Question # 1

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

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

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

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

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

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

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decrease

increase

same

none of these

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

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2

1

4

3

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

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

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

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

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Frequency

Half life

Year

Mean life

None of these

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

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Physics ECAT Pre Engineering Chapter 21 Nuclear Physics Physics Online Test MCQs With Answers

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