Related Questions on Chapter 23: Sound Waves - Science Mcqs for Grade 7
Sounds of vehicles, aircrafts and machines are called
A. artificial sounds
B. natural sounds
C. noise
D. normal sounds
For communication astronauts use radio because
A. sound travels at very high speed in vacuum
B. sound does not travel in vacuum
C. vacuum repels sounds
D. sound energy turns into light in vacuum
In concert halls, soft materials and carpets are used to
A. increase sound waves
B. absorb sound waves
C. retract sound waves
D. refract sound waves
The pitch of the note depends upon the
A. tension on string
B. diameter of wind hole
C. tension on drum surface
D. diameter of drum surface