1. What is the speed of sound in air at room temperature (20°C)?
a) 123 m/s
b) 330 m/s
c) 343 m/s
d) 500 m/s
Answer: c) 343 m/s
2. What is the unit of frequency for sound waves?
a) Hertz (Hz)
b) Decibel (dB)
c) Meter (m)
d) Watt (W)
Answer: a) Hertz (Hz)
3. Which property of a sound wave determines its pitch?
a) Amplitude
b) Frequency
c) Speed
d) Wavelength
Answer: b) Frequency
4. What is the phenomenon called when two sound waves of slightly different frequencies interfere with each other, producing a fluctuating sound?
a) Echo
b) Doppler Effect
c) Beats
d) Resonance
Answer: c) Beats
5. What is the term for the bouncing back of sound waves from a surface?
a) Refraction
b) Reflection
c) Diffraction
d) Absorption
Answer: b) Reflection
6. What is the term for the gradual reduction in the amplitude of a sound wave as it travels through a medium?
a) Reverberation
b) Absorption
c) Diffraction
d) Interference
Answer: b) Absorption
7. What is the range of human hearing, in terms of frequency?
a) 0 Hz to 500 Hz
b) 20 Hz to 20,000 Hz
c) 100 Hz to 10,000 Hz
d) 1 Hz to 100,000 Hz
Answer: b) 20 Hz to 20,000 Hz
8. Which term describes the increase in sound intensity as sound waves pass through a narrow opening?
a) Diffraction
b) Reflection
c) Resonance
d) Refraction
Answer: a) Diffraction
9. What is the term used to describe the loudness of a sound?
a) Pitch
b) Frequency
c) Amplitude
d) Intensity
Answer: d) Intensity
10. What type of wave is a sound wave?
a) Transverse wave
b) Longitudinal wave
c) Electromagnetic wave
d) Surface wave
Answer: b) Longitudinal wave
11. What happens to the speed of sound when it travels from air into water?
a) Speed decreases
b) Speed remains the same
c) Speed increases
d) Speed fluctuates
Answer: c) Speed increases
12. What is the Doppler Effect in sound waves?
a) The change in frequency of a wave in relation to an observer moving relative to the source of the wave
b) The bouncing back of sound waves from a surface
c) The bending of sound waves around obstacles
d) The loss of sound energy as it travels
Answer: a) The change in frequency of a wave in relation to an observer moving relative to the source of the wave
13. What is the principle behind a musical instrument producing sound?
a) Reflection
b) Resonance
c) Diffraction
d) Absorption
Answer: b) Resonance
14. What is the effect of increasing the amplitude of a sound wave?
a) The sound becomes softer
b) The pitch of the sound changes
c) The sound becomes louder
d) The speed of sound increases
Answer: c) The sound becomes louder
15. How does the temperature of the air affect the speed of sound?
a) The speed decreases as the temperature increases
b) The speed remains constant regardless of temperature
c) The speed increases as the temperature increases
d) The speed decreases as the temperature decreases
Answer: c) The speed increases as the temperature increases