31) The phenomenon of radioactivity was discovered by:

a) Rutherford
b) Henry Becquerel
c) Pierre Curie
d) Madam Curie

ANSWER : Henry Becquerel

32) Co⁶⁰ is used in the treatment of:

a) Pneumonia
b) Leukaemia
c) Cancer
d) All of these

ANSWER : Cancer

33) The number of a and ß- particles emitted in the given nuclear reaction is ₉₂U²³⁸ -> ₈₂Pb²⁰⁶

a) 8a, 6ß.
b) 5a, 4ß.
c) 7a, 5ß.
d) 5a, 3ß.

ANSWER : 8a, 6ß.

34) When ₁₃Al ²⁷is bombarded with a- particles a radioactive isotope of phosphorus ₁₅P³⁰ is formed with the emission of:

a) Neutrons
b) Positrons
c) Electrons
d) Protons

ANSWER : Neutrons

35) Which isotope is used for dating archeological finding?

a) ₉₂U²³⁵

b) ₁H³

c) ₈O¹⁸

d) ₆C¹⁴

ANSWER : ₆C¹⁴

36) ………………. Particle is used to bombard ₁₃Al²⁷ to give ₁₅P³⁰ and a neutron.

a) Neutron.
b) Proton.
c) a-particle
d) ß-particle.

ANSWER : a-particle

37) Radioactive disintegration differs from a chemical change in being:

a) Nuclear process.
b) Exothermic change.
c) A spontaneous process.
d) Unimolecular first order reaction.

ANSWER : Nuclear process.

38) ……………….does not contain material particles.

a) a– rays.
b) ß– rays.
c) γ– rays.
d) Anode rays.

ANSWER : γ– rays.

39) The equipment used to carry out nuclear reaction in a controlled manner is:

a) Nuclear reactor.
b) Thermonuclear fusion.
c) Breeder reactor.
d) Cyclotron.

ANSWER : Thermonuclear fusion.

40) Which one of the following is used as neutron absorber in the nuclear reactor?

a) Cadmium
b) Deuterium.
c) Water.
d) All of these.

ANSWER : Cadmium    

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