Description : Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235. (A) 1 (B) 2 (C) 3 (D) 7
Last Answer : (C) 3
Description : Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material). (A) 15 (B) 45 (C) 65 (D) 85
Last Answer : (D) 85
Description : Thorium-232 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material. (A) Thorium-233 (B) Uranium-235 (C) Uranium-233 (D) Plutonium-239
Last Answer : (C) Uranium-233
Description : Which of the following is a non-fissile material? (A) Plutonium-239 (B) Uranium-235 (C) Uranium-233 (D) Thorium-232
Last Answer : (D) Thorium-232
Description : U-235 content in enriched uranium, that is normally used in power reactors (e.g., at Tarapur atomic power plant), is about __________ percent. (A) 85 (B) 50 (C) 3 (D) 97
Description : Candu reactor is a __________ nuclear reactor. (A) Natural uranium fuelled heavy water cooled & moderated (B) Highly enriched uranium (85% U-235) fuelled (C) Homogeneous (D) Fast breeder
Last Answer : (A) Natural uranium fuelled heavy water cooled & moderated
Description : Liquid metal (e.g., molten sodium) is preferred as a coolant in case of a/an __________ reactor. (A) Homogeneous (B) Graphite moderated (C) Fast breeder (D) Enriched uranium (3% U-235) fuelled
Last Answer : (C) Fast breeder
Description : Which is not a fissile nuclear material? (A) U-233 (B) U-235 (C) U-238 (D) Pu-239
Last Answer : (C) U-238
Description : A fast breeder reactor (A) Utilises fast neutrons for causing fission (B) Converts fertile material (e.g., U-238) into fissile material (Pu-239) (C) Normally employs molten sodium as coolant (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Quantity of fissionable material (i.e. U-235) in natural uranium is __________ percent. (A) 0.71 (B) 6.31 (C) 99.29 (D) 12.73
Last Answer : (A) 0.71
Description : Fast breeder reactors do not (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
Last Answer : (A) Use Th-232 as fissile fuel
Description : A fertile material is the one, which can be (A) Converted into fissile material on absorption of neutron (B) Fissioned by slow (thermal) neutrons (C) Fissioned by fast neutrons
Last Answer : (A) Converted into fissile material on absorption of neutron
Description : The main purpose of control rod in a nuclear reactor is to control the (A) Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission (B) ... radiation (C) Conversion of fissile material into fertile material (D) Velocity of the secondary neutrons
Last Answer : (A) Chain reaction and hence the power output by regulating the number of secondary neutrons causing fission
Description : Fast breeder test reactor at Kalpakkam (INDIA) is designed for using (A) Thorium as a fertile material (B) U-238 as a fertile material (C) Helium as a coolant (D) Uranium ore directly as a fuel
Last Answer : (A) Thorium as a fertile material
Description : In a breeder reactor --------- a. amount of fuel decreases b. amount of fuel increases c. amount of fuelremain same d. fissile material is converted in to fertile
Last Answer : b. amount of fuel increases
Description : Which is a fertile nuclear fuel? (A) U-233 (B) U-235 (C) Pu-239 (D) Th-232
Last Answer : (D) Th-232
Description : If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor. (A) Critical (B) Breeder (C) Fertile (D) Heterogeneous
Last Answer : (B) Breeder
Description : Let us consider emission of `alpha`particle from uranium nucleus: `._(92)^(235)U - ._(2)He^(4) to ._(90)Th^(231)` `{:(e = 92, e = 0, e = 90),(p = 92,
Last Answer : Let us consider emission of `alpha`particle from uranium nucleus: `._(92)^(235)U - ._( ... evolve energy C. annihilation D. absorption in the nucleus
Description : Heat is generated in a nuclear reactor (thermal) by (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
Last Answer : (D) Fission of U-235 by neutrons
Description : Which of the following isotopes is not present in natural uranium? (A) U-238 (B) U-234 (C) U-235 (D) U-232
Last Answer : (D) U-232
Description : Enrichment of uranium is done to increase the concentration of__________ in the natural uranium. (A) U-238 (B) U-233 (C) U-235 (D) Pu-239
Last Answer : (C) U-235
Description : Explain difference between fissile and fertile materials.
Last Answer : The materials which can give nuclear fission e.g. U 35, Pu 39, U 33 are fissile materi¬als. Fertile material itself is not fissionable, but it can be converted to a fissionable material by irradiation of neutrons in a nuclear reactor.
Description : Natural uranium consists of `.^(235)U`:
Last Answer : Natural uranium consists of `.^(235)U`: A. 0.99 B. 0.5 C. 0.1 D. 0.007
Description : A uranium nucleus `.^(235)U` liberates 200 MeV per fission 1.5 kg of uranium reacts during explosion of a uranium bomb. What is the mass of an equival
Last Answer : A uranium nucleus `.^(235)U` liberates 200 MeV per fission 1.5 kg of uranium reacts during explosion of a uranium ... TNT is `4.1 xx 10^(6) J//kg` ?
Description : The isotope of Uranium used in atomic reactors is – (1) U^235 (2) (2) U^236 (3) U^237 (4) U^232
Last Answer : (1) U^235 Explanation: A nuclear reactor is a device to initiate and control a sustained nuclear chain reaction. Most commonly they are used for generating electricity and for the propulsion of ships ... fissile atomic nucleus such as U235 or U239 absorbs a neutron, it may undergo nuclear fission.
Description : The isotope of Uranium capable of sustaining chain reaction is - (1) U-235 (2) U-238 (3) U-239 (4) N.O.T.
Last Answer : (1) U-235 Explanation: Uranium is a chemical element with symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table.
Description : Radioactive isotope of Uranium used in Nuclear Bomb is ? A.92 U 235 (Answer) B.92 U 234 C. 92 U 233 D. 92 U 238
Last Answer : A.92 U 235 (Answer)
Description : Which of the following nuclear materials is fissile? (A) Uranium-238 (B) Thorium-232 (C) Plutonium-239 (D) None of these
Last Answer : (C) Plutonium-239
Description : Which of the following pairs is not correctly matched? (A) Uranium - 233 : Fertile material (B) Binding energy : Mass defect (C) Scattering: Absorption cross-section (D) Number of nucleons : Mass number
Last Answer : (A) Uranium - 233 : Fertile material
Description : Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is __________ percent. (A) < 37% (B) > 71% (C) In between 37 & 71% (D) None of these
Last Answer : (C) In between 37 & 71%
Description : Thorium-232 is converted into uranium-233 in a/an __________ nuclear reactor. (A) Thermal (B) Fast breeder (C) Heavy water moderated (D) Enriched uranium
Last Answer : (B) Fast breeder
Description : Nuclear fuel usually used in a Boiling Water Reactor (BWR) is (A) Plutonium (B) Enriched uranium (C) Natural uranium (D) Thorium
Last Answer : (B) Enriched uranium
Description : The most commonly used nuclear fuel in boiling water reactor is (A) Enriched uranium (B) Natural uranium (C) Plutonium
Last Answer : (A) Enriched uranium
Description : Out of the following, nucleus of __________ atom contains the largest number of neutrons. (A) U-235 (B) U-238 (C) U-239 (D) Pu-239
Last Answer : (C) U-239
Description : Which of the following is artificially produced as it does not occur in nature? (A) Uranium-235 (B) Uranium-233 (C) Plutonium-239 (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
Description : Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV. (A) 20 (B) 200 (C) 500 (D) 2000
Last Answer : (B) 200
Description : Enrichment of uranium by gaseous diffusion relies on the fact that uranium-235 diffuses through holes in the barriers more readily than uranium-238 does because uranium-235 is: w) a different chemical ... x) a different wavelength. y) resistant to magnetism. z) slightly lighter than uranium-238.
Last Answer : ANSWER: Z -- SLIGHTLY LIGHTER THAN URANIUM-238.
Description : (A) The activity of 1 g pure uranium-235 will be greater than the same amount present in `U_(3) O_(6)` (R ) In the combined state, the activity of the
Last Answer : (A) The activity of 1 g pure uranium-235 will be greater than the same amount present in `U_(3) O_(6)` ... . D. If both (A) and (R ) are incorrect.
Description : This natural fiber obtained from the stems of a plant of the nettle family has found popularity in modern fibers with a high wet strength, absorbent but dries quickly, it can be spun or woven, has a high rot ... a source of heat or power? w) Plutonium-238 x) Strontium-90 y) Cesium-137 z) Uranium-235
Last Answer : ANSWER: W -- PLUTONIUM-238
Description : Because uranium 235 isn't found naturally in large quantities, engineers increase its concentration in nuclear fuel so that a chain reaction is more likely to occur. What is the name of this process?
Last Answer : Enrichment
Description : Which of the following is not, a fertile material? (A) Th-232 (B) U-238 (C) U-233 (D) None of these
Last Answer : (C) U-233
Description : Which type of Uranium is used in the fission process? A. Uranium – 234 B. Uranium - 235 C. Uranium - 236 D. Uranium - 237
Last Answer : ANSWER: B
Description : A fast reactor uses: w) an extremely short time to get to the maximum operating reactivity. x) uranium-235 as fuel. y) heavy water as a coolant. z) essentially unmoderated neutrons.
Last Answer : ANSWER: Z -- ESSENTIALLY UNMODERATED NEUTRONS.
Description : In a breeder reactor, new fuel is formed as non-fuel uranium-238 absorbs a neutron and ultimately becomes which of the following fissionable atoms: w) uranium-235 x) plutonium-239 y) uranium-239 z) neptunium-239
Last Answer : ANSWER: X -- PLUTONIUM-239
Description : The correct starting material and product of different disintegration series `"is"//"are"` a)`Th^(232), Pb^(208)` b)`Np^(237),Bi^(209)` c)`U^(235),Pb^
Last Answer : The correct starting material and product of different disintegration series `"is"//"are"` a)`Th^(232), Pb^(208)` ... )Pb` D. `.^(237)Np, .^(209)Bi`
Description : Critical mass" is the minimum mass of nuclear fissile material required for the (A) Sustainment of chain reaction (B) Power generation on commercial scale (C) Economic power generation (D) None of these
Last Answer : (A) Sustainment of chain reaction
Description : A homogeneous reactor is the one, in which the (A) Fissile atoms are evenly distributed throughout the mass of nuclear reactor (B) Same substance (e.g. heavy water) is used as moderator & coolant (C) The fuel and the moderator is mixed to form a homogeneous material (D) All (A), (B) and (C)
Last Answer : (C) The fuel and the moderator is mixed to form a homogeneous material