PPSC Lecturer of Physics Online Test 30 Past Papers

A nucleus with a mass number of 64 has a mean radius of about:

The half-life of a radioactive substance is:

Tokamaks confine deuteron plasmas using:

Bromine, with atomic mass 79.942 u, is composed of nearly equal amounts of two isotopes, one of which contains 79 nucleons per atom. The mass number of the other isotope is:

Compared to fusion in a tokamak, laser fusion makes use of:

The smallest particle of any chemical element that can exist by itself and yet retain the qualities that distinguish it as that element is:

Most magnetic confinement projects attempt:

Iron has atomic number 26. Naturally mined iron contains isotopes of mass numbers 54, 56, 57, and 58. Which of the following statements is FALSE?

The mass of an electron:

The binding energy of a nucleus is the energy that must be supplied to:

Two protons are separated by 10−16 m. The nuclear (N), electrostatic (E), and gravitational (G) forces between these protons, in order of increasing strength, are:

Of the following, which has the smallest rest energy?

Two protons are about 10⁻¹⁰ m apart. Their relative motion is chiefly determined by:

Lawson’s number is 10²⁰ s ·m−³. If the density of deuteron nuclei is 2 × 10²¹ m⁻³ what should the confinement time be to achieve sustained fusion?

The greatest binding energy per nucleon occurs for nuclides with masses near that of:

The atomic number of an element is:

Stable nuclei generally:

Let Z denote the atomic number and A denote the mass number of a nucleus. The number of neutrons in this nucleus is:

The isotopes of an element:

In laser fusion, the laser light is:

A proton in a large nucleus:

The mass of an electron:

Volumes of atomic nuclei are proportional to:

Which of the following particles is stable?

Most laser fusion projects attempt: