Question # 1

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

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

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

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

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

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

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photon

position

antiproton

antineutrino

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

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

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

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

Electrons are

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positive charged

negatively charged

massless

neutral

Neutron was discovered in

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1915

1920

1925

1932

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

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

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

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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