1.
What is the speed of sound in steel approximately?
A
1500 m/s
B
343 m/s
C
6000 m/s
D
5000 m/s
View Answer
Correct Answer: C — 6000 m/s
Explanation:
The speed of sound in steel is approximately 6000 m/s.
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What is the speed of sound in steel approximately?
1500 m/s
343 m/s
6000 m/s
5000 m/s
Correct Answer: C — 6000 m/s
Explanation:
The speed of sound in steel is approximately 6000 m/s.
Why is the speed of sound in solids higher than in gases?
Particles in solids are closely packed
Solids are more rigid
Solids are more elastic
All of the mentioned
Correct Answer: D — All of the mentioned
Explanation:
Close particle packing, rigidity, and elasticity make sound travel faster in solids.
Which of the following is an example of infrasonic sound?
Whale sounds
Earthquake tremors
Bat communication
Human speech
Correct Answer: B — Earthquake tremors
Explanation:
Earthquake tremors produce infrasonic waves with frequencies below 20 Hz.
What principle is used in SONAR for navigation?
Reflection of sound
Diffraction of sound
Interference of sound
Refraction of sound
Correct Answer: A — Reflection of sound
Explanation:
SONAR uses the reflection of sound waves to detect underwater objects.
What happens to sound waves when they hit a hard surface?
They are refracted
They are diffracted
They are absorbed
They are reflected
Correct Answer: D — They are reflected
Explanation:
Sound waves reflect from hard surfaces.
What is the persistence of sound due to multiple reflections called?
Echo
Diffraction
Reverberation
Refraction
Correct Answer: C — Reverberation
Explanation:
Reverberation is caused by repeated reflections of sound.
When is an echo heard?
When sound is absorbed
When the reflected sound reaches after 1/10th of a second
When the source of the sound is moving
When the sound is reflected
Correct Answer: B — When the reflected sound reaches after 1/10th of a second
Explanation:
An echo is heard when reflected sound reaches the listener after a noticeable time gap.
In which medium is the speed of sound the highest?
Solids
Gases
Liquids
Vacuum
Correct Answer: A — Solids
Explanation:
Sound travels fastest in solids because particles are closely packed.
What is the speed of sound in water?
1200 m/s
343 m/s
5000 m/s
1500 m/s
Correct Answer: D — 1500 m/s
Explanation:
The speed of sound in water is approximately 1500 m/s.
Sound waves are examples of what type of waves?
Electromagnetic waves
Surface waves
Longitudinal waves
Transverse waves
Correct Answer: C — Longitudinal waves
Explanation:
Sound waves are longitudinal because particles vibrate parallel to the direction of wave propagation.
What is the approximate speed of sound in air at room temperature?
400 m/s
343 m/s
330 m/s
220 m/s
Correct Answer: B — 343 m/s
Explanation:
The speed of sound in air at room temperature is approximately 343 m/s.