CIE iGCSE Co-Ordinated Science P3.4 Sound Exam Style Questions Paper 1
Question
Which statement about sound is correct?
A An echo is produced by refraction of sound waves.
B The amplitude of a sound wave affects the pitch of a sound.
C The approximate range of audible frequencies for a human is 20 Hz–20kHz.
D Sound waves travel more quickly in a vacuum than in air.
▶️Answer/Explanation
Ans : C
Question
Two students conduct an experiment to determine the speed of sound in air.
They stand 639 m apart.
One student hits two blocks of wood together while the other uses a stop-watch to time how long
it takes for the sound to reach him.
It takes 1.80 s for the sound to reach the second student.
What is the speed of sound in air, calculated using these results?
(A) 330 m/s
(B) 355 m/s
(C) 710 m/s
(D) 1150 m/s
▶️Answer/Explanation
Ans : B
Question
The diagram is a displacement–time graph for the molecules in air as a sound wave passes.
The graphs below are drawn to the same scale.
Which graph represents a quieter sound with a higher pitch?
▶️Answer/Explanation
Ans : D
Question
A man stands 420 m away from a high wall. He bangs a drum once and starts a stop-watch at the
same time. When he hears an echo from the wall, the stop-watch reads 2.4 s.
What is the speed of sound, calculated from this information?
(A) 87.5 m / s (B) 175 m / s (C) 330 m / s (D) 350 m / s
▶️Answer/Explanation
Ans : D