Question # 1

The number if neutrons in the nucleus of ₉₂U²³⁵are

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Infinite

92

235

143

Gamma rays consist of steam of

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electron

proton

photons

all of these

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

When a nucleus emits an alpha particles, its charge number decreases by

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3

2

6

5

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

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

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

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Protactinium

Actinium

Uranium

Radium

Redon

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

The mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

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

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

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

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

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

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

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Neutrons are

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positive charge

negatively charged

massless

neutral

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

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

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

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

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

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