Nuclear Power Stations MCQs

Which isotope of uranium has the capacity to sustain the chain reaction?

• uranium-245

• uranium-235

• uranium-230

• uranium-225

In a fission process, the largest fraction of the energy released is as

• kinetic energy of the neutrons

• kinetic energy of the fission products

• instantaneous release of gamma rays

• gradual radioactive decay of fission products

The moderator in nuclear plants is used to

• reduce temperature

• extract heat from nuclear reaction

• control the reaction

• cause collision with the fast moving neutrons to reduce their speed

• moderate the radioactive pollution

The most commonly used moderator in nuclear plants is

• graphite

• heavy water

• lead

• concrete

• deuterium

The element with the lowest mass per nucleon is

• hydrogen

• helium

• iron

• uranium

Which of the following is the most essential requirement of control rod material?

• It must be lightweight

• It must be cheap

• It must be very reflective to neutrons

• It must have high absorption capacity for neutrons

The function of control rods in nuclear plants is to

• control temperature

• control radioactive pollution

• control absorption of neutron

• control fuel consumption

• none of the above

Which of the materials below are commonly used for shielding?

• lead and concrete

• heavy water

• graphite or cadmium

• thick galvanized sheets

• black carbon papers

A reactor becomes critical when the production of neutrons is

• exponentially growing

• so low it is negligible

• balanced by the neutron leakage

• first initiated

• totally stopped

In the equations below, m_H is the atomic mass of hydrogen, m_n is the mass of a neutron, and M is the atomic mass of the atom. Which of the following could be used to calculate the mass defect?

• Δm = Z·m_H + N·m_n − M

• Δm = Z·m_H + N·m_n + M

• Δm = Z·m_H − Z·m_n − M

• Δm = Z·m_H − N·m_n + M

• Δm = M − N·m_H − Z·m_n