161. Heat is generated in a nuclear reactor (thermal) by
combustion of a nuclear fuel e.g. uranium.
fusion of atoms of uranium.
absorption of neutrons in uranium atoms.
fission of U-235 by neutrons.
✅ The correct answer is option D.
Nuclear Power Engineering MCQs
162. Molten sodium (as a coolant in fast breeder reactor)
can’t attain high temperature at normal pressure.
is not at all corrosive, even at a higher temperature.
is highly radioactive at elevated temperatures and can cause explosion, when it comes in contact with air or water.
none of these
✅ The correct answer is option C.
163. Fuel for a fast breeder reactor is
plutonium
uranium
radium
neptunium
✅ The correct answer is option A.
164. Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor ?
Molten sodium cooled
CO2 gas cooled
Pressurised water
Boiling water
✅ The correct answer is option D.
165. If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same istotope will be __________ days.
5
10
20
30
✅ The correct answer is option B.
166. Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235.
1
2
3
7
✅ The correct answer is option C.
167. How many atoms are present in one gm-atom of an element ?
2 x 1023
6 x 1023
6 x 1032
5 x 105
✅ The correct answer is option B.
168. Which of the following may be used to measure the rate of nuclear disintegration?
Geiger-Muller Counter
Cyclotron
Cold chamber
Mass spectrograph
✅ The correct answer is option A.
169. In a nuclear explosion, the energy is released primarily in the form of __________ energy-
potential
thermal
kinetic
electrical
✅ The correct answer is option C.
170. A radioactive substance does not emit
α-ray
proton
position
β-ray
✅ The correct answer is option B.