Question 1:

Which of the following nuclear reactions involves the splitting of a heavy nucleus into two or more lighter nuclei?

Explanation: The correct answer is A) Fission. Nuclear fission is a process in which a heavy nucleus, such as uranium-235 or plutonium-239, is split into two or more lighter nuclei.

Question 2:

Which of the following nuclear reactions involves the combining of two or more light nuclei to form a heavier nucleus?

Explanation: The correct answer is B) Fusion. Nuclear fusion is a process in which two or more light nuclei, such as hydrogen isotopes, combine to form a heavier nucleus, releasing a large amount of energy in the process.

Question 3:

Which of the following is the most common fuel used in commercial nuclear reactors?

Explanation: The correct answer is A) Uranium-235. Uranium-235 is the most common fuel used in commercial nuclear reactors due to its ability to sustain a chain reaction.

Question 4:

The half-life of a radioactive substance is defined as the time it takes for:

Explanation: The correct answer is A) Half of the radioactive atoms to decay. The half-life of a radioactive substance is the time required for half of the radioactive atoms in a sample to undergo radioactive decay.

Question 5:

The half-life of a radioactive substance:

Explanation: The correct answer is B) Remains constant regardless of the initial amount of the substance. The half-life of a radioactive substance is independent of the initial amount of the substance and remains constant throughout the radioactive decay process.