Sound: Vibration and Reflection

What is the primary cause of sound generation according to the passage?

• Vibration of objects

• Reflection of sound waves

• Intensity of sound

• Movement of air

Which of the following actions does NOT generate sound?

• Knocking

• Plucking

• Blowing

• Listening

What phenomenon occurs when sound waves hit a hard surface?

• Absorption

• Diffraction

• Echo

• Refraction

Which animals use ultrasound for navigation and locating prey?

• Cats

• Bats

• Dogs

• Birds

What is one method mentioned in the passage to reduce sound pollution?

• Increasing traffic

• Building more roads

• Enforcing noise pollution laws

• Ignoring noise complaints