Question # 1

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

An alpha particle has a charge of

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+2e

-2e

-e

+3e

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

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

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

Three quarks make:

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An electron

A meson

A baryon

A photon

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 his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

Neutrons are

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positive charge

negatively charged

massless

neutral

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

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

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

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

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