Materials And Components - Study Mode
[#166] Materials which lack permanent magnetic dipoles are known as
Correct Answer
(B) Diamagnetic
[#167] A 'hole' in a semiconductor has 1. Positive charge equal to the electron charge 2. Positive mass equal to the mass of the electron 3. An 'effective mass' greater than the effective mass of electron 4. Negative mass and positive charge equal to the charge in nucleus
Correct Answer
(B) 1 and 3 only
[#168] The magnetic field at which a superconductor remains in its superconducting state at a temperature less than the transition temperature is
Correct Answer
(C) Less than the critical field corresponding to the given temperature
[#169] In a superconductor the value of critical density depends upon
Correct Answer
(D) Both A and B
[#170] In scintillation coating applications, shields of which material are generally placed around the photomultiplier tube to overcome interference effects of electrons deflected from their normal path?
Correct Answer
(B) Mu-metal magnetic