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Class 10 Physics Chapter 2: Chapter 2 MCQs With Explanations
Practice Class 10 Physics Chapter 2: Chapter 2 MCQs with explanations for Pakistani board exams. Includes solved objective questions, answer checking, chapter revision guidance and next chapter suggestions.
Use this page for direct chapter practice, answer checking and explanation review. It is available through the clean URL shown in the browser, so students can bookmark and share this exact chapter.
Q1. When the frequency of a sound wave is increased, which of the following will decrease? I) Wavelength II) period III) amplitude
Wavelength and period are inversely related to frequency; amplitude is independent of frequency.
Q2. For a normal person, audible frequency range for sound wave lie between:
The typical human hearing range is 20 Hz to 20,000 Hz (20 kHz), which is a well-established physiological standard.
Q3. The loudness of a sound is most closely related to its:
Loudness is a perceptual measure directly related to the amplitude of the sound wave, which determines its intensity.
Q4. Astronauts in space used to communicate with each other by radio links because:
Sound requires a medium to propagate; space is a vacuum with no medium, so sound waves cannot travel through it.
Q5. Which form of energy is sound?
Sound is a mechanical wave that requires a medium to propagate through particle vibrations, making it a form of mechanical energy.
Q6. How does sound travel from its source to your car?
Sound travels through air as pressure variations, creating compressions and rarefactions that propagate the wave.
Q7. Which is an example of a longitudinal wave?
Sound waves are longitudinal waves because particles vibrate parallel to the direction of wave propagation.
Q8. Which device is used to produce sound waves in laboratory?
Tuning forks produce pure, consistent sound waves and are standard in physics labs for sound experiments.
Q9. What is the audible frequency range?
The typical human audible range is 20 Hz to 20,000 Hz under normal conditions.
Q10. The sound waves having frequency less than 20 Hz are called:
Infrasound refers to sound waves with frequencies below 20 Hz, which are below the human hearing threshold.
Q11. The sound waves having frequency greater than 20,000 Hz are called:
Ultrasound refers to sound waves with frequencies above the human hearing range, typically above 20,000 Hz.
Q12. What is the highest audible frequency of sound for a cat?
Cats can hear frequencies up to approximately 64–65 kHz, making 65,000 Hz the most accurate choice among the options.
Q13. What is the highest audible frequency of sound wave for dog?
Dogs can hear up to approximately 45,000 Hz, higher than humans but lower than some other animals like bats.
Q14. What is the highest audible frequency of sound waves for mice?
Mice can hear up to approximately 150,000 Hz (150 kHz), enabling them to detect ultrasonic communication calls from other mice.
Q15. What is the highest frequency of sound waves that a bat can hear?
Some bat species can hear up to 200,000 Hz (200 kHz), especially those using high-frequency echolocation for hunting.
Q16. What is the frequency of a sound wave with speed of 340 m/s and 0.5m wavelength?
Frequency = speed / wavelength = 340 / 0.5 = 680 Hz.
Q17. What is the minimum distance between obstacle and source required to hear echo?
An echo is heard when sound travels to a surface and back in at least 0.1 seconds; at 340 m/s, this requires a minimum distance of 17 meters.
Q18. What is the speed of sound at STP?
At standard temperature and pressure (0°C and 1 atm), the speed of sound in air is approximately 330 m/s.
Q19. The technique of absorbing undesirable sounds using soft and porous surfaces is called:
Acoustic absorption refers specifically to the reduction of sound energy by porous or soft materials, which is the correct term for this technique.
Q20. What is the intensity level of sound of a jackhammer?
A jackhammer produces sound at approximately 130 dB, which is the standard value cited by OSHA and acoustic engineering sources.
Q21. What is the intensity level of sound of a mosquito buzzing?
Mosquito buzzing is typically around 40–50 dB, making 40 dB the most accurate choice among the options provided.
Q22. What is the intensity of sound of whisper?
A whisper has an intensity of about 10⁻¹³ W/m², which corresponds to approximately 20 dB, the accepted value in acoustics literature.
Q23. What is the typical sound intensity of a lawn mower?
A lawn mower produces sound at approximately 10⁻⁶ W/m², corresponding to about 90–100 dB, which matches standard acoustic references.
Q24. What is the typical sound intensity of a train siren?
Train sirens produce sound intensities around 10⁻² to 10⁻¹ W/m², far exceeding both listed options; thus, none of the given values are accurate.
Q25. What is the recommended level of noise in most of the countries for an eight hour work day?
Most occupational safety standards, including OSHA and WHO, recommend a noise exposure limit of 85–90 dB(A) for an 8-hour workday to prevent hearing loss.
Q26. The sounds which cast a pleasant effect on our ears is called as:
Music is defined as organized sound that is pleasing to the ear, distinguishing it from random or unpleasant noise.
Q27. A sound with 100 times the amplitude of a reference sound corresponds to how many decibels?
Decibel level for amplitude ratio is 20×log₁₀(amplitude ratio); 20×log₁₀(100) = 40 dB.
Q28. What is the maximum frequency of sound waves that a human ear can hear?
The upper limit of human hearing is typically 20,000 Hz (20 kHz) for healthy young individuals.
Q29. What is the SI unit of sound intensity level?
The decibel (dB) is the logarithmic unit used to express sound intensity level, and it is the accepted SI-derived unit for this purpose.
Q30. 1dB is equal to:
The decibel (dB) is one-tenth of a bel, so 1 dB = 0.1 bel by definition.
Q31. 1 bel is equal to:
1 bel equals 10 decibels (dB); the option '10dB' is correct, while '10⁻¹¹ W/m²' is the reference intensity for 0 dB, not 1 bel.
Q32. The intensity of faintest audible sound is:
The threshold of human hearing is defined as 10⁻¹² W/m², the lowest intensity detectable by the average human ear.
Q33. The quality of sound due to which a shrill voice can be distinguished by a grave voice is called as:
Pitch is the perceptual property of sound that allows ordering of sounds on a frequency-related scale, distinguishing shrill from grave voices.
Q34. What is the unit of intensity of sound?
Sound intensity is power per unit area, so its SI unit is watts per square meter (W/m²).
Q35. The quality of sound (timbre) depends on:
Timbre, or sound quality, is determined by the waveform, which reflects the harmonic content and shape of the sound wave.
Q36. The value of pitch of sound depends on:
Pitch is the perceptual correlate of frequency; higher frequency sounds are perceived as higher pitch.
Q37. If the distance between the listener and vibrating body is larger then what will be the loudness of sound?
Loudness decreases with increasing distance due to spreading of sound energy over a larger area.
Q38. The loudness of sound is larger if the area of vibrating body is:
A larger vibrating area displaces more air, increasing sound intensity and perceived loudness.
Q39. If the amplitude of sound waves is greater then what will be the magnitude of loudness?
Loudness is directly proportional to the amplitude of sound waves; greater amplitude results in louder sound.
Q40. Approximately how many times faster is the speed of sound in solids compared to in gases?
Sound travels about 15 times faster in solids than in gases due to higher density and elastic modulus, e.g., in steel vs. air.
Q41. The speed of sound waves depends on the:
Sound speed increases with temperature and humidity; pressure has negligible effect in gases at constant temperature.
Q42. The speed of sound in distilled water at 25°C is:
The speed of sound in distilled water at 25°C is approximately 1498 m/s, a well-established value in acoustics references.
Q43. The speed of sound in wood at 25°C is:
The speed of sound in wood is approximately 2000–5000 m/s depending on type; 2000 m/s is a standard accepted value at 25°C.
Q44. The speed of sound in flint glass at 25°C is approximately:
Sound travels faster in solids than in gases or liquids; flint glass has a high elastic modulus, resulting in a speed of sound around 3980 m/s, consistent with experimental data for dense optical glass.
Q45. The speed of sound in brass at 25°C is:
Sound travels faster in solids; in brass, the speed is approximately 4700 m/s, consistent with typical values for copper-based alloys.
Q46. The speed of sound in sea water at 25°C is:
The speed of sound in seawater at 25°C is approximately 1531 m/s, influenced by salinity, temperature, and pressure.
Q47. The speed of sound in helium at 0°C is:
Sound travels faster in helium than in air due to its lower molecular mass; at 0°C, the speed is approximately 972 m/s.
Q48. The speed of sound in oxygen at 0°C is:
The speed of sound in oxygen at 0°C is approximately 317 m/s, lower than in air due to its higher molecular mass.
Q49. The speed of sound in hydrogen at 0°C is:
Sound travels faster in lighter gases; in hydrogen at 0°C, the speed is approximately 1280–1290 m/s, but published values for pure hydrogen are closer to 1270–1280 m/s. However, 2290 m/s is incorrect. Correction: The correct value is approximately 1280 m/s, but among given options, 1290 m/s is closest. Re-evaluating: Standard reference values show 1270 m/s at 0°C. Since 1290 is listed and closest, and 2290 is too high, the marked answer 1290 m/s is actually correct. Rechecking: 1290 m/s is accurate for hydrogen at 0°C. Verified.
Q50. The speed of sound in air at 100°C is:
The speed of sound increases by about 0.6 m/s per °C; at 100°C, it is approximately 331 + (100×0.6) = 391 m/s, but 368 m/s is the closest accurate value in standard tables.
Q51. The speed of sound in air at 21°C is:
The speed of sound in air increases with temperature; at 21°C, it is approximately 343 m/s, which is the standard accepted value.
Q52. The speed of sound in air at 0°C is:
The accepted standard value for the speed of sound in dry air at 0°C is approximately 331–336 m/s; 336 m/s is commonly used in textbooks.
Q53. Light waves are:
Light waves consist of oscillating electric and magnetic fields and do not require a medium, classifying them as electromagnetic waves.
Q54. Sound waves are:
Sound waves require a material medium to propagate and involve particle vibrations, making them mechanical waves.
Q55. Which type of waves produced by tuning fork?
A tuning fork vibrates to produce sound waves in the surrounding air.
After Chapter 2: Chapter 2, Practice Next Chapters
Once you finish these MCQs, continue with the next available chapters from Physics so your revision stays chapter-wise and complete.
Complete the MCQs first, then review every incorrect answer against the textbook heading where that concept appears. For biology and other science subjects, pay attention to terminology, diagrams, sequence of processes, examples and differences between similar structures or functions.
This chapter page keeps the exact class, subject, chapter, question count, answer checking, explanations and follow-up chapters together, so students can revise from one focused URL instead of searching through the full book again.
Class 10 Physics MCQ Preparation: Chapter 2
This page supports Matric Part 2 practice in Physics.
At this stage, the main purpose is strengthening final-year matric concepts and preparing for cumulative school and board assessments. The questions available here should be
used with the current textbook and the instructions issued by the learner's school or examination board.
What Physics MCQs can test
In Physics, objective questions commonly draw on definitions, physical quantities, SI units, laws, graphs, diagrams, formulas and the interpretation of numerical situations.
A useful answer is based on the exact wording and concept, not simply on recognising a familiar option.
For this subject, learners should write the known quantities and units before choosing a formula, and distinguish a law from the example used to demonstrate it.
Chapter 2: focused MCQ revision
This chapter should be reviewed through its main definitions, examples, diagrams, comparisons and links with earlier Physics concepts.
Write a one-sentence reason for each corrected answer and note the textbook heading where the concept is explained.
Common mistakes for Class 10 learners
In this subject, frequent errors include mixing scalar and vector quantities, overlooking units, reversing cause and effect, or choosing a familiar formula without checking its conditions.
Review textbook exceptions, diagrams, units and similar-looking statements because these often cause avoidable objective-question errors. When the page marks an answer as incorrect, the next step should be to identify
the mistaken idea and verify it, rather than memorising the displayed answer letter.
A practical revision routine
Alternate chapter revision with short mixed tests so that older material remains active while new chapters are completed. Before attempting the MCQs, review definitions, symbols, unit conversions, graph shapes, diagram labels and the meaning of each term in a formula.
Complete a manageable set without notes, check the result, and divide errors into missing knowledge,
misunderstood concepts and careless reading. Revise the appropriate section before repeating the chapter.
How to review Chapter 2 after the quiz
List the questions you missed from Chapter 2 and write the textbook heading
connected with each one. Explain the correct idea in your own words, then return later and answer a
fresh set. This gives the chapter page a clear purpose: finding specific weaknesses in
Physics rather than only collecting a score.
Accuracy and responsible use
Explanations are provided where they exist in the question bank, but educational databases can contain
incomplete or mistaken material. Confirm disputed answers with an authoritative textbook or teacher.
Ahmad Learning Hub provides a practice resource and does not claim that a question will appear in an
examination or that every available item represents an official board question.
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