Question # 1

In 1932 Chadwick discovered

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proton

neutron

photon

electron

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

Electrons are

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positive charged

negatively charged

massless

neutral

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

Which of the following material has longer half life

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radium

polonium

radium

uranium

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

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 consists of

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proton and neutron

protons and electron

electron and neutron

protons only

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

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

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

Gamma rays consist of steam of

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electron

proton

photons

all of these

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

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

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Protactinium

Actinium

Uranium

Radium

Redon

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

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

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

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

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

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

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

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Frequency

Half life

Year

Mean life

None of these

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

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