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

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

Neutrons are

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positive charge

negatively charged

massless

neutral

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

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

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

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

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

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

Neutron was discovered in

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1915

1920

1925

1932

Binding energy per nucleus is

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greater for heavy nucleus

least for heavy nucleus

greatest for light nuclei

decreases for medium weight niclei

The number of isotopes of hydrogen are

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2

1

3

4

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

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

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Protactinium

Actinium

Uranium

Radium

Redon

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

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

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

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

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

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

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

Nucleus of a hydrogen atom may contain:

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One neutron only

Two protons and one neutron

Two protons and two neutrons

Aany of above

One proton only

How many isotopes of helium are present?

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1

2

3

4

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

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

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109

82

69

52

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

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