Question # 1

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

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

The range of particle depends upon the factor

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charge, mass and energy of particle

density of medium

ionization potential of the atoms

all the above

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

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decrease

increase

same

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

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

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

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

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

An alpha particle has a charge of

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+2e

-2e

-e

+3e

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

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

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