Question # 1

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Gamma rays consist of steam of

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electron

proton

photons

all of these

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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decrease

increase

same

none of these

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

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

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

An alpha particle has a charge of

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+2e

-2e

-e

+3e

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

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Proton was discovered by Rutherford in

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1915

1906

1910

1920

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

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

Which of the following material has smaller has life

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uranium

polonium

radium

radian

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

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A - Z

A + Z

Z

A

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

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

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

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

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

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

Neon gas have three isotopes whose atomic numbers are

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20, 24 , 23

20, 21 , 22

20, 19 , 21

none of these

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