Thermal shield is used in high powered nuclear reactors to__________________?

Related Mcqs:

1. Nuclear reactors are provided with shield to guard against the emission of mainly _____________ rays?

   A. X
   B. α and β
   C. Neutrons & gamma
   D. Infrared

2. Thermal nuclear reactors using enriched uranium as fuel contains a maximum of ____________ percent fissile material i.e. U-235?

   A. 1
   B. 2
   C. 3
   D. 7

3. Biological shield is provided in a nuclear power reactor to protect the ______________ from radiation damage?

   A. Fuel elements
   B. Operating personnels
   C. Walls of the reactor

   D. None of these

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

   A. 15
   B. 45
   C. 65
   D. 85

5. Safety rods provided in nuclear reactors to guard against accidents, in case of earthquake are made of___________________?

   A. High carbon steel
   B. Molybdenum
   C. Zircaloy
   D. Boron or cadmium

6. Which of the following nuclear reactors is the most efficient thermodynamically while operating between the same temperature and pressure limits of the reactor ?

   A. Molten sodium cooled
   B. CO2 gas cooled
   C. Pressurised water
   D. Boiling water

7. Heavy water used in the nuclear reactors to slow down the speed of neutrons is __________________?

   A. Highly purified water
   B. A compound of oxygen and deuterium
   C. Water having dissolved salts of heavy metals
   D. None of these

8. Which of the following types of nuclear reactors is most prone to radioactive hazards ?

   A. Pressurised water reactor
   B. Gas cooled reactor
   C. Molten sodium cooled reactor
   D. Boiling water reactor

9. Which is the most commonly used molten metal for cooling of nuclear reactors ?

   A. Calcium
   B. Sodium
   C. Mercury
   D. Zinc

10. Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher _____________________?

    A. Melting point, hence can be subjected to higher temperature
    B. Density; hence core volume for a given power output would be smaller
    C. Resistance to effects of irradiation
    D. All A., B. and C.