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 : 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 : 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
Last Answer : (C) 3
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 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 : 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 : Enriched uranium means that, it contains (A) More than 0.71% of U-235 (B) Only fertile material (C) Only fissile material (D) No impurities
Last Answer : (A) More than 0.71% of U-235
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 : 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 : 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 : 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 : 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 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 : 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 : 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 : 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 : 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
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 : 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 : 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 : 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 : 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 : 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 : 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 : (A) Nuclear isomers have same atomic number and same mass number but with different radioactive properties. `U_((A))` and `U_((Z))` are nuclear isomer
Last Answer : (A) Nuclear isomers have same atomic number and same mass number but with different radioactive properties. `U_ ... both (A) and (R ) are incorrect.
Description : The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are: (A) 1 (B) 2 (C) 3 (D) 0
Last Answer : (B) 2
Description : The activity of pure hydrogen gas at 1000°C and 5 atm pressure (A) Is always less than 1 (B) Is always greater than 1 (C) Can be 5 (D) Depends on the choice of the standard state
Last Answer : (D) Depends on the choice of the standard state
Description : A system has internal energy equal to `U_(1), 450J` of heat is taken out of it and `600J` of work is done on it. The final enegry of the system will b
Last Answer : A system has internal energy equal to `U_(1), 450J` of heat is taken out of it and `600J` of work is done ... 1050)` C. `(E_(1)-150)` D. None of these
Description : The mineral monazite is a rich source of thorium, available in large quantity in kerala. A typical monazite sample contains 9% `ThO_(2)` and 0.35% `U_
Last Answer : The mineral monazite is a rich source of thorium, available in large quantity in kerala. A typical monazite sample ... B. 0.266 C. 0.366 D. 0.466
Description : 48 g of `SO_(3)` , 12.8 g of `SO_(2)` and 9.6 g of `O_(2)` are present in one litre . The respective active masses will be
Last Answer : 48 g of `SO_(3)` , 12.8 g of `SO_(2)` and 9.6 g of `O_(2)` are present in one litre . The respective active ... .6 , 0.4 and 0.2 D. 1.0 , 0.5 and 1.5
Description : Heating 235 g of water from 22.6 degrees C to 94.4 degrees C in a microwave oven requires 7.06x10^4 J of energy. If the microwave frequency is 2.88x10^10 Hz, how many quanta are required to supply the 7.06x10^4 J?
Last Answer : answer:Guidelines. I don’t mean to be the bearer of bad news…
Description : A heterogeneous reactor is the one, in which the moderator and the (A) Coolant are different materials (B) Coolant are present in different phases (e.g., heavy water and graphite) (C) Fuel are present in different phases (e.g. uranium and heavy water) (D) None of these
Last Answer : (C) Fuel are present in different phases (e.g. uranium and heavy water
Description : An 80-year-old woman has a three month history of progressive numbness and unsteadiness of her gait. On examination, there is a mild spastic paraparesis, with brisk knee reflexes, ankle ... dorsal meningioma C. multiple sclerosis D. subacute combined degeneration of the cord E. tabes dorsalis
Last Answer : Ans: B
Description : (A) Cation carriers, e.g., `H-Br,Cl-OH` and `Br-Br` and oxidising agents such as `O_(3)` and `R-O-O-R`, etc. act as electrophilic reagents. (R) Electr
Last Answer : (A) Cation carriers, e.g., `H-Br,Cl-OH` and `Br-Br` and oxidising agents such as `O_(3)` and ... incorrect. D. IF (A) is incorrect but (R) is correct.
Description : Is 9.24 greater than 9.235?
Last Answer : yes 0.005 greater
Description : 1.5 mol of `O_(2)` combines with Mg to form oxide MgO. The mass of Mg (at. Mass 24) that has combined is
Last Answer : 1.5 mol of `O_(2)` combines with Mg to form oxide MgO. The mass of Mg (at. Mass 24) that has combined is A. 72 g B. 36 g C. 24 g D. 94 g
Description : (A) The reduction reaction, `Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr, DeltaG^(0)=-421KJ` is not possible at room temperature (R ) Certain amount of activat
Last Answer : (A) The reduction reaction, `Cr_(2)O_(3)+2Al to Al_(2)O_(3)+2Cr, DeltaG^(0)=-421KJ` is not ... incorrect D. If (A) is incorrect but (R ) is correct
Description : The radioactivity of uranium mineras is usually more in comparison to pure uranium. This is due to presence of … in the mineral.
Last Answer : The radioactivity of uranium mineras is usually more in comparison to pure uranium. This is due to ... . actinium B. thorium C. radium D. plutonium
Description : Which one of the following statements concerning glucose-6-phosphate dehydrogenase deficiency is correct? (A) Young R.B.Cs, particularly reticulocytes, contain the highest enzyme activity cells show less enzyme ... PD gene (D) G-6-PD deficiency is precipitated by ingestion of drugs such as aspirin
Last Answer : Answer : A
Description : Calculate the energy released by fission of 1 g of `._(92)^(235)U`, assuming that an energy of 200 MeV is released by fission of each atom of `.^(235)
Last Answer : Calculate the energy released by fission of 1 g of `._(92)^(235)U`, assuming that an energy of 200 MeV is ... `= 6.023 xx 10^(26) kg mol^(-1)`)
Description : An "International Unit" of penicillin activity established in 1944 is amount of penicillin equivalent to A.0.6 micrograms of crystalline penicillin G of about 98% purity B.0.6 micrograms of crystalline ... G of about 98% purity D.0.8 micrograms of crystalline penicillin G of about 90% purity
Last Answer : A.0.6 micrograms of crystalline penicillin G of about 98% purity
Description : Aluminium is obtained by the electrolysis of pure of `Al_(2)O_(3)` dissolved in
Last Answer : Aluminium is obtained by the electrolysis of pure of `Al_(2)O_(3)` dissolved in A. Alumina B. Bauxite C. Cryolite D. Felspar
Description : The amount of benzene present in pure Benzol is about __________ percent. (A) 30 (B) 50 (C) 70 (D) 90
Last Answer : (C) 70
Description : 0.6 g of carbon was burnt in the air to form `CO_(2)`. The number of molecules of `CO_(2)` introduced into the will be : `C+O_(2)toCO_(2)`
Last Answer : 0.6 g of carbon was burnt in the air to form `CO_(2)`. The number of molecules of `CO_(2)` introduced into ... C. `6.02xx10^(22)` D. `3.01xx10^(22)`
Description : At STP , for complete combustion of 3 g `C_(2)H_(6)` the required volume of `O_(2)` will be -
Last Answer : At STP , for complete combustion of 3 g `C_(2)H_(6)` the required volume of `O_(2)` will be - A. 78. 4 L B. 7. 84 L C. 2. 78 L D. 6. 23 L
Description : Number of acidic oxides among the following is: (a) `N_(2)O` (b) `NO` (c) `N_(2)O_(3)` (d) `N_(2)O_(4)` (e) `N_(2)O_(5)` (f) `P_(4)O_(6)` (g) `P_(4)O_
Last Answer : Number of acidic oxides among the following is: (a) `N_(2)O` (b) `NO` (c) `N_(2)O_(3)` (d) `N_(2)O_(4)` (e ... (h) `SO_(3)` (i) `B_(2)O_(3)` (j) `CO`