Atomic Nucleus|. Practice MCQs Physics for Mdcat By Engr. Kamran Soomro | mosaicbro.com

Atomic Nucleus|. Practice MCQs Physics for Mdcat By Engr. Kamran Soomro

7 of 114 questions (Page 8 of 17)

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50 The mass of fissionable material required for self-sustaining chain reaction is called the:
Correct Answer: C
Explanation: Critical mass is the minimum amount of fissile material needed to sustain a chain reaction.
51 First atomic reactor was introduced by:
Correct Answer: C
Explanation: Enrico Fermi built the first nuclear reactor (Chicago Pile-1) in 1942.
52 The moderator used in a nuclear reactor is:
Correct Answer: D
Explanation: Graphite and heavy water are common moderators that slow neutrons to sustain fission.
53 The atomic bomb is an example of:
Correct Answer: C
Explanation: Atomic bombs rely on uncontrolled fission chain reactions.
54 Tick the correct statement:
Correct Answer: A
Explanation: Moderators (e.g., graphite) reduce neutron speeds to thermal levels for efficient fission.
55 In liquid metal fast breeder reactor, the type of uranium used is:
Correct Answer: B
Explanation: Breeder reactors use $^{238}\text{U}$ to produce fissile $^{239}\text{Pu}$.
56 The process in which two or more light nuclei combine together to form heavier nuclei with release of energy is called:
Correct Answer: B
Explanation: Fusion powers stars by combining light nuclei (e.g., hydrogen into helium).
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