Waves Motion MCQs (Level 3)– 50 Higher-Order Thinking Skills (HOTS) MCQs with Answers

50 Higher-Order Thinking Skills (HOTS) MCQs (Level 3) on Waves Motion, Physics (Unit-Wise MCQs Practice):

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👉Physics MCQs Hub – Unit wise Physics MCQs Practice (Main-Page)👈

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Whether you are preparing for board examinations, chapter tests, college assessments, or competitive entrance exams (MDCAT, ECAT, NUST, PIEAS, GIKI, UET, FAST, and other engineering or medical admission tests), this comprehensive Wave Motion MCQ Collection is designed to help you master every important concept of wave motion and sound. The questions are arranged progressively—from basic concepts to advanced numerical problems and higher-order thinking—ensuring complete and systematic preparation for every type of examination.

This chapter-wise MCQ collection includes:

• 100 Basic MCQs Level-1 (1–100) – Covering the fundamental concepts of wave motion, types of waves, wave characteristics, sound waves, wave propagation, reflection, refraction, diffraction, interference, standing waves, Doppler Effect, ultrasound, and SONAR.
• 100 Advanced & Numerical MCQs (101–200) – Focusing on wave equations, speed of sound calculations, beats, harmonics, organ pipes, vibrating strings, Doppler Effect numericals, ultrasound, SONAR, echo calculations, and practical problem-solving.
• 50 Higher-Order Thinking Skills (HOTS) MCQs (201–250) – Designed to strengthen analytical reasoning, conceptual understanding, assertion–reason questions, experimental analysis, real-life applications, and multi-concept problem-solving skills.
• 50 Challenging MCQs Quiz with Answers – A carefully selected mix of conceptual, numerical, and HOTS questions designed for quick revision, self-assessment, and complete exam preparation.

This MCQ collection covers:

• Fundamentals of Wave Motion
• Mechanical and Electromagnetic Waves
• Transverse and Longitudinal Waves
• Wave Characteristics (Amplitude, Wavelength, Frequency, Time Period, Wave Speed)
• Wave Equation $(v=f\lambda)$
  
• Propagation of Sound Waves
• Speed of Sound in Solids, Liquids, and Gases
• Effect of Temperature on the Speed of Sound
• Newton's Formula and Laplace Correction
• Reflection, Refraction, and Diffraction of Waves
• Principle of Superposition
• Interference of Waves
• Constructive and Destructive Interference
• Beats and Beat Frequency
• Standing Waves
• Nodes and Antinodes
• Vibrating Strings
• Harmonics and Overtones
• Open and Closed Organ Pipes
• Doppler Effect
• Ultrasound and Piezoelectric Effect
• Medical Applications of Ultrasound
• SONAR and Echo Sounding
• Echolocation in Bats and Dolphins
• Real-Life Applications of Wave Motion

Every MCQ includes the correct answer along with a clear, concept-based explanation to strengthen understanding, improve problem-solving skills, and reinforce important physics concepts.

This question bank helps students to:

• Build a strong conceptual foundation in Wave Motion
• Master wave properties and sound propagation
• Improve numerical and analytical problem-solving skills
• Understand interference, standing waves, harmonics, and resonance
• Strengthen concepts of the Doppler Effect, ultrasound, and SONAR
• Avoid common examination mistakes
• Increase speed, accuracy, and confidence in objective-type questions
• Prepare effectively for both board examinations and competitive entrance tests

With 250 carefully selected MCQs arranged into 100 Basic, 100 Advanced & Numerical, and 50 Higher-Order Thinking (HOTS) questions, along with a Top 50 Challenging MCQs Quiz, this all-in-one Wave Motion MCQ Bank provides complete chapter preparation. It is an excellent study resource for strengthening concepts, improving exam performance, and achieving success in both board examinations and competitive physics entrance tests.

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Waves Motion MCQs (Level 3) – 50 Higher-Order Thinking Skills (HOTS) MCQs with Answers (MCQs 201–250)

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MCQs 201–225

Topics Covered:

• Multi-Concept Analysis
• Wave Motion
• Sound
• Interference
• Standing Waves
• Organ Pipes
• Doppler Effect
• Real-Life Applications

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MCQ No. 201

A sound wave enters a medium where its speed decreases by 20%, but its frequency remains unchanged. Which statement is correct?

a) Wavelength increases by 20%

b) Wavelength decreases by 20%

c) Frequency decreases by 20%

d) Time period decreases by 20%

Correct Answer: b) Wavelength decreases by 20%

Explanation: Since $v=f\lambda$ , frequency remains constant while wavelength changes in the same ratio as speed.

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MCQ No. 202

A student claims that sound waves carry matter because dust particles move near a loudspeaker. Which statement best explains this observation?

a) The claim is correct because sound transports particles.

b) Dust particles move due to local air vibrations, not because sound carries matter.

c) Sound converts matter into energy.

d) Sound waves travel by carrying air molecules from the speaker.

Correct Answer: b) Dust particles move due to local air vibrations, not because sound carries matter.

Explanation: Sound transfers energy, while the particles of the medium only oscillate about their equilibrium positions.

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MCQ No. 203

Two identical waves meet exactly out of phase. Which physical quantity becomes zero?

a) Frequency

b) Wave speed

c) Resultant displacement

d) Wavelength

Correct Answer: c) Resultant displacement

Explanation: Equal waves differing by 180° cancel each other completely through destructive interference.

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MCQ No. 204

A wave passes from air into water. Which quantity definitely remains unchanged?

a) Speed

b) Wavelength

c) Frequency

d) Amplitude

Correct Answer: c) Frequency

Explanation: Frequency depends only on the source of vibration.

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MCQ No. 205

Two tuning forks produce 5 beats per second. If one fork vibrates at 512 Hz, the second fork could have a frequency of:

a) 507 Hz only

b) 517 Hz only

c) Either 507 Hz or 517 Hz

d) 522 Hz only

Correct Answer: c) Either 507 Hz or 517 Hz

Explanation: Beat frequency equals the absolute difference between the two frequencies.

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MCQ No. 206

A stretched string is shortened while keeping the tension unchanged. The fundamental frequency will:

a) Decrease

b) Increase

c) Remain unchanged

d) Become zero

Correct Answer: b) Increase

Explanation: Since $f\propto\frac1L$, decreasing the length increases the frequency.

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MCQ No. 207

A closed organ pipe and an open organ pipe have the same length. Which one has the lower fundamental frequency?

a) Closed organ pipe

b) Open organ pipe

c) Both are equal

d) Cannot be determined

Correct Answer: a) Closed organ pipe

Explanation: For the same length,

$$f_{\text{closed}}=\frac{v}{4L},\qquad f_{\text{open}}=\frac{v}{2L}$$

Therefore, the closed pipe has half the fundamental frequency.

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MCQ No. 208

A student observes that increasing the temperature of air changes the wavelength of sound emitted by a tuning fork. Why?

a) Frequency changes with temperature.

b) Wave speed changes while frequency remains constant.

c) Amplitude increases.

d) The tuning fork vibrates faster automatically.

Correct Answer: b) Wave speed changes while frequency remains constant.

Explanation: Higher temperature increases the speed of sound. Since the source frequency remains constant, the wavelength increases.

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MCQ No. 209

Why are echoes more easily heard in a large empty hall than in a furnished room?

a) Furniture increases the speed of sound.

b) Furniture absorbs sound energy.

c) Furniture increases frequency.

d) Furniture produces interference.

Correct Answer: b) Furniture absorbs sound energy.

Explanation: Soft materials absorb sound, reducing reflected waves and echoes.

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MCQ No. 210

Which statement best distinguishes progressive waves from standing waves?

a) Both transfer energy equally.

b) Only standing waves transfer energy.

c) Progressive waves transfer energy, whereas standing waves do not transfer net energy.

d) Neither transfers energy.

Correct Answer: c) Progressive waves transfer energy, whereas standing waves do not transfer net energy.

Explanation: Standing waves store energy between nodes and antinodes without net energy transfer.

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MCQ No. 211

Two identical loudspeakers emit sound of the same frequency and phase. At a certain point, complete silence is observed. This is because:

a) Reflection occurs.

b) Refraction occurs.

c) Destructive interference occurs.

d) Resonance occurs.

Correct Answer: c) Destructive interference occurs.

Explanation: Opposite-phase waves cancel each other at that point.

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MCQ No. 212

If the tension in a stretched string is increased four times, the fundamental frequency becomes:

a) Half

b) Double

c) Four times

d) Unchanged

Correct Answer: b) Double

Explanation: Since $f\propto\sqrt{T}$, quadrupling the tension doubles the frequency.

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MCQ No. 213

Why is the speed of sound much greater in steel than in air?

a) Steel has lower density only.

b) Steel has much greater elasticity.

c) Steel has lower temperature.

d) Steel has lower pressure.

Correct Answer: b) Steel has much greater elasticity.

Explanation: High elasticity dominates the effect of density, resulting in a much higher speed of sound.

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MCQ No. 214

A train whistle appears shriller while approaching and less shrill while moving away. This phenomenon is explained by:

a) Interference

b) Beats

c) Doppler Effect

d) Resonance

Correct Answer: c) Doppler Effect

Explanation: Relative motion changes the observed frequency.

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MCQ No. 215

A bat can fly safely in complete darkness because it uses:

a) Infrared radiation

b) Ultrasonic echoes

c) Radio waves

d) X-rays

Correct Answer: b) Ultrasonic echoes

Explanation: Bats use echolocation by emitting ultrasonic waves and detecting the returning echoes.

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MCQ No. 216

A wave enters another medium where its speed doubles. Which statement is correct?

a) Frequency doubles.

b) Time period doubles.

c) Wavelength doubles.

d) Amplitude doubles.

Correct Answer: c) Wavelength doubles.

Explanation: Frequency remains constant, so wavelength changes directly with speed.

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MCQ No. 217

Why is ultrasound preferred over X-rays for monitoring a developing fetus?

a) Ultrasound travels faster.

b) Ultrasound is non-ionizing and safer.

c) Ultrasound has lower frequency.

d) Ultrasound is an electromagnetic wave.

Correct Answer: b) Ultrasound is non-ionizing and safer.

Explanation: Ultrasound does not expose the fetus to ionizing radiation.

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MCQ No. 218

A standing wave contains five loops. This indicates that the string is vibrating in the:

a) Third harmonic

b) Fourth harmonic

c) Fifth harmonic

d) Sixth harmonic

Correct Answer: c) Fifth harmonic

Explanation: The number of loops equals the harmonic number.

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MCQ No. 219

Which condition is essential for producing a stable interference pattern?

a) High amplitude

b) Coherent sources

c) High frequency

d) High wave speed

Correct Answer: b) Coherent sources

Explanation: A constant phase difference is necessary for stable interference.

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MCQ No. 220

A submarine measures the depth of the ocean using SONAR. Which physical quantity is measured directly?

a) Wave frequency

b) Echo travel time

c) Wave amplitude

d) Wavelength

Correct Answer: b) Echo travel time

Explanation: The depth is calculated from the measured time taken by the echo to return.

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MCQ No. 221

Why does Laplace's correction provide a more accurate value for the speed of sound?

a) It assumes constant pressure.

b) It assumes constant volume.

c) It assumes sound propagation is adiabatic.

d) It neglects density.

Correct Answer: c) It assumes sound propagation is adiabatic.

Explanation: Sound travels too rapidly for heat exchange, making the process adiabatic.

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MCQ No. 222

A musician tightens the strings of a guitar before a performance. The main purpose is to:

a) Decrease the pitch.

b) Increase the frequency of vibration.

c) Reduce the speed of sound in air.

d) Increase the wavelength.

Correct Answer: b) Increase the frequency of vibration.

Explanation: Increasing the tension raises the fundamental frequency, producing a higher pitch.

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MCQ No. 223

An astronaut outside a spacecraft cannot hear another astronaut speaking because:

a) Sound travels too slowly.

b) There is no material medium in space.

c) Space absorbs sound completely.

d) Sound changes into light.

Correct Answer: b) There is no material medium in space.

Explanation: Sound requires a material medium, whereas space is essentially a vacuum.

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MCQ No. 224

During destructive interference, what happens to the energy of the waves?

a) It is destroyed.

b) It is converted into mass.

c) It is redistributed to regions of constructive interference.

d) It disappears permanently.

Correct Answer: c) It is redistributed to regions of constructive interference.

Explanation: Energy is conserved. It is redistributed rather than destroyed.

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MCQ No. 225

A student says, "Increasing the amplitude of a sound wave increases its speed." Which response is correct?

a) The statement is correct.

b) Speed depends mainly on the properties of the medium, not amplitude.

c) Speed becomes double.

d) Speed becomes zero.

Correct Answer: b) Speed depends mainly on the properties of the medium, not amplitude.

Explanation: The speed of sound depends on the elasticity, density, and temperature of the medium, while amplitude mainly affects the loudness of the sound.

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MCQs 226–250

Topics Covered:

• Multi-Concept Reasoning
• Assertion–Reason Questions
• Experimental Analysis
• Doppler Effect
• Standing Waves
• Organ Pipes
• Ultrasound & SONAR
• Mixed ECAT/MDCAT/NUST/GIKI/FBISE Level Questions

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MCQ No. 226

A sound wave travels from air into water. Which combination correctly describes the changes?

a) Speed decreases, wavelength decreases, frequency changes

b) Speed increases, wavelength increases, frequency remains constant

c) Speed increases, frequency increases, wavelength remains constant

d) Speed remains constant, wavelength changes

Correct Answer: b) Speed increases, wavelength increases, frequency remains constant

Explanation: Sound travels much faster in water than in air. Since the source determines the frequency, it remains unchanged, so the wavelength increases according to $v=f\lambda$.

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MCQ No. 227

A student observes that increasing the amplitude of a sound wave makes it travel faster. The correct explanation is:

a) The student is correct.

b) Greater amplitude always increases wave speed.

c) Wave speed depends on the properties of the medium, not on amplitude.

d) Wave speed depends only on frequency.

Correct Answer: c) Wave speed depends on the properties of the medium, not on amplitude.

Explanation: Amplitude determines the energy or loudness of a wave, whereas the speed depends mainly on the elasticity and density of the medium.

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MCQ No. 228

Two coherent sound waves produce complete silence at a point. If the amplitude of one wave is increased while the other remains unchanged, the point will become:

a) Completely silent

b) Louder than before but not completely silent

c) Brighter

d) Unchanged

Correct Answer: b) Louder than before but not completely silent

Explanation: Complete destructive interference requires equal amplitudes. Unequal amplitudes produce only partial cancellation.

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MCQ No. 229

A stretched string produces a fundamental frequency of 200 Hz. If its length is halved and the tension remains unchanged, the new fundamental frequency becomes:

a) 100 Hz

b) 200 Hz

c) 400 Hz

d) 800 Hz

Correct Answer: c) 400 Hz

Explanation: The fundamental frequency is inversely proportional to the string length.

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MCQ No. 230

An open organ pipe and a closed organ pipe have the same fundamental frequency. Which one is longer?

a) Open organ pipe

b) Closed organ pipe

c) Both have the same length

d) Cannot be determined

Correct Answer: b) Closed organ pipe

Explanation: For the same fundamental frequency,

$$L_{\text{closed}}=\frac{\lambda}{4},\qquad L_{\text{open}}=\frac{\lambda}{2}$$

Thus, the closed pipe is half the length of the open pipe.

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MCQ No. 231 (Assertion–Reason)

Assertion (A): Standing waves do not transfer net energy.

Reason (R): They are formed by the superposition of two identical waves traveling in opposite directions.

a) Both A and R are true, and R correctly explains A.

b) Both A and R are true, but R is not the correct explanation.

c) A is true, but R is false.

d) A is false, but R is true.

Correct Answer: a) Both A and R are true, and R correctly explains A.

Explanation: Oppositely traveling waves continuously exchange energy, producing stationary patterns without net energy transfer.

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MCQ No. 232 (Assertion–Reason)

Assertion (A): Frequency remains constant when a wave enters another medium.

Reason (R): Frequency is determined by the vibrating source.

a) Both A and R are true, and R correctly explains A.

b) Both are true, but R is not the correct explanation.

c) A is true, but R is false.

d) A is false, but R is true.

Correct Answer: a) Both A and R are true, and R correctly explains A.

Explanation: The vibrating source fixes the frequency, while speed and wavelength adjust according to the medium.

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MCQ No. 233

Two tuning forks produce 12 beats per second. If one fork has a frequency of 480 Hz, the other may have:

a) 468 Hz or 492 Hz

b) 470 Hz or 490 Hz

c) 476 Hz or 484 Hz

d) 460 Hz only

Correct Answer: a) 468 Hz or 492 Hz

Explanation: Beat frequency equals the absolute difference between the two frequencies.

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MCQ No. 234

A wave changes from one medium to another where its speed doubles. Which quantity does not change?

a) Wavelength

b) Frequency

c) Wave speed

d) Energy

Correct Answer: b) Frequency

Explanation: Frequency depends only on the source and remains constant during transmission.

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MCQ No. 235

A student wants to increase the pitch of a guitar string. Which adjustment is most effective?

a) Increase its length

b) Decrease its tension

c) Increase its tension

d) Increase its linear density

Correct Answer: c) Increase its tension

Explanation: Increasing the tension raises the fundamental frequency and therefore the pitch.

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MCQ No. 236

An observer standing on a platform hears the pitch of a train whistle decrease suddenly as the train passes by. This happens because:

a) The whistle frequency changes.

b) The train slows down instantly.

c) The relative motion changes from approaching to receding.

d) Sound speed decreases.

Correct Answer: c) The relative motion changes from approaching to receding.

Explanation: The observed frequency changes abruptly due to the Doppler Effect.

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MCQ No. 237

Why are ultrasonic waves preferred over audible sound in SONAR?

a) They travel faster.

b) They have shorter wavelengths, giving better resolution.

c) They travel through a vacuum.

d) They require no energy.

Correct Answer: b) They have shorter wavelengths, giving better resolution.

Explanation: Shorter wavelengths allow ultrasonic waves to detect smaller underwater objects.

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MCQ No. 238

A standing wave has seven nodes, including both fixed ends. The number of loops formed is:

a) 5

b) 6

c) 7

d) 8

Correct Answer: b) 6

Explanation: The number of loops (antinodes) equals the number of intervals between adjacent nodes.

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MCQ No. 239

Which statement correctly compares beats and interference?

a) Both require waves of slightly different frequencies.

b) Beats require slightly different frequencies, while stable interference requires coherent sources of the same frequency.

c) Both require equal amplitudes only.

d) There is no difference between them.

Correct Answer: b) Beats require slightly different frequencies, while stable interference requires coherent sources of the same frequency.

Explanation: Beats arise from a varying phase difference, whereas stable interference requires a constant phase difference.

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MCQ No. 240

A submarine receives an echo 8 s after transmitting an ultrasonic pulse. If the speed of sound in seawater is 1500 m/s, the distance to the object is:

a) 3000 m

b) 4500 m

c) 6000 m

d) 12000 m

Correct Answer: c) 6000 m

Explanation:

$$d=\frac{vt}{2}=\frac{1500\times8}{2}=6000\ \text{m}$$

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MCQ No. 241

Which property of the medium mainly determines the speed of sound?

a) Colour

b) Elasticity and density

c) Shape

d) Volume

Correct Answer: b) Elasticity and density

Explanation: Greater elasticity generally increases wave speed, while greater density tends to decrease it.

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MCQ No. 242

If the absolute temperature of a gas becomes nine times greater, the speed of sound becomes:

a) Three times

b) Nine times

c) Four and a half times

d) Unchanged

Correct Answer: a) Three times

Explanation:

$$v\propto\sqrt{T}$$
$$\sqrt9=3$$

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MCQ No. 243

Why can dolphins detect small fish underwater more effectively than humans?

a) Dolphins produce electromagnetic waves.

b) Dolphins use ultrasonic echolocation.

c) Dolphins see better underwater.

d) Dolphins produce radio waves.

Correct Answer: b) Dolphins use ultrasonic echolocation.

Explanation: Dolphins emit ultrasonic pulses and analyze the reflected echoes.

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MCQ No. 244

If the wavelength of a wave becomes half while the frequency doubles, the wave speed will:

a) Become half

b) Remain unchanged

c) Double

d) Become four times

Correct Answer: b) Remain unchanged

Explanation:

$$v=f\lambda$$

Doubling the frequency while halving the wavelength leaves the speed unchanged.

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MCQ No. 245

A tuning fork is struck inside a vacuum chamber. Why can it still be seen vibrating but not heard?

a) Vibrations stop in a vacuum.

b) Light can travel through a vacuum, but sound cannot.

c) Sound becomes ultrasonic.

d) Frequency becomes zero.

Correct Answer: b) Light can travel through a vacuum, but sound cannot.

Explanation: Light is an electromagnetic wave, whereas sound requires a material medium.

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MCQ No. 246 (Assertion–Reason)

Assertion (A): Closed organ pipes produce only odd harmonics.

Reason (R): One end is closed and the other end is open.

a) Both A and R are true, and R correctly explains A.

b) Both A and R are true, but R is not the correct explanation.

c) A is true, but R is false.

d) A is false, but R is true.

Correct Answer: a) Both A and R are true, and R correctly explains A.

Explanation: The boundary conditions (node at the closed end and antinode at the open end) allow only odd harmonics.

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MCQ No. 247

Which situation demonstrates constructive interference?

a) Two equal waves meet exactly out of phase.

b) Two crests meet at the same point.

c) A crest meets a trough of equal amplitude.

d) A wave enters another medium.

Correct Answer: b) Two crests meet at the same point.

Explanation: Two crests reinforce each other, producing maximum displacement.

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MCQ No. 248

Which experiment provides the strongest evidence that sound is a mechanical wave?

a) Light passing through glass

b) A bell inside a vacuum jar becoming inaudible as air is removed

c) Reflection of light from a mirror

d) Formation of a rainbow

Correct Answer: b) A bell inside a vacuum jar becoming inaudible as air is removed.

Explanation: The experiment shows that sound cannot travel without a material medium.

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MCQ No. 249

A wave carries more energy than another wave of the same frequency because it has:

a) Greater wavelength

b) Greater amplitude

c) Lower speed

d) Shorter time period

Correct Answer: b) Greater amplitude

Explanation: The energy carried by a wave is proportional to the square of its amplitude.

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MCQ No. 250

A student correctly explains the relationship among wave speed, frequency, and wavelength by stating:

a) Increasing frequency always increases wavelength.

b) Wave speed is independent of the medium.

c) The relationship $v=f\lambda$  applies to all waves, and any change in speed due to a new medium changes the wavelength while the frequency remains constant.

d) Frequency changes whenever the wave enters another medium.

Correct Answer: c) The relationship $v=f\lambda$  applies to all waves, and any change in speed due to a new medium changes the wavelength while the frequency remains constant.

Explanation: This summarizes the fundamental wave equation and the behavior of waves at the boundary between two media.

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