Question # 1

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

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

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isotones

isomers

isotopes

isobars

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

How many isotopes of helium are present?

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1

2

3

4

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

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

An alpha particle has a charge of

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+2e

-2e

-e

+3e

Charge on proton is

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1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

Gamma rays consist of steam of

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electron

proton

photons

all of these

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

Rutherford performed an experiment on nuclear reactions in:

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1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

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