Physics - Waves and Sound
Practise 24 WBJEE previous year questions on Waves and Sound, compiled from papers spanning 2010 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.
Waves and Sound has been asked in 12 of the 18 years of WBJEE papers analysed (2009–2026), with 24 questions in all. 50% of them were easy, 42% moderate and 8% tough. Most of its questions came from 2017, with 3 questions that year. In the last three years (2024–2026) it had 3 questions across 3 papers, about 1 per paper.
The chapter's 8 topics are not weighted equally: Organ Pipe (Vibration of Air Column) (5 questions, 21%), Basics of Mechanical Waves (4 questions, 17%), and Doppler’s Effect (4 questions, 17%) have been asked the most. Over the last five years the most frequent topics have been Basics of Mechanical Waves (2) and Stationary waves (2). Organ Pipe (Vibration of Air Column) has produced the most tough questions (1).
- 1The equation of a transverse wave is . If the maximum particle velocity be four times that of wave velocity then2026Basics of Mechanical Waves
- 2The equation of stationary wave along a stretched string is given by . Here x and y are in cm and t in second. The separation between two ad2025Stationary waves
- 3A wave disturbance in a medium is described by where are in meters and is in second. Which statement(s) is/are correct?2025Stationary waves
- 4The displacement of a plane progressive wave in a medium, travelling towards positive \(x\)-axis with velocity \(4 {~m} / {s}\) at \(t=0\) i2023Basics of Mechanical Waves
- 5The intensity of light emerging from one of the slits in a Young's double slit experiment is found to be limes the intensity of light emergi2020Interference and Superposition of Waves
- 6A uniform string of length and mass is fixed at both ends while it is subject to a tension . It can vibrate at frequencies given by the form2017Vibration of String
- 7Two monochromatic coherent light beams and have intensities and respectively. If these beams are superposed, the maximum and minimum intensi2017Interference and Superposition of Waves
- 8If the pressure, temperature and density of an ideal gas are denoted by and , respectively, the velocity of sound in the gas is2017Speed of Sound Waves
- 9The velocity of sound in air at and 1 atm pressure is . At and pressure, the velocity of sound in air is approximately2016Speed of Sound Waves
- 10For air at room temperature, the atmospheric pressure is and density of ait is . For a tube of length , closed at one end, the lowest freque2016Organ Pipe (Vibration of Air Column)
- 11train is moving with a uniform speed and an observer is approaching the train with the same speed. If the train blows a whistle of frequency2015Doppler's Effect
- 12The length of an open organ pipe is twice the length of another closed organ pipe. The fundamental frequency of the open pipe . The frequenc2015Organ Pipe (Vibration of Air Column)
- 13whistle whose air column is open at both ends has a fundamental frequency of . If the speed of sound in air is , the length of the whistle, 2014Organ Pipe (Vibration of Air Column)
- 14A car is moving with a speed of towards a roadside source that emits sound at a frequency of . The car driver listens to the sound while app2014Doppler's Effect
- 15Sound waves are passing through two routes-one in atraight path and the other along a semicireular path of radius and are again combined int2014Interference and Superposition of Waves
- 16A travelling acoustic wave frequency is moving along the positive -direction with a velocity of . The phase difference between two points an2013Travelling Waves
- 17The fundamental frequency of a closed pipe is equal to the frequency of the second harmonic of an open pipe. The ratio of their lengths is2013Organ Pipe (Vibration of Air Column)
- 18A car moving at a velocity of towards an approaching bus that blows a horn at a frequency of on a straight track. The frequency of this horn2013Doppler's Effect
- 19A train approaching a railway platform with a speed of starts blowing the whistle. Speed of sound in air is . If the frequency of the emitte2012Doppler's Effect
- 20The frequency of the first overtone of a closed pipe of length is equal to that of the first. overtone of an open pipe of length . The ratio2012Organ Pipe (Vibration of Air Column)
- 21A progressive wave moving along -axis is represented by The wavelength at which the maximum particle velocity is 3 times the wave velocity i2012Travelling Waves
- 22A plane progressive wave is given by \(y=2 6.284(330 {t}- {x})\). What is period of the wave?2011Travelling Waves
- 23The equation of a progressive wave is where is in meter and is in second. The velocity of the wave is2010Basics of Mechanical Waves
- 24A longitudinal wave is represented by . The maximum particle velocity will be four times the wave velocity if:2010Basics of Mechanical Waves
Frequently Asked Questions
1.How many questions are available for Waves and Sound?
This chapter includes 24 questions compiled from WBJEE papers spanning 2010 to 2026.
2.Are these questions only from WBJEE, or from other exams too?
These are WBJEE questions specifically for the Waves and Sound chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.
3.Is Waves and Sound an important chapter for WBJEE Physics?
Waves and Sound has appeared in 12 of the 18 years of WBJEE papers covered here, with 24 questions across 12 papers - about 2 per paper it appears in.
4.What is the difficulty level of Waves and Sound questions in WBJEE?
Of the 24 questions analysed for this chapter, 50% are easy, 42% moderate and 8% tough. 2017 had the most, with 3 questions.
5.Which topics in Waves and Sound should I focus on?
These topics have carried the most weightage in Waves and Sound:
- Organ Pipe (Vibration of Air Column) - 5 questions (21%)
- Basics of Mechanical Waves - 4 questions (17%)
- Doppler’s Effect - 4 questions (17%)
- Organ Pipe (Vibration of Air Column) has produced the most tough questions (1).
6.Is Waves and Sound's weightage in WBJEE going up or down?
Across all 12 papers analysed, Waves and Sound has averaged about 2.0 questions per paper. In the last three years (2024–2026), that average has fallen, at about 1.0 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.