Uranium-238 is represented by 92U238. What does it represent?
The half life of radioactive radon is 3.8 days. The time at the end of which1/20th of the Radon sample will remain undecayed will be
Consider the following nuclear fuels:
What is the correct sequence of the above nuclear fuels in order of increasing half life?
A nucleus 92A235 A emits alpha and beta particles and is converted, to thenucleus 82By . The total number of alpha and beta particles emitted in thereaction is 11. Their respective numbers are:
S.l. unit for radioactivity is
Shielding in a nuclear reactor is generally done to protect against
Which one of the following statements is correct? The nuclear radiators produced in a reactor, which must be shielded, are:
Which one of the following pairs of materials is used as moderators in nuclear reactors
Moderator in nuclear reactor is Beryllium and heavy water.
Match List I with List II and select the correct answer (these pertain to nuclear reactors).
Match List I (Material) With List II (Application) and select the correct answer.
Which one of the following is correct ? A nuclear reactor is said to be critical when the neutron population in the reactor core is
Assertion (A): Pressurized water reactor (PWR) nuclear power plants use superheated steam.
Reason (R): An increase in the superheat at constant pressure increases the cycle efficiency.
Pressurized water reactor (PWR) nuclear power plants doesn’t use
Assertion (A): The thermal efficiency of a nuclear power plant using a boiling water reactor is higher than of a plant using a pressurized water reactor.
Reason (R): In a boiling water reactor, steam is directly allowed to be generated inthe reactor itself, whereas in a pressurized water reactor, steam is generated in aseparate boiler by heat exchanger device using water of the primary circuit which absorbs the fission energy.
Both A and R are individually true but R is not the correct explanation of A. Because low pressure and temperature in secondary loop results in poor thermodynamic efficiency in PWR.
Match List I with List II and select the correct answer using the codes given below the lists:
Since fast reactor is related with breeding, magnetic pump is needed for sodium cooled reactor, mainly natural uranium (with some enriched uranium) is used in pressurized water reactor, and graphite is moderator for gas cooled reactor.
Assertion (A): A breeder reactor does not require moderator.
Reason (R): The parasite absorption of neutrons is low.
Enriched uranium is required as fuel in a nuclear reactor, if light water isused as moderator and coolant, because light water has
Which one of the following statements is correct ?
The mass defect is
Which one of the following pairs is not correctly matched?
U-233 is not a fertile material.
Uranium 238 is represented as 92U238 . What does it imply?
The energy released during the fission of one atom of Uranium-235 inmillion electron volts is about
Energy released during fission of U-235 is 200 million electron volt