Question # 1

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

The missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none of these

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

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

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

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

Binding energy per nucleus is

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greater for heavy nucleus

least for heavy nucleus

greatest for light nuclei

decreases for medium weight niclei

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

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