540. Solid fuel for nuclear reactions may be fabricated into various small shapes such as
A.Plates
B.Pallets
C.Pins
D.Any one of the above

---

541. Which of the following is more appropriate for a moderator. One which
A.Does not absorb neutrons
B.Absorbs neutrons
C.Accelerates neutrons
D.Eats up neutrons

---

542. A fission chain reaction in uranium can be developed by
A.Slowing down fast neutrons so that U235 fission continues by slow motion neutrons
B.Accelerating fast neutrons
C.Absorbing all neutrons
D.Using moderator

---

543. In triggering fission, the following types of neutrons are desirable
A.Fast moving
B.Slow moving
C.Critical neutrons
D.Neutrons at rest

---

544. Effective moderators are those materials which contain
A.Light weight atoms
B.Heavy weight atoms
C.Critical atoms
D.Zero weight atoms

---

545. In a fission process, maximum %age of energy is released as
A.Kinetic energy of neutrons
B.Kinetic energy of fission products
C.Instantaneous release of gamma rays
D.Gradual readioactive decay of fission products

---

546. The following present serious difficulty in designing reactor shield
A.Alpha particles
B.Beta particles
C.Thermal neutrons
D.Fast neutrons and gamma rays

---