JEE Physics - MCQ Practice Questions

A guitar string of length 0.6 m is vibrating in its third harmonic. How many antinodes are present on the string?

The amplitude of a wave is doubled. How does this affect the intensity of the wave?

An observer approaches a stationary sound source of frequency 500 Hz with velocity 20 m/s. If the speed of sound is 340 m/s, what is the observed frequency?

Two coherent sources vibrate in phase and produce waves of wavelength 2 cm. If they are separated by 6 cm, what is the phase difference between the waves at a point equidistant from both sources?

A sound source is moving away from a stationary observer with velocity 30 m/s. The source frequency is 600 Hz and speed of sound is 340 m/s. What is the observed frequency?

A stretched string fixed at both ends has length 1 m and mass 0.01 kg. If tension is 40 N, what is the fundamental frequency?

Two waves of same frequency interfere constructively. If individual amplitudes are 3 cm and 4 cm, what is the resultant amplitude?

A plane wave is incident on a barrier with a small opening. The wave diffracts through the opening. Which factor most affects the diffraction pattern?

A wave equation is given as y = 0.5sin(2πx/4 - 2πt/0.5) meters. What is the wave velocity?

A string is vibrating in its second harmonic with frequency 200 Hz. What is the fundamental frequency?

Two sources produce sound waves of frequencies 250 Hz and 254 Hz. What is the beat frequency heard?

A light wave travels from a denser medium (refractive index 1.5) to a rarer medium (refractive index 1.0). If the angle of incidence is 30°, what is the angle of refraction?

A standing wave is formed on a string with equation y = 2cos(πx)sin(100πt) cm. What is the wavelength?

An organ pipe closed at one end has fundamental frequency 200 Hz. What is the frequency of the next possible resonance?

A progressive wave has amplitude 5 cm and wavelength 20 cm. Two points on the wave separated by 10 cm have a phase difference of:

A source emits sound with intensity 10⁻⁸ W/m² at a distance of 1 m. Assuming spherical spreading, what is the intensity at 10 m distance?

A wave undergoes constructive interference with another identical wave. The resulting amplitude is A₀. If one wave's amplitude is reduced to half, what is the new resultant amplitude for constructive interference?

A wave traveling in the positive x-direction reflects from a fixed end. What is the phase change upon reflection?

A transverse wave travels along a stretched string with equation y = 0.02sin(50πt - 4πx), where x and y are in meters and t is in seconds. What is the wave velocity and wavelength of this wave?

A tuning fork of frequency 512 Hz is held above the open end of a resonance tube containing water. The tube is gradually filled with water and resonance is first observed when the water level is 16.2 cm below the open end. Taking speed of sound as 340 m/s, what is the effective length of the air column at first resonance and why?