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- Question
The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be __________ percent.
Options- A. 3.125
- B. 6.25
- C. 12.50
- D. 25
- Correct Answer
- 6.25
- 1. Heat is generated in a nuclear reactor (thermal) by
Options- A. combustion of a nuclear fuel e.g. uranium.
- B. fusion of atoms of uranium.
- C. absorption of neutrons in uranium atoms.
- D. fission of U-235 by neutrons. Discuss
- 2. The atomic number of an element is equal to the number of __________ present in its atom.
Options- A. neutrons
- B. electrons
- C. protons
- D. either (b) or (c) Discuss
- 3. Fast breeder reactors do not
Options- A. use Th-232 as fissile fuel.
- B. convert fertile material to fissile material.
- C. use fast neutrons for fission.
- D. use molten sodium as coolant. Discuss
- 4. In a nuclear explosion, the energy is released primarily in the form of __________ energy-
Options- A. potential
- B. thermal
- C. kinetic
- D. electrical Discuss
- 5. Which of the following is artificially produced as it does not occur in nature?
Options- A. Uranium-235
- B. Uranium-233
- C. Plutonium-239
- D. Both (b) and (c) Discuss
- 6. An electron has a mass that is approximately __________ that of the proton.
Options- A. 1836 (approximately)
- B. 1/1836 (approximately)
- C. 1
- D. ? Discuss
- 7. The time taken for a radioactive element to reduce to 50% of its original weight is __________ years, if its half life period is 12 years.
Options- A. 24
- B. 18
- C. 6
- D. 36 Discuss
- 8. Final product of uranium extraction plant at Jadugoda (Bihar) is
Options- A. uranium
- B. uranium oxide
- C. uranium carbide
- D. magnesium diuranate Discuss
- 9. Ordinary water is not used as a moderator because, it
Options- A. has a low absorption cross-section.
- B. has a low scattering cross-section.
- C. absorbs neutrons.
- D. does not absorb neutrons. Discuss
- 10. A boiling water reactor is the one, in which the
Options- A. coolant water is allowed to boil in the core of the reactor.
- B. coolant water, after being heated in the reactor core, generates steam in a boiler.
- C. pressurised water is pumped into the core.
- D. fuel and the coolant are thoroughly mixed to form a homogeneous solution. Discuss
Nuclear Power Engineering problems
Search Results
Correct Answer: fission of U-235 by neutrons.
Correct Answer: either (b) or (c)
Correct Answer: use Th-232 as fissile fuel.
Correct Answer: kinetic
Correct Answer: Both (b) and (c)
Correct Answer: 1/1836 (approximately)
Explanation:
An electron has a mass that is approximately 1/1836.15267245(75) that of the proton.
Correct Answer: 18
Correct Answer: magnesium diuranate
Correct Answer: absorbs neutrons.
Correct Answer: coolant water is allowed to boil in the core of the reactor.
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