Question # 1

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

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

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

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

Which of the following material has longer half life

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radium

polonium

radium

uranium

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

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

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

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

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

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 nuclei of an element having the same charge number but different mass numbers are called:

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

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

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

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

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Alfa , beta and gamma rays are emitted from a radio-active substance

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spontaneously

when it is heated

when it is exposed to light

When it interacts with the other particle

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

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

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

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

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

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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

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