Question # 1

Which of the following material has longer half life

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radium

polonium

radium

uranium

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

The energy is found from Einstein's mass energy relation is called

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binding energy of electron

binding energy of proton

binding energy of neutron

binding energy of nucleus

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

Neon gas have three isotopes whose atomic numbers are

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20, 24 , 23

20, 21 , 22

20, 19 , 21

none of these

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

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

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

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

Charge on proton is

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1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

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

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

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

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

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

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 isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

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

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isotones

isomers

isotopes

isobars

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

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

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

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Protactinium

Actinium

Uranium

Radium

Redon

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

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 half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

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