Sound

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 sound produced by?

A Light waves B Vibrations C Heat energy D Magnetic fields

3

What is the source of sound in a human vocal system?

A Tongue B Lungs C Vocal cords D Lips

4

What is the characteristic of a musical sound that distinguishes it from a noise?

A Loudness B Pitch C Quality or timbre D Frequency

5

Which of the following produces sound in a guitar?

A Wood B Vibrating strings C Air inside the body D The player's fingers

6

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

7

What is the amplitude of a sound wave related to?

A Pitch B Loudness C Speed D Frequency

8

How does sound travel?

A As a transverse wave B As a longitudinal wave C As a surface wave D As an electromagnetic wave

9

What is the principle behind stethoscope?

A Reflection of sound B Multiple reflection of sound C Refraction of sound D Absorption of sound

10

What is the speed of sound in steel approximately?

A 343 m/s B 1500 m/s C 5000 m/s D 6000 m/s

11

What is the phenomenon of sound bending around obstacles called?

A Reflection B Refraction C Diffraction D Echo

12

What is the term for the change in frequency due to relative motion between source and observer?

A Doppler effect B Reflection C Refraction D Diffraction

13

What is the phenomenon of two sounds overlapping to produce a varying loudness called?

A Resonance B Beats C Interference D Echo

14

What is reflection of sound called?

A Refraction B Echo C Diffraction D Reverberation

15

What is the frequency of sound measured in?

A Hertz B Decibels C Meters per second D Newtons

16

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

17

What is the loudness of sound measured in?

A Hertz B Decibels C Joules D Watts

18

What is the method of finding depth of sea using sound called?

A Echolocation B Sonar C Radar D Ultrasonography

19

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

20

What is the unit of sound intensity level?

A Hertz B Decibel C Joule D Pascal

21

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

22

What is the speed of sound approximately in air at room temperature?

A 343 m/s B 1500 m/s C 5000 m/s D 300,000 km/s

23

What is the speed of sound in air affected by?

A Pressure only B Temperature and pressure C Humidity only D Temperature and humidity

24

What is the wavelength of a sound wave related to?

A Amplitude B Frequency C Loudness D Speed

25

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