Chapter 14: Sound – Important MCQs
- Which of the following is essential for the propagation of sound?
a) Vacuum
b) Air
c) Light
d) Space
Answer: b) Air - The SI unit of frequency is –
a) Joule
b) Hertz
c) Meter
d) Decibel
Answer: b) Hertz - Sound cannot travel through –
a) Solid
b) Liquid
c) Gas
d) Vacuum
Answer: d) Vacuum - The time taken to complete one vibration is called –
a) Frequency
b) Wavelength
c) Amplitude
d) Time Period
Answer: d) Time Period - The speed of sound is maximum in –
a) Air
b) Water
c) Steel
d) Vacuum
Answer: c) Steel - Which characteristic of sound determines its pitch?
a) Amplitude
b) Frequency
c) Speed
d) Wavelength
Answer: b) Frequency - The amplitude of sound is related to its –
a) Loudness
b) Pitch
c) Quality
d) Velocity
Answer: a) Loudness - The sound having frequency less than 20 Hz is called –
a) Audible sound
b) Infrasonic sound
c) Ultrasonic sound
d) Supersonic sound
Answer: b) Infrasonic sound - What is the approximate speed of sound in air at room temperature (25°C)?
a) 330 m/s
b) 500 m/s
c) 300 m/s
d) 273 m/s
Answer: a) 330 m/s - Echo can be heard when the minimum distance between source and reflecting surface is –
a) 5 m
b) 10 m
c) 17 m
d) 20 m
Answer: c) 17 m - Ultrasound is used in –
a) Cooking
b) Hearing aids
c) Sonography
d) Electricity generation
Answer: c) Sonography - Which part of the human ear collects sound waves?
a) Cochlea
b) Ear drum
c) Pinna
d) Ear canal
Answer: c) Pinna
