Question # 1

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

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

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

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decrease

increase

same

none of these

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

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

Proton was discovered by Rutherford in

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1915

1906

1910

1920

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

How many isotopes of helium are present?

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1

2

3

4

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

When a nucleus emits an alpha particle, it atomic mass decreased by

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2

1

4

3

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

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

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

1 amu is equal to.

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-24kg

1.66 x 10^-27kg

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

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

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

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

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

The number of isotopes of hydrogen are

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2

1

3

4

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

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

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

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

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

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

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 diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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