Question # 1

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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

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

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

Proton was discovered by Rutherford in

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1915

1906

1910

1920

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

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

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.

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

Electrons are

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positive charged

negatively charged

massless

neutral

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

The energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

none of these

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

How many isotopes of helium are present?

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1

2

3

4

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

Neutron was discovered in

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1915

1920

1925

1932

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

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

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

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

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