A acoustic sensor records a sound wave. If the echo of the pulse reflects from an obstacle after 3 seconds, find the distance of the obstacle from the origin given the speed of sound is 340 m/s. MCQ with Answer and Explanation
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Question #1
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The ratio between the speeds of two cars is 4 : 5. If the first car covers a distance of 320 km in 4 hours, what is the speed of the second car?
Correct Answer: Option D
Explanation:
Speed of first car = 320 / 4 = 80 km/h. Ratio of speeds is 4:5, so 4 parts = 80 km/h => 1 part = 20 km/h. Speed of second car = 5 parts = 5 * 20 = 100 km/h.
Speed of first car = 320 / 4 = 80 km/h. Ratio of speeds is 4:5, so 4 parts = 80 km/h => 1 part = 20 km/h. Speed of second car = 5 parts = 5 * 20 = 100 km/h.
This question belongs to:
Maths
Time Speed and Distance
Question #2
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A sound wave travels at a speed of 340 m/s. Find the distance covered by the wave in 0.5 minutes.
Correct Answer: Option D
Explanation:
Time = 0.5 minutes = 30 seconds. Distance = Speed * Time = 340 * 30 = 10200 meters = 10.2 km.
Time = 0.5 minutes = 30 seconds. Distance = Speed * Time = 340 * 30 = 10200 meters = 10.2 km.
This question belongs to:
Maths
Time Speed and Distance
Question #3
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A baseline boat hull can row 12 km/h in still water. If the river current tracks a velocity of 4 km/h, find the exact sector distance covered downstream by the boat hull in 45 minutes flat.
Correct Answer: Option C
Explanation:
Downstream speed = 12 + 4 = 16 km/h. Time = 45 minutes = 45/60 = 0.75 hours = 3/4 hour. Distance covered = Speed * Time = 16 * (3/4) = 12 km.
Downstream speed = 12 + 4 = 16 km/h. Time = 45 minutes = 45/60 = 0.75 hours = 3/4 hour. Distance covered = Speed * Time = 16 * (3/4) = 12 km.
This question belongs to:
Maths
Time Speed and Distance
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