Physics MCQs: Most Important Questions for Exams

McqsTestz.com has uploaded a comprehensive collection of Physics MCQs covering a wide range of topics including mechanics, thermodynamics, electromagnetism, optics, modern physics, waves, fluids, and more. Perfect for students preparing for exams such as matriculation, intermediate, competitive tests, Lecturer and university-level assessments.

Physics MCQs

In bringing an electron towards the second electron, the electrostatic potential energy of the system

A. Decreases

B. increases

C. remains the same

D. becomes zero

How many electrons per second constitute a current of one micro ampere?

A. one electron

B. 10 –6 electrons

C. 106 electrons

D. 6.25 × 1012 electrons

A piece of copper and a piece of germanium are cooled from the room temperature down to 77 K.

A. The resistance of each of them increases.

B. The resistance of each of them decreases.

C. The resistance of copper decreases and that of germanium increases.

D. The resistance of copper increases and that of germanium decreases

Two parallel beams of positrons moving in the same direction will________?

A. repel each other

B. not interact with each other

C. attract each other

D. be deflected normal to the plane containing the two beams.

An emf of 5 volt is produced by a self inductance, when the current changes at a steady rate from 3 to 2 ampere in 1 millisecond. The value of self inductance is_______?

A. zero

B. 5 H

C. 5000 H

D. 5 mH

The core of a transformer is laminated to reduce energy losses due to__________?

A. Eddy currents

B. Hysteresis

C. Resistance in winding

D. None of these

Which of the following is true ?

A. Lyman series is a continuous spectrum.

B. Paschen series is a line spectrum in the infra red.

C. Balmer series is a line spectrum in the ultraviolet.

D. the spectral series formula can be derived from the Rutherford model of the hydrogen atom.

Electric current in a solid metal conductor is caused by the movement of what ?

A. Protons

B. Electrons

C. Metal atoms

D. Metal ions

The centripetal acceleration produced in a rotating body is commonly due to change on_________of body?

A. magnitude

B. direction

C. both

D. None of these

The mass-energy relation is the outcome of____________?

A. Quantum theory

B. General theory of relativity

C. Special theory of relativity

D. None of these

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