Question # 1

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

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

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

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 missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

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

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

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

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

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