(1) In nondestructive testing, a discontinuity may be defined as an interruption in the normal physical structure or configuration of a part.(2) A discontinuity may or may not affect the usefullness of a part. Which statement(s) are true?

BOTH ARE TRUE

Explanation: Nondestructive testing or Evaluation is a term used in the field of science and technology to describe the evaluations, analysis or testing carried out on components of materials without destroying any part or components of the test materials. It is very useful in scientific research or industrial engineering environments. When any disruption of physical structure or configuration of a component will lead to discontinuing of the test, and it may not affect the usefulness of the affected parts.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

grav forces affect all objects magnetic forces affect magnetic objects and electric currents