Question # 1

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

Referring to the above figure, we can say that of all the elements, the most stable element is

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Phosphours

Iron

uranium

Lithium

Bismuth

Neutrons are

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positive charge

negatively charged

massless

neutral

In 1932 Chadwick discovered

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proton

neutron

photon

electron

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

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

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

Nucleus of a hydrogen atom may contain:

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One neutron only

Two protons and one neutron

Two protons and two neutrons

Aany of above

One proton only

The energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

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

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

Neutron was discovered in

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1915

1920

1925

1932

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

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

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