Question # 1

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

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

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

1 amu is equal to

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-34kg

1.66 x 10^-27kg

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

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50

100

150

200

250

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

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

None of these

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

Gamma rays consist of steam of

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electron

proton

photons

all of these

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.

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

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

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

In 1932 Chadwick discovered

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proton

neutron

photon

electron

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

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