22901. The main purpose of control rod in a nuclear reactor is to control the
22902. Nuclear power reactor located at Tarapur is of __________ type.
22903. Which of the following is not an ore of uranium ?
22904. Which one is different for the neutral atoms of the isotopes of an element ?
22905. Which of the following gases has very high neutron capture cross-section, making it unsuitable as a coolant in nuclear reactor?
22906. The number of neutrons in the nucleus of Uranium-233 (92U233) is
22907. The starting winding is opened by a centrifugal switch when the motor has come up to about
22908. Outer cage of squirrel cage motor is made up of
22909. The disintegration rate of a radioactive element
22910. In star connection the supply voltage is reduced as
22911. Which of the following is the most harmful for the human being ?
22912. Heavy water is preferred over ordinary water as a coolant, because it.
22913. An element having large number of __________ is most easily subjected to nuclear fission.
22914. Coolant used in a fast breeder reactor is
22915. Molten sodium is used as a coolant in a fast breeder reactor, because of its
22916. Neutrons have mass approximately equal to that of __________ atoms.
22917. Pressure of CO2 gas (which is a coolant) in the Calder-Hall nuclear reactor is __________ kgf/cm2 .
22918. The electric power generation cost in nuclear power plant is less than that in a coal based thermal power plant, mainly because the
22919. Heavy water used in the nuclear reactors to slow down the speed of neutrons is
22920. Thermal neutrons which are used to cause the fission of U-235 have energy __________ eV.
22921. Which of the following types of nuclear reactors is most prone to radioactive hazards ?
22922. Thermal nuclear reactors using enriched uranium as fuel contains a maximum of __________ percent fissile material i.e. U-235.
22923. The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element ?
22924. Which of the following is not used as a nuclear fuel cladding material ?
22925. The function of moderators in nuclear reactor is to
22926. Specific gravity of uranium and plutonium is about
22927. In the three-point starter the hold ON coil is connected in the
22928. 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.
22929. __________ nuclear reactor does not require a heat exchanger to supply steam to power turbine.
22930. Radioactive decay is a __________ change.
22931. A moderator __________ the neutrons.
22932. Thorium can be converted into U-233 in a __________ reactor.
22933. Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher
22934. Nuclear fuel complex, Hyderabad is engaged in the job of
22935. Which is a fertile nuclear fuel ?
22936. The time required for half of the __________ of a radioactive isotope to decay is called its half life.
22937. The ratio of atomic radius to its nuclear radius is about
22938. To magnetize steel is difficult because of its
22939. __________ moderator is used in a fast breeder reactor.
22940. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.
22941. Thermal shield is used in high powered nuclear reactors to
22942. The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then
22943. The 92U238 emits an a-particle. The product is
22944. Graphite is used in nuclear reactor as
22945. The half life period of a radioactive element depends on its
22946. __________ have the same mass number, but different nuclear charge.
22947. Which one is radioactive in nature ?
22948. Absorption/scattering cross-section of an element is expressed in "barn", which is equivalent to
22949. The most commonly used nuclear fuel in boiling water reactor is
22950. Nuclides having the same atomic numbers are termed as