Question # 1

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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 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

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

Binding energy per nucleus is

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greater for heavy nucleus

least for heavy nucleus

greatest for light nuclei

decreases for medium weight niclei

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

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

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

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

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 number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

In 1932 Chadwick discovered

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proton

neutron

photon

electron

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

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

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A - Z

A + Z

Z

A

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

The number of isotopes of hydrogen are

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2

1

3

4

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

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

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

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

The isotope/s of hydrogen is /are:

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Protium

Deuterium

Tritium

Both (A) and (B)

All of these

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