Question # 1

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

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

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

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 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

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

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

1 amu is equal to.

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-24kg

1.66 x 10^-27kg

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

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

Which of the following material has smaller has life

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uranium

polonium

radium

radian

An alpha particle has a charge of

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+2e

-2e

-e

+3e

Which of the following material has longer half life

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radium

polonium

radium

uranium

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

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

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

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

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

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

Electrons are

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positive charged

negatively charged

massless

neutral

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

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

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

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

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