NUST NET PHYSICS QUESTIONS

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TOPIC: PHYSICS OF SOLIDS

QUESTION

Which of the following statements is the most appropriate about super conductor’s special conducting property?

OPTIONS

  1. Zero resistance below critical temperature
  2. Zero resistance above critical temperature
  3. Zero resistance at 0 K (Absolute zero)
  4. Zero resistance at room temperature

CORRECT ANSWER

Zero resistance below critical temperature

EXPLANATION

Super conductors have zero resistance below critical temperature. Critical temperature vary for different type of super conductors. Although super conductors have zero resistance at 0 k but need to identify most appropriate statement. So C is not a correct choice for this question.

TOPIC: ATOMIC SPECTRA  

QUESTION

Which of the following can be used to produce population inversion for the emission of laser?

OPTIONS

  1. Optical fiber
  2. Optical pumping
  3. Optical instrument
  4. Optical polarization

CORRECT ANSWER

Optical pumping

EXPLANATION

Population is the principle of laser. Optical pumping is a process in which light is used to raise electrons from a lower energy level in an atom or molecule to a higher one. It is commonly used in laser construction, to pump the active laser medium so as to achieve population inversion.

SAMPLE MATH QUESTIONS

SAMPLE CHEMISTRY QUESTIONS

TOPIC: NUCLEAR PHYSICS  

QUESTION

Which of the following basic forces is short range?

  1. Weak nuclear forces
  2. Strong nuclear forces
  3. Gravitational force

OPTIONS

  1. i only
  2. iii only
  3. i and ii only
  4. ii and iii only

CORRECT ANSWER

i and ii only

EXPLANATION

Weak nuclear forces and strong nuclear forces are both short range forces which are effective only within sub-nuclear distances. Gravitational, electromagnetic and electric force are all long range.


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