Q. The ratio of atomic radius to its nuclear radius is about

View solution

Q. The time required for half of the __________ of a radioactive isotope to decay is called its half life.

View solution

Q. Which is a fertile nuclear fuel ?

View solution

Q. Graphite is used in nuclear reactor as

View solution

Q. The ₉₂U²³⁸ emits an a-particle. The product is

View solution

Q. 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

View solution

Q. Thermal shield is used in high powered nuclear reactors to

View solution

Q. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.

View solution

Q. A fast breeder reactor employs

View solution

Q. Percentage of U-238 in natural uranium is around

View solution

Q. Emission of β-particles during radioactive decay of a substance is from

View solution

Q. How many atoms are present in one gm-atom of an element ?

View solution

Q. Uranium ore is currently mined & concentrated at

View solution

Q. Which of the following ores contains maximum percentage of uranium ?

View solution

Q. Atoms with same number of neutrons, but different number of nucleons are called

View solution

Q. Enrichment of uranium is done to increase the concentration of __________ in the natural uranium.

View solution

Q. Thorium metal

View solution

Q. Fast breeder nuclear reactors using enriched uranium as fuel may contain upto a maximum of __________ percent of U-235 (i.e. fissile material).

View solution

Q. A fertile material is the one, which can be

View solution

Q. The number of neutrons accompanying the formation of ₅₄Xe¹³⁹ and ₃₈Sr⁹⁴ from the absorption of a slow neutron by ₉₂U²³⁵ , followed by nuclear fission is

View solution