Question # 1

Hydrogen atom with only one proton and one neutron in its nucleus, and one electron, is called

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deuterium

protium

tritium

none of these

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

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

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Frequency

Half life

Year

Mean life

None of these

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

How many isotopes of helium are present?

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1

2

3

4

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

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

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

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

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

Alfa , beta and gamma rays are emitted from a radio-active substance

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spontaneously

when it is heated

when it is exposed to light

When it interacts with the other particle

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

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