Question # 1

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

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

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

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Heavy water is made of one oxygen atom and two atoms of:

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Protium

Deuterium

Tritium

Any of these

None of these

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

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

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

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109

82

69

52

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

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

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.

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

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

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

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

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

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

Electrons are

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positive charged

negatively charged

massless

neutral

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

Neutron was discovered in

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1915

1920

1925

1932

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

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2

1

4

3

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

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

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

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