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1) Each a- particle has the mass:
a) Equal to that of hydrogen.
b) Nearly four times that of hydrogen atom.
c) Half of the hydrogen atom.
d) None of these.
ANSWER : Nearly four times that of hydrogen atom.
2) Which among the following has the highest penetrating power?
a) γ – rays
b) ß – rays
c) a – rays
d) cathode rays
ANSWER : γ – rays
3) ß rays possess:
a) High momentum and low kinetic energy.
b) Low momentum and high kinetic energy.
c) Low momentum and kinetic energy.
d) High momentum and kinetic energy.
ANSWER : Low momentum and kinetic energy.
4) Atoms of different elements containing the same number of neutrons but
different number of total nucleons is known as:
a) Isotones
b) Isodiaphers
c) Isotopes
d) Isosterism
ANSWER : Isotones
5) The radius of the nucleus of any atom is related to its mass number
according to the relation:
a) r = R0A
b) r = ½ R0A
c) r = R0A ½
d) r = R0A1/3
ANSWER : r = R0A1/3
6) When a ß- particle is emitted, the new element formed is displaced ………………
position to the right in the periodic table than that of the parent element.
a) one
b) two
c) four
d) None of these.
ANSWER : one
7) When positron is emitted by a radioactive nucleus then:
a) Atomic number remains the same.
b) Atomic number increases by 1 unit.
c) Atomic number decreases by 1 unit.
d) Atomic number increases by 2 units.
ANSWER : Atomic number decreases by 1 unit.
8) Which among the following is a false statement?
a) The projectile should have light weight.
b) The projectile should have low velocity.
c) Both a and b
d) None of these.
ANSWER : The projectile should have low velocity.
9) The process of conversion of stable isotope of one element into isotope
of another element is known as:
a) Artificial radioactivity.
b) Artificial transmutation.
c) Natural radioactivity.
d) Induced radioactivity.
ANSWER : Artificial transmutation.
10) The velocity of a– rays is found in the range of:
a) 1/10th to 1/20th of that of light.
b) 1/20th to 1/30th of that of light.
c) 1/5th to 1/10th of that of light.
d) Both a and c.
ANSWER : 1/10th to 1/20th of that of light.
Part 1
Part 2 Part 3 Part 4
Part 5
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