

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

Electrons are

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positive charged

negatively charged

massless

neutral

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

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

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

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.

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

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

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

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 unit of decay constant is

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sex

sec²

sec^-1

sec^-2

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

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

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

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

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

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

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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