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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The period of a wave is 0.02 seconds. What is its frequency?
A longitudinal wave has a wavelength of 4 m and speed 400 m/s. The frequency of the wave 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?
A plane wave is incident on a boundary between two media. The angle of incidence is 30°. If the refractive index of the first medium is 1.5 and second is 1, what is the angle of refraction?
A tuning fork vibrates at 256 Hz. If the speed of sound is 340 m/s, the distance between consecutive compressions in the sound wave is:
A mechanical wave has the equation y = 5sin(2πx - 10πt), where x and y are in cm and t is in seconds. The wave velocity is:
A sound wave undergoes total internal reflection at an interface. This indicates:
Two speakers emit sound of wavelength 1 m with a phase difference of π radians. An observer is located 2 m from both speakers. The path difference at the observer's location is 0.5 m. The intensity at the observer's location will be:
A standing wave is formed on a string with 4 antinodes. The length of the string is 2 m. What is the wavelength?
A resonance tube experiment shows that the first resonance occurs at a length of 9 cm. The next resonance occurs at 27 cm. The end correction of the tube is approximately:
An observer moving at velocity v_o towards a stationary sound source of frequency f hears a frequency f'. The relationship is best represented by:
A wave travels through two media. In medium 1, its speed is 400 m/s and wavelength is 2 m. In medium 2, the speed is 600 m/s. The wavelength in medium 2 is:
The intensity of a sound wave is inversely proportional to which of the following?
A harmonic wave travels along a string with amplitude 2 cm and wavelength 40 cm. If the wave completes 10 oscillations in 5 seconds, what is the wave velocity?
The equation of a wave is y = 0.06 sin(100t - 8x), where x and y are in meters and t is in seconds. The wavelength is:
Two waves of equal amplitude and slightly different frequencies are superposed. The resulting pattern is called:
A sound source moves towards a stationary observer with velocity v_s. The observer hears frequency f'. The actual frequency of the source is f. The relationship is:
A string of length 1 m is fixed at both ends. The fundamental frequency is 100 Hz. What is the frequency of the third harmonic?