Question # 1

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

The energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

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

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

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

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 chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

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

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

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

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

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decrease

increase

same

none of these

1 amu is equal to

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-34kg

1.66 x 10^-27kg

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