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 an electron microscope, we use energetic particles because of______________?

A. Penetrating power is high

B. Kinetic energy is large

C. Wavelength is very short

D. All the above reasons

If a diffraction grating is placed in the path of a light beam it reveals______________?

A. Wave property

B. Particle property

C. Energy particle

D. Electromagnetic wave property

In Davisson-Germer experiment the diffracted proton from crystal shows______________?

A. Particle property

B. Wave property

C. Light property

D. Quantum property

The velocity of a particle of mass m of de-Broglie wavelength λ is______________?

A. v = 3 ×× 106 ms-1

B. v = 2 ×× 10 ms-1

C. v = 2 ×× 6 ms-1

D. v = 2 ×× 106 ms-1

A photon of wavelength 900nm behaves like a particle of mass______________?

A. 5.53 x 10-36kg

B. 0 kg.

C. 2.46 x 10-36kg

D. 1.84 x 10-44kg

If n number of the photon is striking on a metal surface then total momentum exerted is_______________?

A. p

B. n

C. 0

D. None

If a photon is reflected from the mirror then the change in momentum of each photon is_______________?

A. Zero

B. Double

C. Half

D. 1

If the wavelength of incident radiation is increased in photoemission then_________________?

A. The maximum kinetic energy of the photoelectrons increases

B. The minimum kinetic energy of the photoelectrons decreases

C. The minimum kinetic energy of the photoelectrons increases

D. The average kinetic energy of the photoelectrons decreases

In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted

A. Becomes double

B. Remains same

C. Becomes half

D. First increases then decrease because of the curvilinear graph

After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________?

A. Increases because wavelength decreases

B. Decreases because speed decreases

C. Remains same

D. Increases then decrease

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