JEE Physics - MCQ Practice Questions
Physics is where JEE ranks are usually won or lost, since a single conceptual slip changes the whole answer. Questions here span mechanics, rotational motion, thermodynamics, waves and oscillations, electrostatics, current electricity, magnetism, optics, and modern physics. Numerical problems carry full derivations so you can see which step you skipped, not just which option was right.
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A sound wave with frequency 500 Hz travels through air (speed = 330 m/s) and then enters water (speed = 1500 m/s). What happens to the wavelength?
A stationary observer hears a sound from an approaching source. The observed frequency is:
When two coherent light sources interfere, the condition for destructive interference is:
A wave equation is given as y = 5sin(2πx/4 - 2πt/2). The amplitude and frequency are:
The intensity of a sound wave is I. If the amplitude is doubled and frequency is halved, the new intensity will be:
A pipe closed at one end and open at the other has a length of 0.5 m. The fundamental frequency is (speed of sound = 340 m/s):
Two sources of sound have intensities I₁ and I₂. The ratio of their amplitudes is:
When a wave reflects from a denser medium, the phase change is:
In Young's double slit experiment, if the distance between slits is d, distance to screen is D, and wavelength is λ, the fringe width is:
For a stationary wave on a string fixed at both ends of length L = 1 m, the fundamental frequency is 100 Hz. What is the velocity of the transverse wave on the string?
A source of frequency 500 Hz moves towards a stationary observer at 10 m/s. The speed of sound is 330 m/s. What is the apparent frequency heard by the observer?
A string of length 2 m vibrates in its third harmonic. The number of nodes (excluding ends) is:
A pipe open at both ends resonates at a frequency of 500 Hz for the fundamental mode. If it is closed at one end, the fundamental frequency becomes:
Two identical sound sources emit waves in phase. An observer is at a point where the path difference is 1.5λ. What is the phase difference?
A stationary observer hears a frequency of 1100 Hz from a moving source. If the source is moving towards the observer with speed 10 m/s, and the actual frequency is 1000 Hz, what is the speed of sound?
When a wave passes from a less dense to a more dense medium, the phenomenon that does NOT occur is:
A transverse wave on a string has amplitude A = 0.1 m and frequency f = 50 Hz. Maximum particle velocity is:
A sound source moves towards a stationary observer with velocity 30 m/s. The actual frequency of the source is 500 Hz and speed of sound is 330 m/s. The apparent frequency observed is:
A pipe closed at one end has a length of 50 cm. The fundamental frequency of the pipe is 170 Hz. What is the speed of sound in the pipe?
A wire of length 1 m and mass 10 g is fixed at both ends and has a tension of 90 N. What is the fundamental frequency of the wire?