NCERT Class 9 Science MCQ Chapter 10 Sound Waves: Characteristics and Applications English Medium As Per New Syllabus. NCERT Class 9 Science MCQ Chapter 10 Sound Waves: Characteristics and Applications Notes to each chapter is provided in the list so that you can easily browse throughout different chapter NCERT Class 9 Science MCQ Chapter 10 Sound Waves: Characteristics and Applications Question Answer Download PDF and select needs one. CBSE Class 9 Science Multiple Choice Solutions.
NCERT Class 9 Science MCQ Chapter 10 Sound Waves: Characteristics and Applications
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Sound Waves: Characteristics and Applications
Chapter – 10
| MCQ |
Tick the Correct Options:
1. How is sound produced in an object?
(a) By heating it.
(b) By changing its colour.
(c) By vibrations.
(d) By cooling it.
Ans: (c) By vibrations.
2. In humans, sound is produced by the vibration of which of the following?
(a) Lips.
(b) Vocal cords.
(c) Nasal cavity.
(d) Teeth.
Ans: (b) Vocal cords.
3. A space where there is no material medium is referred to as:
(a) Atmosphere.
(b) Liquid.
(c) Vacuum.
(d) Solid.
Ans: (c) Vacuum.
4. Which experiment is commonly used to show that sound needs a medium to propagate?
(a) Gold foil experiment.
(b) Vacuum bell jar experiment.
(c) Tuning fork experiment.
(d) Slinky experiment.
Ans: (b) Vacuum bell jar experiment.
5. Can astronauts communicate directly by speaking to each other during a spacewalk?
(a) Yes, sound travels faster in space.
(b) Yes, sound travels as a transverse wave.
(c) No, because outer space is a near vacuum and sound cannot propagate.
(d) No, because their vocal cords do not vibrate in space.
Ans: (c) No, because outer space is a near vacuum and sound cannot propagate.
6. In a sound wave, the region where the air has a higher density compared to the average density is called a:
(a) Rarefaction.
(b) Trough.
(c) Crest.
(d) Compression.
Ans: (d) Compression.
7. The region of air with lower density (compared to the average density) in a sound wave is called:
(a) Rarefaction.
(b) Compression.
(c) Crest.
(d) Wavelength.
Ans: (a) Rarefaction.
8. What kind of waves are sound waves?
(a) Transverse waves.
(b) Longitudinal waves.
(c) Electromagnetic waves.
(d) Non-mechanical waves.
Ans: (b) Longitudinal waves.
9. In a longitudinal wave, how do the particles of the medium vibrate?
(a) Perpendicular to the direction of wave propagation.
(b) Parallel to the direction of wave propagation.
(c) Randomly in all directions.
(d) In circular motions.
Ans: (b) Parallel to the direction of wave propagation.
10. Waves that require a material medium for propagation are called:
(a) Mechanical waves.
(b) Electromagnetic waves.
(c) Light waves.
(d) Radio waves.
Ans: (a) Mechanical waves.
11. What is the distance between two consecutive compressions or two consecutive rarefactions called?
(a) Frequency.
(b) Amplitude.
(c) Wavelength.
(d) Time period.
Ans: (c) Wavelength.
12. What is the SI unit of wavelength?
(a) Hertz.
(b) Second.
(c) Metre.
(d) Decibel.
Ans: (c) Metre.
13. The number of density oscillations at a fixed point per unit time is known as:
(a) Amplitude.
(b) Frequency.
(c) Wavelength.
(d) Time period.
Ans: (b) Frequency.
14. What is the SI unit of frequency?
(a) Metre.
(b) Second.
(c) Hertz (Hz).
(d) Decibel (dB).
Ans: (c) Hertz (Hz).
15. The time taken for one complete density oscillation at a fixed point is defined as:
(a) Frequency.
(b) Amplitude.
(c) Time period.
(d) Wavelength.
Ans: (c) Time period.
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