Question # 1

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

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Protactinium

Actinium

Uranium

Radium

Redon

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

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 total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

Radiation detector are used to

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measure intensity of radiation

measure energy of radiation

difference between different types of radiation

all the above

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

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 neutrons in the nucleous is

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A - Z

A

Z

A + Z

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

An alpha particle has a charge of

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+2e

-2e

-e

+3e

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

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

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

Which of the following material has longer half life

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radium

polonium

radium

uranium

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

Referring to the above figure, we can say that of all the elements, the most stable element is

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Phosphours

Iron

uranium

Lithium

Bismuth

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

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

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

How many isotopes of helium are present?

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1

2

3

4

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 chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

The number of isotopes of hydrogen are

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2

1

3

4

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

Electrons are

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positive charged

negatively charged

massless

neutral

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

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

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photon

position

antiproton

antineutrino

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

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