MCQ questions for class 9 Science Chapter 12 Sound
Question 1: What type of wave is sound?
Transverse wave
Longitudinal wave
Electromagnetic wave
Mechanical wave
Question 2: In which medium does sound travel the fastest?
Air
Water
Wood
Steel
Question 3: What is the speed of sound in air at room temperature?
343 m/s
1500 m/s
330 m/s
1200 m/s
Question 4: The property of sound that allows us to distinguish between a shrill and a grave sound is:
Pitch
Frequency
Amplitude
Loudness
Question 5: What is the SI unit of frequency?
Hertz
Watt
Joule
Newton
Question 6: Which part of the ear amplifies the vibrations received from the eardrum?
Ear canal
Cochlea
Ossicles
Auditory nerve
Question 7: The sensation of a sound being high or low is called:
Amplitude
Loudness
Pitch
Frequency
Question 8: What is the range of frequencies that the average human ear can hear?
20 Hz to 20,000 Hz
1 Hz to 1,000 Hz
50 Hz to 5,000 Hz
100 Hz to 10,000 Hz
Question 9: Which of the following is an example of a musical instrument that produces sound through the vibration of strings?
Flute
Drum
Piano
Guitar
Question 10: The persistence of sound due to multiple reflections is called:
Refraction
Diffraction
Reverberation
Interference
Question 11: What causes the bending of sound waves around obstacles?
Reflection
Refraction
Diffraction
Interference
Question 12: The unit of amplitude is:
Hertz
Watt
Joule
Decibel
Question 13: What is the term for the minimum distance between successive compressions or rarefactions in a sound wave?
Amplitude
Wavelength
Frequency
Intensity
Question 14: Which type of material is a good conductor of sound?
Soft materials
Porcelain
Wood
Metal
Question 15: What is the term for the number of vibrations per second in a sound wave?
Amplitude
Wavelength
Frequency
Intensity
Question 16: Which of the following materials is a poor conductor of sound?
Water
Air
Metal
Wood
Question 17: What is the phenomenon of the change in frequency of a sound wave due to the relative motion between the source and the observer called?
Reverberation
Diffraction
Doppler effect
Interference
Question 18: What is the term for the rate of doing work?
Power
Energy
Force
Acceleration
Question 19: Which of the following statements is true about ultrasound?
It has frequencies below the audible range
It is used for cleaning delicate objects
It is used for communication
It travels slower than audible sound
Question 20: What is the approximate speed of sound in water?
343 m/s
1500 m/s
330 m/s
1200 m/s
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