Description : Atomic explosion is triggered by - (1) thermo nuclear reaction (2) chemical reaction (3) controlled chain reaction (4) uncontrolled chain reaction
Last Answer : (4) uncontrolled chain reaction Explanation: During an uncontrolled nuclear chain reaction such as atomic explosion, a radioactive substance gives off energy at a rate that increases rapidly with time, ... its neighbors, in turn setting off other atoms; thus, producing large amounts of energy.
Description : Which of the following can be used to absorb neutrons to control the chain reaction during nuclear fission? (1) Boron (2) Heavy water (3) Uranium (4) Plutonium
Last Answer : (1) Boron Explanation: Boron shielding is used as a control for nuclear reactors, taking advantage of its high cross-section for neutron capture. Elemental boron is rare and ... aluminium. Crystalline boron is chemicallyinert and resistant to attack by boiling hydrofluoric or hydrochloric acid.
Description : wo elements which are used to absorb neutrons to control the chain reaction during nuclear fission are - (1) Boron and Cadmium (2) Boron and Plutonium (3) Cadmium and Uranium (4) Uranium and Boron
Last Answer : (1) Boron and Cadmium Explanation: Since the continued chain reaction of a nuclear fission reactor depends upon at least one neutron from each fission being absorbed by another fissionable nucleus, the ... and then the control rods are slowly lifted until a chain reaction can just be sustained.
Description : Atomic explosion is triggered by (1) thermo nuclear reaction (2) chemical reaction (3) controlled chain reaction (4) uncontrolled chain reaction
Last Answer : uncontrolled chain reaction
Description : Which of the following can be used to absorb neutrons to control the chain reaction during nuclear fission ? (1) Boron (2) Heavy water (3) Uranium (4) Plutonium
Last Answer : Boron
Description : Two elements which are used to absorb neutrons to control the chain reaction during nuclear fission are (1) Boron and Cadmium (2) Boron and Plutonium (3) Cadmium and Uranium (4) Uranium and Boron
Last Answer : Boron and Cadmium
Last Answer : Once a nuclear reaction is started, it does not need any energy to keep it going, is it called a nuclear chain reaction ?
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 : A nuclear reactor harnesses nuclear energy by A. Nuclear fusion B. Spontaneous fission C. Uncontrolled chain reaction D. Controlled chain reaction
Last Answer : ANSWER: D
Description : What is the difference between nuclear fission and fission chain reaction.
Last Answer : The process of splitting of nucleus into two almost equal fragments accompanied by re¬lease of heat is nuclear fission. Self sustained, continuing, sequence of fission reactions in a con¬trolled manner is fission chain reaction.
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 : Critical mass" is the minimum mass of nuclear fissile materialrequired for the (A) Sustainment of chain reaction (B) Power generation on commercial scale (C) Economic power generation (D) None of these
Description : The function of moderators in nuclear reactor is to (A) Slow down the secondary neutrons (B) Absorb the secondary neutrons (C) Control the chain reaction (D) None of these
Last Answer : (A) Slow down the secondary neutrons
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 : The two elements which are used to absorb the neutrons in nuclear fission during chain reaction
Last Answer : Boran and Cadmium
Description : Leó Szilárd drew inspiration from whose novel The World Set Free while developing the idea of nuclear chain reaction? Incidentally, he is also known for the catchphrase “The war to end war” associated with World War I.
Last Answer : H.G. Wells.
Description : The first controlled nuclear chain reaction took place in what year? w) 1895 x) 1910 y) 1942 z) 1945
Last Answer : ANSWER: Y -- 1942
Description : What substance was used as a moderator for the chain reaction in the first nuclear reactor? w) graphite x) boron y) water z) cadmium
Last Answer : ANSWER: W -- GRAPHITE
Description : Explain the nuclear chain reaction in a nuclear power plant.
Last Answer : Nuclear chain reaction in a nuclear power plant: If a slow moving neutron hits unstable heavy nucleus of nuclear fuel U235 or Pu239 , the neutron is absorbed, the nucleus splits into two more ... chain reaction can be controlled and desired heat energy can be obtained in nuclear power plant.
Description : Which material is used in controlling chain reaction in a nuclear reactor? A) Thorium B) Uranium C) Boron D)Beryllium
Last Answer : Which material is used in controlling chain reaction in a nuclear reactor? A) Thorium B) Uranium C) Boron D)Beryllium
Description : All of the following statements about nonsense codons are true except (A) They do not code for amino acids (B) They act as chain termination signals (C) They are identical in nuclear and mitochondrial DNA (D) They have no complementary anticodons
Last Answer : Answer : C
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 : Name the particle that is most essential to continue the chain reaction during the fission of uranium - (1) Electron (2) Proton (3) Neutron (4) Positron
Last Answer : (3) Neutron Explanation: Nuclear fission is either a nuclear reaction or a radioactive decay process in which the nucleus of an atom splits into smaller parts (lighter nuclei), often producing ... in the modern world is usually a deliberately produced manmade nuclear reaction induced by a neutron.
Description : Write the name of reagent use for initating a free radical chain reaction.
Last Answer : Ans: Tertiary Butyle peroxaide.
Description : What purpose does FeCl3 serve in the electrophilic aromatic substitution reaction between chlorine and benzene? (a) It serves as a radical initiator to produce the chlorine radical needed to propagate the ... by reacting with the Cl2 and thereby activates it toward attack by benzene's π electrons.
Last Answer : It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.
Description : Why is the halogenation of alkanes considered a chain reaction? (a) it occurs quickly. (b) it occurs without the generation of intermediates. (c) each step generates the reactive intermediate that causes the next step to occur. (d) the reaction allows long chains of halogenated alkanes to be formed
Last Answer : each step generates the reactive intermediate that causes the next step to occur
Description : Name the particle that is most essential to continue the chain reaction during the fission of uranium- (1) Electron (2) Proton (3) Neutron (4) Positron
Last Answer : Neutron
Description : What is the difference between a chemical reaction and a nuclear reaction ?
Last Answer : : In a chemical reaction, the electrons in the perpendicular orbit outside the atom participate. This reaction does not result in the formation of new atoms or elements in the new corner but forms new molecules. On ... a nuclear reaction is very high and its value is in MeV order i.e. 10 6eV order.
Description : Hydrogen bomb is based upon the principle of ______. (1) Nuclear fission (2) Nuclear fusion (3) Controller nuclear reaction (4) None of these
Last Answer : (2) Nuclear fusion Explanation: The hydrogen bomb eventually relies upon atomic fusion (adding to the atomic nucleus) to release energy. Nuclear fusion is a nuclear reaction in which two or more atomic nuclei ... and then collide at a very high speed and join to form a new type of atomic nucleus.
Description : The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called - (1) Nuclear fusion (2) Nuclear fission (3) Nuclear reaction (4) Fast breeding
Last Answer : (2) Nuclear fission Explanation: Nuclear fission is a process used to create energy. It is when an atom splits apart into smaller atoms. The process gives off a lot of energy, and is used in nuclear weapons and nuclear reactors.