1 What is the term for a sound with frequency higher than 20,000 Hz? A Ultrasound B Infrasonic C Audible D Hypersonic
2 What is the phenomenon of sound bending around obstacles called? A Reflection B Refraction C Diffraction D Echo
3 What is the time period of a sound wave? A The time for one complete cycle B The number of cycles per second C The speed of the wave D The displacement of particles
4 What is the amplitude of a sound wave? A The distance between two consecutive compressions B The maximum displacement of particles from their mean position C The number of vibrations per second D The speed of the wave
6 How does the density of a medium affect the speed of sound? A Higher density increases speed B Higher density decreases speed C Density has no effect D Only temperature affects speed
7 What is the process of using ultrasound to locate objects underwater called? A Sonar B Radar C Echolocation D Ultrasonography
8 What happens when the frequency of a sound matches the natural frequency of an object? A Destructive interference B Resonance C Reflection D Refraction
9 What is the effect of humidity on the speed of sound? A Speed decreases with humidity B Speed increases with humidity C Humidity has no effect on speed D Speed becomes zero with high humidity
11 What is the loudness of a sound directly proportional to? A Frequency B Wavelength C Square of amplitude D Speed
14 What happens to pitch when frequency increases? A Pitch decreases B Pitch increases C Pitch remains unchanged D Pitch becomes inaudible
15 What happens to the loudness of sound when amplitude increases? A It decreases B It increases C It remains the same D It becomes zero
16 What is the phenomenon of two sounds overlapping to produce a varying loudness called? A Resonance B Beats C Interference D Echo
17 What is the principle behind stethoscope? A Reflection of sound B Multiple reflection of sound C Refraction of sound D Absorption of sound
18 What is the term for multiple reflections of sound? A Echo B Reverberation C Resonance D Diffraction
19 What is the method of finding depth of sea using sound called? A Echolocation B Sonar C Radar D Ultrasonography
20 What is the use of sound waves in SONAR? A To detect obstacles and measure distances underwater B To produce sound in musical instruments C To measure temperature D To communicate with satellites
21 Which of the following produces sound in a guitar? A Wood B Vibrating strings C Air inside the body D The player's fingers
23 What is the condition for formation of a stationary wave? A Two waves of equal frequency and amplitude traveling in opposite directions B Two waves of different frequencies traveling in the same direction C A single wave in a vacuum D A wave passing through a medium
24 What happens to the speed of sound as temperature increases? A It decreases B It increases C It stays the same D It becomes zero
25 What is the use of ultrasound in industry? A To clean delicate objects B To measure distance C To detect flaws in metal objects D All of the above