pipes and cisterns MCQs – Page 2

Practise focused pipes and cisterns questions with marked answers for exam preparation and subject revision.

pipes and cisterns Mcqs

21. A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in?
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A. 40 hrs

B. 20 hrs

C. 25 hrs

D. 16 hrs

22. Two pipes can separately fill a tank in 20 and 30 hours respectively. Both the pipes are opened to fill the tank but when the tank is full, a leak develops in the tank through which one-third of water supplied by both the pipes goes out. What is the total time taken to fill the tank?
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A. 18 hrs

B. 16 hrs

C. 15 hrs

D. 12 hrs

23. Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full in_________?
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A. 7 hours

B. 7 1/2 hours

C. 6 2/3 hours

D. 6 hours

24. A cistern which could be filled in 9 hours takes one hour more to be filled owing to a leak in its bottom. If the cistern is full in what time will the leak empty it?
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A. 45 hrs

B. 60 hrs

C. 75 hrs

D. 90 hrs

25. A tap can fill a tank in 6 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?
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A. 4 hrs 15 min

B. 4 hrs

C. 3 hrs 45 min

D. 3 hrs 15 min

26. One top can fill a cistern in 2 hours and another can empty the cistern in 3 hours. How long will they take to fill the cistern if both the taps are opened?
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A. 5 Hours

B. 7 Hours

C. 8 Hours

D. 6 Hours

27. A large tanker can be filled by two pipes A and B in 60 minutes and 40 minutes respectively. How many minutes will it take to fill the tanker from empty state if B is used for half the time and A and B fill it together for the other half?
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A. 15 min

B. 20 min

C. 27.5 min

D. 30 min

28. A pipe can fill a cistern in 20 minutes whereas the cistern when fill can be emptied by a leak in 28 minutes. When both pipes are opened, find when the cistern will be full?
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A. 48 min

B. 70 min

C. 60 min

D. 80 min

29. One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill tank in 36 min, then the slower pipe alone will be able to fill the tank in?
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A. 108 min

B. 192 min

C. 81 min

D. 144 min

30. A water tank is two-fifth full. Pipe A can fill a tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?
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A. 6 min. to empty

B. 9 min. to empty

C. 9 min. to full

D. 6 min. to full

31. Three taps A, B and C can fill a tank in 12, 15 and 20 hours respectively. If A is open all the time and B and C are open for one hour each alternately, the tank will be full is_______?
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A. 6 hrs

B. 6 2/3 hrs

C. 7 1/2 hrs

D. 7 hrs

32. Two taps can separately fill a cistern 10 minutes and 15 minutes respectively and when the waste pipe is open, they can together fill it in 18 minutes. The waste pipe can empty the full cistern in?
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A. 23 min

B. 13 min

C. 7 min

D. 9 min

33. A cistern is normally filled in 8 hours but takes two hours longer to fill because of a leak in its bottom. If the cistern is full the leak will empty it in.
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A. 16 hrs

B. 40 hrs

C. 20 hrs

D. 25 hrs

34. Pipes A and B can fill a cistern in 8 and 24 minutes respectively. They are opened an alternate minutes. Find how many minutes, the cistern shall be full?
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A. 10 min

B. 6 min

C. 12 min

D. 19 min

35. Pipe A can fill a tank in 6 hours. Due to a leak at the bottom, it takes 9 hours for the pipe A to fill the tank. In what time can the leak alone empty the full tank?
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A. 16 hours

B. 15 hours

C. 17 hours

D. 18 hours

36. Two pipes A and B can separately fill a cistern in 60 min and 75 min respectively. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 min. In how much time, the third pipe alone can empty the cistern?
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A. 110 min

B. 90 min

C. 100 min

D. 120 min

37. A tank is filled by three pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same during which the tank is filled by the third pipe alone. The second pipe fills the tank 5 hours faster than the first pipe and 4 hours slower than the third pipe. The time required by the first pipe is?
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A. 10 hrs

B. 6 hrs

C. 15 hrs

D. 30 hrs

38. A tank is filled in eight hours by three pipes A, B and C. Pipe A is twice as fast as pipe B, and B is twice as fast as C. How much time will pipe B alone take to fill the tank?
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A. 36 hours

B. 32 hours

C. 28 hours

D. 24 hours

39. Two pipes A and B can separately fill a cistern in 10 and 15 minutes respectively. A person opens both the pipes together when the cistern should have been was full he finds the waste pipe open. He then closes the waste pipe and in another 4 minutes the cistern was full. In what time can the waste pipe empty the cistern when fill?
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A. 8 min

B. 10 min

C. 7 min

D. 9 min

40. Two pipes A and B can fill a cistern in 37 1/2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled in just half an hour, if the pipe B is turned off after?
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A. 15 min

B. 9 min

C. 5 min

D. 10 min

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