A loud sound can be distinguished from a faint sound by its MCQ with Answer and Explanation
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Question #1
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A car accelerates uniformly from 18 km/h to 36 km/h in 5 seconds. The distance covered is
Correct Answer: Option B
Explanation:
Convert speeds: 18 km/h = 5 m/s, 36 km/h = 10 m/s. Using v = u + at => a = (10-5)/5 = 1 m/s². Distance s = ut + ½at² = 5×5 + ½×1×25 = 25 + 12.5 = 37.5 m. Also using average velocity: (5+10)/2 × 5 = 7.5×5 = 37.5 m. Answer A.
Convert speeds: 18 km/h = 5 m/s, 36 km/h = 10 m/s. Using v = u + at => a = (10-5)/5 = 1 m/s². Distance s = ut + ½at² = 5×5 + ½×1×25 = 25 + 12.5 = 37.5 m. Also using average velocity: (5+10)/2 × 5 = 7.5×5 = 37.5 m. Answer A.
Question #2
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The power of a lens is measured in
Question #3
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The minimum distance to hear an echo (persistence of hearing 0.1 s, speed 340 m/s) is
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