Reflection of Sound and Echo MCQs
Practice Reflection of Sound and Echo multiple-choice questions from Sound Waves: Characteristics and Applications (Class 9 Science) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Reflection of Sound and EchoQuiz - Solve & Score
Q1. Why are the ceilings of large concert halls often curved?
- A.to reflect and spread sound evenly to all listeners
- B.to absorb all the sound
- C.to speed up the sound
- D.to change the pitch
Answer: A. to reflect and spread sound evenly to all listeners
Q2. Why must sound-ranging methods like SONAR use a medium such as water, while radar can work in space?
- A.sound needs a material medium but radar uses electromagnetic waves
- B.sound travels faster than radar waves
- C.water blocks radar so sound is used everywhere
- D.space has too much sound already
Answer: A. sound needs a material medium but radar uses electromagnetic waves
Q3. A wall is 330 m from a source of sound (v = 340 m/s). The time after which the echo is heard is:
- A.1.94 s
- B.0.97 s
- C.1.03 s
- D.2.44 s
Answer: A. 1.94 s
Given 330 m, 340 m, asked for the unknown. By t = 2d/v = 2x330/340 = 1.94 s. t = 2d/v = 2x330/340 = 1.94 s. Hence option A) 1.94 s. Others fail: option B) '0.97 s' fails since Sound goes and returns: 2d/v; option C) '1.03 s' fails since Time = 2d/v.
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