Discussion
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- Question
The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235 , followed by nuclear fission is
Options- A. 1
- B. 2
- C. 3
- D. 4
- Correct Answer
- 3
- 1. The time required for half of the __________ of a radioactive isotope to decay is called its half life.
Options- A. nuclei
- B. electrons
- C. protons
- D. neutrons Discuss
- 2. The ratio of atomic radius to its nuclear radius is about
Options- A. 105
- B. 108
- C. 1012
- D. 1015 Discuss
- 3. The 92U238 emits an a-particle. The product is
Options- A. 90U234
- B. 90U238
- C. 90U236
- D. 92U236 Discuss
- 4. The function of moderators in nuclear reactor is to
Options- A. slow down the secondary neutrons.
- B. absorb the secondary neutrons.
- C. control the chain reaction.
- D. none of these. Discuss
- 5. A moderator __________ the neutrons.
Options- A. slows down
- B. absorbs
- C. accelerates
- D. reflects Discuss
- 6. Emission of ?-particles during radioactive decay of a substance is from
Options- A. innermost shell
- B. nucleus
- C. outermost shell
- D. none of these Discuss
- 7. Pick out the wrong statement.
Options- A. The nucleus of a hydrogen atom is identical with a proton.
- B. A, ?-ray particle is identical with an electron.
- C. Mass of an electron is about 1/1800th of the lightest nucleus.
- D. Positron is heavier than a proton. Discuss
- 8. Which of the following types of nuclear reactors is most prone to radioactive hazards?
Options- A. Pressurised water reactor
- B. Gas cooled reactor
- C. Molten sodium cooled reactor
- D. Boiling water reactor Discuss
- 9. A fast breeder reactor employs
Options- A. graphite as moderator.
- B. water as coolant.
- C. molten sodium as coolant as well as moderator.
- D. U-235 as fuel. Discuss
- 10. Which of the following ores contains maximum percentage of uranium?
Options- A. Carnotite
- B. Thorium.
- C. Rescolite
- D. Pitchblende Discuss
Nuclear Power Engineering problems
Search Results
Correct Answer: nuclei
Correct Answer: 105
Correct Answer: 90U234
Correct Answer: slow down the secondary neutrons.
Correct Answer: slows down
Correct Answer: nucleus
Correct Answer: Positron is heavier than a proton.
Correct Answer: Boiling water reactor
Correct Answer: U-235 as fuel.
Correct Answer: Pitchblende
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