PPSC Lecturer of Physics Online Test 29 Past Papers

Which of the following chemical elements is not produced by thermonuclear fusion in stars?

Fission fragments usually decay by emitting:

Nuclear fusion in stars produces all the chemical elements with mass numbers less than:

For a controlled nuclear fusion reaction, one needs:

In a nuclear reactor the fissionable fuel is formed into pellets rather than finely ground and the pellets are mixed with the moderator. This reduces the probability of:

Consider all possible fission events. Which of the following statements is true?

In a nuclear power plant, the power discharged to the environment:

Nuclear fusion in the Sun is increasing its supply of:

To produce energy by fusion of two nuclei, the nuclei must:

The binding energy per nucleon:

In a neutron-induced fission process, delayed neutrons come from:

Which one of the following is NOT needed in a nuclear fission reactor?

The energy released in a complete proton-proton cycle is about:

A nuclear reactor is operating at a certain power level, with its multiplication factor adjusted to unity. The control rods are now used to reduce the power output to one-half its former value. After the reduction in power the multiplication factor is maintained at:

Separation of the isotopes of uranium requires a physical, rather than chemical, method because:

The purpose of a moderator in a nuclear reactor is to:

High temperatures are required in thermonuclear fusion so that:

The barrier to fission comes about because the fragments:

In the uranium disintegration series:

In a subcritical nuclear reactor:

For purposes of a practical (energy producing) reaction one wants a disintegration energy Q that is:

The function of the control rods in a nuclear reactor is to:

In the normal operation of a nuclear reactor:

The barrier to fusion comes about because protons:

Most of the energy produced by the Sun is due to: