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

Hydrogen atom does not emit X-rays because _________________?

A. its energy levels are too close to each other

B. its energy levels are too far apart

C. it is too small in size

D. it has a single electron

Excited atoms return to their ground state in_______________?

A. 10-10s

B. 10-8s

C. 10-6s

D. 10-9s

In hydrogen spectrum which one of the following series lies in the ultraviolet region ?

A. Balmer series

B. Pfund series

C. Bracket series

D. Lymann series

Ratio of the weight of H-atom to that of an electron is approximately______________?

A. 18.336

B. 1836

C. 18360

D. 183.6

Michelson calculated the speed of light using the instruments______________?

A. spectrometer

B. galvanometer

C. interferometer

D. none of these

The equation θ = 1.22 λ/D was devised by_______________?

A. Newton

B. Einstein

C. Raleigh

D. Planks

A convex lens acts as a diverging lens if the_________________?

A. object is beyond C

B. if the object is with in C

C. if the object is within f

D. both B and C

Michelson devised the formula to calculate the speed of light_______________?

A. C = 4fd

B. C = 8fd

C. C = 16fd

D. C = 5/2fd

In optic fiber transmission the repeater are separated through a distance of __________ km in newer system?

A. 300km

B. 200km

C. 100km

D. 20km

The function of collimator in spectrometer is________________?

A. to produce parallel beams of light

B. to filter the light rays

C. to make them

D. no function

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