3717. Radioactivity of an isotope is expressed in
barn
MeV
Curie
Ergs
✅ The correct answer is option C.
3722. Plutonium
is recovered from spent fuel from thermal nuclear reactor.
has much lower melting point (640°C ) compared to thorium (1690°C).
both (a) and (b).
neither (a) nor (b).
✅ The correct answer is option C.
3727. The first underground nuclear test was conducted by India at
Jaisalmer
Pokharan
Kalpakkam
Narora
✅ The correct answer is option B.
3731. Thermal shield is used in high powered nuclear reactors to
protect the walls of the reactor from radiation damage.
absorb the fast neutrons.
slow down the secondary neutrons.
protect the fuel element from coming in contact with the coolant.
✅ The correct answer is option A.
3735. The most commonly used nuclear fuel in boiling water reactor is
enriched uranium
natural uranium
plutonium
monazite sand
✅ The correct answer is option A.
3740. Which of the following is a fuel for a fusion reactor (thermonuclear reactor) ?
Deuterium and tritium
U-233
Thorium
Heavy water
✅ The correct answer is option A.
3711. Use of molten metal as a coolant in fast breeder reactor helps in
rapid heat transfer from the core.
accelerating the reaction rate in the core.
breeding neutrons.
accelerating the neutrons.
✅ The correct answer is option A.
3713. Bhabha Atomic Research Centre (BARC) located at Trombay (near Bombay) has
five operating research reactors (namely Apsara, Cirus Zerelina, Purnima and Dhurva).
a 420 MW nuclear power plant.
a very large capacity (100 tons/yr) heavy water plant.
all (a), (b) and (c).
✅ The correct answer is option A.
3721. The specific heats of three gaseous coolants namely H2, He and CO2 in the increasing order are
CO2, He, H2
CO2, H2, He
H2, He, CO2
H2, CO2, He
✅ The correct answer is option A.
3726. A thermal nuclear reactor compared to a fast breeder reactor
uses slower neutrons for fission.
uses faster neutrons for fission.
gives higher power density.
requires less fuel to run at the same power level.
✅ The correct answer is option A.