Multiple choice

Water flows into a tank which is 0.2 km. long and 0.15 km. wide through a pipe of cross section 30 cm.×20 cm. at 20 km./hour. Then the time (in hours) for the water level in the tank to reach 16 m. is. किसी 0.2 किमी. लम्बे तथा 0.15 किमी. चौड़े टैंक में 30 सेमी. 20 सेमी. चौड़े पाइप से 20 किमी./घंटे की चाल से पानी गिरता है। पानी का तल 16 मी. ऊँचाई उठने में समय (घंटे में) ज्ञात कीजिए-

  1. 100

  2. 300

  3. 240

  4. 400
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Tank dimensions: 0.2 km × 0.15 km = 200 m × 150 m = 30000 m². Required volume for 16 m height: 30000 × 16 = 480000 m³. Pipe dimensions: 30 cm × 20 cm = 0.3 m × 0.2 m = 0.06 m². Flow speed: 20 km/hr = 20000 m/hr. Flow rate = 0.06 × 20000 = 1200 m³/hr. Time = 480000 ÷ 1200 = 400 hours. Answer D (400) is correct.

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