Range of Hearing; Ultrasound and SONARPractice Questions & MCQs
Practice Range of Hearing; Ultrasound and SONAR questions from Sound (Class 9 Science) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then practice the full set free on the RankByte app.
Range of Hearing; Ultrasound and SONARQuiz - Solve & Score
Q1. A research vessel surveying the Atlantic sends a sonar ping straight down; the echo from the seabed returns after 1.5 s. Taking the speed of sound in seawater as 1500 m/s, how deep is the ocean floor below the ship?
- A.2250 m
- B.562.5 m
- C.1125 m
- D.1000 m
Answer: C. 1125 m
The pulse travels down and back, so 2 x depth = v x t = 1500 x 1.5 = 2250 m. Depth = 1125 m.
Q2. An oceanographic ship maps the seabed by emitting a sonar pulse downward and timing the returning echo at 2 s. If sound moves at 1450 m/s in that water, what is the depth recorded?
- A.1450 m
- B.1500 m
- C.2900 m
- D.725 m
Answer: A. 1450 m
The pulse travels down and back, so 2 x depth = v x t = 1450 x 2 = 2900 m. Depth = 1450 m.
Q3. A submarine captain pings the bottom of a trench and hears the reflected pulse 3 s later. With sound travelling at 1400 m/s in the brine, how far down is the trench floor?
- A.1050 m
- B.466.667 m
- C.2100 m
- D.4200 m
Answer: C. 2100 m
The pulse travels down and back, so 2 x depth = v x t = 1400 x 3 = 4200 m. Depth = 2100 m.
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