1. Sound waves are
Answer: C. longitudinal waves
Physics Class 10 Unit 13: Sound MCQs
59 multiple choice questions with the correct answer for each. Tap an option to check yourself, or switch on "Show all answers". This is page 1 of 2.
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2. Sound waves cannot travel through
Answer: A. vacuum
3. The speed of sound at 0 °C deduced by the French Academy was about
Answer: B. 332 m/s
4. In a compression, the pressure is
Answer: D. high
5. In a rarefaction, the pressure is
Answer: C. low
6. The amplitude of a sound wave tells about the
Answer: D. energy carried by the wave
7. The human audible range of frequencies is
Answer: B. 20 Hz to 20,000 Hz
8. Sound waves with frequency less than 20 Hz are called
Answer: A. infrasonic waves
9. Sound waves with frequency greater than 20,000 Hz are called
Answer: C. ultrasonic waves
10. A silent whistle used to train a dog has a frequency
Answer: B. greater than 20,000 Hz
11. Ultrasound is used in
Answer: A. prenatal scanning
12. In ultrasonic cleaning, high-frequency sound waves create
Answer: D. tiny bubbles that implode and clean the surface
13. In medical scanning, the device that sends and receives high-frequency sound is a
Answer: D. transducer
14. SONAR stands for
Answer: B. Sound Navigation and Ranging
15. A ship's sound wave returns after 14.7 s in the sea (speed 1500 m/s). The depth is
Answer: C. 11,025 m
16. Sonar signal with speed 1550 m/s returns after 5.3 s. The depth of the sea is
Answer: A. 4107.5 m
17. Infrasound is produced by
Answer: D. earthquakes, volcanic eruptions and explosions
18. The three main characteristics of sound are
Answer: B. pitch, loudness and quality
19. A high pitched sound has
Answer: C. a high frequency
20. Loudness is measured on the basis of the
Answer: A. amplitude of the sound wave
21. Loudness level is measured in
Answer: B. decibels
22. Pitch is independent of the
Answer: D. energy received by the ear per unit time
23. The quality or timbre of sound helps to distinguish between two sounds having the same
Answer: A. loudness and pitch
24. Quality of sound depends on the
Answer: C. waveform
25. Sounds from a piano or violin produce on the oscilloscope
Answer: D. complex waveforms
26. The speed of sound in air is approximately
Answer: A. 330 to 350 m/s
27. In air, the speed of sound increases with
Answer: B. increase in temperature
28. The speed of sound is fastest in
Answer: C. solids
29. The speed of sound is slowest in
Answer: A. gases
30. The speed of sound in steel is over
Answer: C. 5000 m/s
31. The speed of sound in water is approximately
Answer: B. 1500 m/s
32. If the frequency of sound is doubled, the speed of sound will
Answer: D. remain the same
33. Which is NOT true for sound?
Answer: D. Sound transfers energy along with matter of the medium
34. Sound travels fastest in
Answer: C. steel
35. Sound travels from water to an iron rod, then into air and back into water. The speed will successively
Answer: A. increase, decrease, increase
36. We see lightning before we hear thunder because
Answer: B. light travels much faster than sound
37. A boy hears thunder 3.0 s after seeing lightning (speed of sound 343 m/s). The distance to lightning is about
Answer: C. 1 km
38. Noise is a sound that is
Answer: B. non-rhythmic and unpleasant
39. Reflection of sound occurs when sound
Answer: A. bounces back from a surface
40. Sound waves change direction as they pass through layers of air with varying temperature. This is
Answer: D. refraction
41. When sound bends around obstacles or spreads out through small openings, it is called
Answer: D. diffraction
42. An echo is a reflected sound that
Answer: C. can be distinguished from the original sound
43. Human ear can perceive two separate sounds if the time gap between them is at least
Answer: B. 0.1 s
44. The minimum distance of a person from an obstacle to hear an echo (speed 340 m/s) is
Answer: A. 17 m
45. A boy hears an echo after 1.2 s (speed of sound 346 m/s). The distance of the cliff is
Answer: C. 207.6 m
46. A tourist hears an echo after 5 s (speed of sound 344 m/s). The cliff is at a distance of
Answer: D. 860 m
47. Reverberation is the
Answer: A. overlapping of sound caused by multiple reflections
48. Acoustic protection means using ______ to absorb unwanted sounds.
Answer: B. soft and porous materials
49. Soft materials on classroom walls are used to
Answer: D. reduce echo
50. In acoustics, bass traps are used to control
Answer: A. low-frequency sounds
About Physics Class 10 Unit 13 MCQs (Federal Board)
These 59 Physics MCQs cover Class 10 Unit 13: Sound of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. The questions are split over 2 pages of 50. You can also read the Sound notes for this chapter. Download the Sound MCQs as a PDF using the button at the top of this page.