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

A transmitting station emits radio waves of wavelength λ at power P. If h is Planck’s constant & c the speed of light what is the rate of emission of photons ?

A. λ

B. Speed of sound

C. Speed of light

D. h

Which one of the following has the largest energy content ?

A. 103 photons of wavelength 2 pm (γ-rays)

B. 102 photons of wavelength 1nm (x-rays)

C. 106 photons of wavelength 50?m (infrared)

D. 106 photons of wavelength 200nm (UV)

A photon is________________?

A. A unit of energy

B. A positively charged particle

C. A quantum of electromagnetic radiation

D. A unit of wavelength

Davison Germer experiment indicates__________________?

A. Interference

B. Polarization

C. Electron diffraction

D. Refraction

In Compton scattering, the change in wavelength is maxed if_______________?

A. The angle of scattering is 90°

B. The angle of scattering is 60°

C. The angle of scattering is 180°

D. The angle of scattering is 0

The name of the photon for quantum of light was proposed by________________?

A. Ampere

B. Plank

C. Thomson

D. Einstein

As the temperature of black body is raised the wavelength corresponding to maximum intensity________________?

A. shifts towards longer wavelength

B. shifts towards shorter wavelength

C. remain the same

D. shifts towards longer as well as shorter wavelengths

Einstein’s photoelectric equation is given by_______________?

A. 1/2 mvmax2=hf+Φ

B. 1/2 mvmax2-hf = Φ

C. 1/2 mvmax2=hf-Φ

D. All of above are correct

Rest mass of a photon is________________?

A. infinite

B. zero

C. very small

D. 1.67 x 10-27 kg

If a material object moves with speed of light its mass becomes ________________?

A. equal to its rest mass

B. double of its rest mass

C. infinite

D. zero

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