1. An echo occurs when
A. sound is reflected from a distant surface.
B. sound is transmitted through a surface.
C. the sound waves are very large.
D. All of the above
2. What is the main reason why you can hear noises a long distance away
over water at night?
A. There are fewer other noises at night.
B. Water conducts sound better at night.
C. Water bounces off sound better at night
D. Sound waves are bent towards the cool air over the water.
3. A sound wave is
A. a mechanical wave
C. a transverse wave
B. not an electromagnetic wave D. a longitudinal wave
4.Sound waves cannot travel in
A. Air B Water
C. steel D. vacuum
5. Why a lot of people love to sing inside the bathroom except.
A. because of privacy
B. because the bathroom creates an aurally pleasing acoustic
environment
C. because of resonance
D. because the small dimension of the bathroom makes someone
comfortable
6. The change in speed of sound when it encounters a medium of different
density is called
A. Diffraction
B. interference
C.refraction
D. reflection
7. Which of the following quantities tells how hot or cold an object is with
respect to some standard?
A. density B. mass
C. pressure D. temperature
8.. Reverberation does not occur when
A. the floor is carpeted
B. the floor is smooth and shiny.
C. the windows are covered with curtains
D. both A and C
9. Which of the following is the best transmitter of sound?
A. Steel-in cabinet
B. Water in the ocean
C. Air in your classroom​