Pakprep.com is one and only online portal in Pakistan which provides quality material to prepare for any medical and engineering university of Pakistan. We have more than 15000 solved MCQ’s with explanation, which are separated according to subject and chapters. To start your preparation today CLICK HERE. Here are some sample Physics MCQ’s from Pakrep.com,
TOPIC: PHYSICS OF SOLIDS
Which of the following statements is the most appropriate about super conductor’s special conducting property?
- Zero resistance below critical temperature
- Zero resistance above critical temperature
- Zero resistance at 0 K (Absolute zero)
- Zero resistance at room temperature
Zero resistance below critical temperature
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
Which of the following can be used to produce population inversion for the emission of laser?
- Optical fiber
- Optical pumping
- Optical instrument
- Optical polarization
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.
TOPIC: NUCLEAR PHYSICS
Which of the following basic forces is short range?
- Weak nuclear forces
- Strong nuclear forces
- Gravitational force
- i only
- iii only
- i and ii only
- ii and iii only
i and ii only
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.