As we all know SBI PO is here and we are ready with the 80 days plan in which we provide you daily quizzes on new pattern questions with different topics that will help you to go through this exam.
So, here we are with the Most important questions of Pipe and Cisterns.

Q1. A cistern can be filled with water by a pipe in 5 hours and it can be emptied by a second pipe in 4 hours. If both the pipes are opened when the cistern is full, the time in which it will be emptied the cistern.
(a) 9 hours
(b) 18 hours
(c) 20 hours
(d) 20.5 hours
(e) none of these

Q2. A pipe can fill a tank with water in 3 hours. Due to a leakage in bottom, it takes 3 1/2 hours to fill it. In what time the leak will empty the fully filled tank?
(a) 12 hours
(b) 21 hours
(c) 6.5 hours
(d) 10.5 hours
(e) none of these

Q3. A pipe can empty a tank in 40 minutes. A second pipe with diameter twice as much as that of the first is also attached with the tank to empty it. The two pipe together can empty the tank in:
(a) 8 minutes
(b) 13 (1/3) minutes
(c) 30 minutes
(d) 38 minutes
(e) none of these

Q4. Two pipes can fill a tank with water in 15 and 12 hours respectively and a third pipe can empty it in 4 hours. If the pipes be opened in order at 8, 9 and 11 a.m. respectively, the tank will be emptied at
(a) 11 : 40 a.m.
(b) 12 : 40 p.m.
(c) 1 : 40 p.m.
(d) 2 : 40 p.m.
(e) none of these

Q5. 12 pumps working 6 hours a day can empty a completely filled reservoir in 15 days. How many such pumps working 9 hours a day will empty the same reservoir in 12 days?
(a) 15
(b) 9
(c) 10
(d) 12
(e) none of these

Q6. A tank can be filled with water by two pipes, A and B together in 36 minutes. If the pipe B was stopped after 30 minutes, the tank is filled in 40 minutes. The pipe B can alone fill the tank in
(a) 45 minutes
(b) 60 minutes
(c) 75 minutes
(d) 90 minutes
(e) none of these

Q7. A tank has a leak which would empty the completely filled tank in 10 hours. If the tank is full of water and a tap is opened which admits 4 litres of water per minute in the tank, the leak takes 15 hours to empty the tank. How many litres of water does the tank hold?
(a) 2400 l
(b) 4500 l
(c) 1200 l
(d) 7200 l
(e) none of these

Q8. A boy and girl together fill a cistern with water. The boy pours 4 litres of water every 3 minutes and the girl pours 3 litres of water every 4 minutes. How much time will it take to fill 100 litres of water in the cistern?
(a) 36 minutes
(b) 42 minutes
(c) 48 minutes
(d) 44 minutes
(e) none of these

Q9. Three pipes A, B and C can fill a cistern in 6 hours. After working as it together for 2 hours, C is closed and A and B fill it in 7 hours more. The time taken by C alone to fill the cistern is
(a) 14 hours
(b) 15 hours
(c) 16 hours
(d) 17 hours
(e) none of these

Q10. A cistern is normally filled in 8 hours but takes another 2 hours longer to fill because of a leak in this bottom. If the cistern is full, the leak will empty it in:
(a) 16 hours
(b) 20 hours
(c) 25 hours
(d) 40 hours
(e) none of these

Q11. A tank can be filled by pipe A in 2 hours and pipe B in 6 hours. At 10 am pipe A was opened. At what time will the tank be filled if pipe B is opened at 11 A.M.?
(a) 12.45 A.M.
(b) 5 P.M.
(c) 11.45 A.M.
(d) 12 P.M.
(e) none of these

Q12. Two pipes X and Y can fill a cistern in 24 minutes and 32 minutes respectively. If both the pipes are opened together, then after how much time (in minutes) should Y be closed so that the tank is full in 18 minutes?
(a) 10
(b) 8
(c) 6
(d) 5
(e) none of these

Q13. Three pipes A, B and C can fill a tank in 6 hours, 9 hours and 12 hours respectively. B and C are opened for half an hour, then A is also opened. The time taken by the three pipes together to fill the remaining part of the tank is:
(a) 3 hours
(b) 2 hours
(c) 2.5 hours
(d) 3.5 hours
(e) none of these

Q14. A cistern is provided with two pipes A and B. A can fill it in 20 minutes and B can empty it in 30 minutes. If A and B be kept open alternatively for one minute, each, how soon will the cistern be filled?
(a) 121 minutes
(b) 110 minutes
(c) 115 minutes
(d) 120 minutes
(e) none of these

Q15. Pipe A can fill a tank in 4 hours and pipe B can fill it in 6 hours. If they are opened on alternate hours and if pipe A is opened first then in how many hours, the tank shall be full?
(a) 4 (1/2)
(b) 4 (2/3)
(c) 3 (1/2)
(d) 3 (1/4)
(e) none of these

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