{ "title": "Physics Booster: Sound & Wave Motion PYQ Practice Set (7 Questions)", "category": "Mock Test", "duration": 7, "schema": { "@context": "https://schema.org", "@type": "Exam", "name": "Physics Booster: Sound & Wave Motion PYQ Practice Set", "description": "7 quick, high-yield Previous Year Question (PYQ) boosters covering wave formulas, medium attributes, and longitudinal wave characteristics.", "educationalLevel": "Competitive Exam", "learningResourceType": "Mock Test", "assessmentType": "Multiple Choice Questions", "numberOfQuestions": 7, "timeRequired": "PT7M", "subject": "Physics - Sound & Wave Motion PYQs" }, "questions": [ { "text": "A sound wave travels from an iron rod into the open air. If its frequency remains unchanged during this media transition, what happens to its wavelength?", "options": [ "It increases significantly", "It decreases significantly", "It remains perfectly identical", "It instantly drops to zero" ], "ans": 1, "topic": "Wave Media Transitions", "explanation": "Sound travels much faster in solids than in gases (v_iron > v_air). Since v = f × λ and frequency (f) is fixed by the source, a drop in speed when entering the air requires a proportional decrease in wavelength." }, { "text": "In a longitudinal wave propagation pattern, what is the phase difference between a compression and its immediate next adjacent rarefaction?", "options": [ "0° (0 radians)", "90° (π/2 radians)", "180° (π radians)", "360° (2π radians)" ], "ans": 2, "topic": "Wave Anatomy", "explanation": "A compression represents a maximum density peak, while a rarefaction represents a minimum density trough. Because they are completely opposite phases in a wave cycle, the phase separation is exactly half a cycle, which equals 180° or π radians." }, { "text": "When a tuning fork is struck harder to emit a louder sound, how does this mechanical adjustment impact the speed of the sound wave in the room?", "options": [ "The speed of the sound wave increases", "The speed of the sound wave decreases", "The speed of the sound wave remains unchanged", "The speed fluctuates back and forth with the vibrations" ], "ans": 2, "topic": "Tuning Fork Dynamics", "explanation": "Striking the fork harder increases its amplitude and loudness, but has no effect on the medium. The speed of sound depends strictly on properties of the medium (like temperature and air composition), meaning loud and soft sounds travel at the same speed." }, { "text": "An echo sounder on a marine ship sends an ultrasonic pulse straight down into the ocean. The signal reflects off the seabed and returns in 4.0 seconds. If the speed of sound in saltwater is 1500 m/s, what is the depth of the seabed?", "options": [ "6000 m", "3000 m", "1500 m", "750 m" ], "ans": 1, "topic": "Echo Calculations", "explanation": "For echo tracking, the total distance traveled by the pulse is two-way (2d = v × t). Therefore, the depth calculation is: d = (v × t) / 2 = (1500 × 4.0) / 2 = 6000 / 2 = 3000 meters." }, { "text": "Which of the following physical variables alternates between local maximum and minimum values to define a rarefaction zone in an acoustic wave?", "options": [ "Source dimensions", "Wave propagation direction", "Medium density and pressure", "The absolute temperature of the source" ], "ans": 2, "topic": "Rarefaction Properties", "explanation": "A longitudinal sound wave is a pressure disturbance. A compression is a point of maximum density and pressure, whereas a rarefaction is a localized region of minimum density and pressure." }, { "text": "A periodic wave source produces 40 compressions and 40 rarefactions in exactly 2.0 seconds. What is the operating frequency of this wave engine?", "options": [ "80 Hz", "40 Hz", "20 Hz", "10 Hz" ], "ans": 2, "topic": "Wave Calculations", "explanation": "One complete wave cycle consists of one compression and one rarefaction combined. If 40 pairs clear the marker in 2.0 seconds, the total cycles completed equals 40. Frequency is cycles per second: f = 40 / 2.0 = 20 Hz." }, { "text": "If a technician passes an acoustic sound wave into a closed chamber and doubles its frequency while keeping the internal air parameters identical, the wavelength will:", "options": [ "Double", "Be reduced to one-half", "Quadruple", "Remain completely unaffected" ], "ans": 1, "topic": "Wave Equation Dynamics", "explanation": "Because the air conditions inside the chamber remain unchanged, the propagation speed (v) is constant. According to v = f × λ, doubling the frequency forces the wavelength to scale down to exactly one-half to maintain a balanced equation." } ] }

This is a quick 7-question Previous Year Question (PYQ) booster set targeting core exam patterns for Sound & Wave Motion. Copy and paste this code into your Blogger HTML view to expand your high-performance exam database.

Physics Booster: Sound & Wave Motion PYQ Practice Set (7 Questions)