Pipes and Cistern Aptitude MCQ Questions with Answers

Question. Two pipes A and B can fill a tank in 20 minutes and 30 minutes respectively. If both pipes are opened together, the time taken to fill the tank is ?
a) 50 minutes
b) 12 minutes
c) 25 minutes
d) 15 minutes

Answer : B

Question. Three Taps A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is ?
a) 10
b) 12
c) 14
d) 16

Answer : C

Question. Two pipes can fill a cistern separately in 10 hours and 15 hours. They can together fill the cistern in ?
a) 6 hours
b) 7 hours
c) 8 hours
d) 9 hours

Answer : A

Question. Two pipes can fill a tank in 15 hours and 20 hours respectively, while the third can empty it in 30 hours. If all the pipes are opened simultaneously, the empty tank will be filled in ?
a) 10 hours
b) 12 hours
c) 15 hours
d) 15 and 1/2 hours

Answer : B

Question. One tap can fill a water tank in 40 minutes and another tap can make the filled tank empty in 60 minutes. If both the taps are open, in how many hours will the empty tank be filled ?
a) 2 hours
b) 2.5 hours
c) 3 hours
d) 3.5 hours

Answer : A

Question. 3/4 part of a tank is full of water. When 30 litres of water is taken out, the tank becomes empty. The capacity of the tank is ?
a) 36 litres
b) 42 litres
c) 40 litres
d) 38 litres

Answer : C

Question. A tap can fill a cistern in 40 minutes and a second tap can empty the filled cistern in 60 minutes. By mistake without closing the second tap, the first tap was opened. In how many minutes will the empty cistern be filled ?
a) 72
b) 84
c) 108
d) 120

Answer : D

Question. A pipe can fill a tank in 24 hrs. Due to a leakage in the bottom, it is filled in 36 hrs. If the tank is half full, how much time will the leak take to empty the tank ?
a) 48 hrs
b) 72 hrs
c) 36 hrs
d) 24 hrs

Answer : C

Question. 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 together can empty the tank in ?
a) 8 minutes
b) 13 and 1/3 minutes
c) 30 minutes
d) 38 minutes

Answer : A

Question. 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

Answer : B

Question. Two pipes A and B can fill a water tank in 20 and 24 minutes respectively and a third pipe C can empty at the rate of 3 gallons per minute. If A, B and C are opened together to fill the tank in 15 minutes, the capacity (in gallons) of the tank is ?
a) 180
b) 150
c) 120
d) 60

Answer : C

Question. A cistern has two pipes. One can fill it with water in 8 hours and other can empty it in 5 hours. In how many hours will the cistern be emptied if both the pipes are opened together when 3/4 of the cistern is already full of water ?
a) 13 and 1/3 hours
b) 10 hours
c) 6 hours
d) 3 and 1/3 hours

Answer : B

Question. Two pipes A and B can fill a tank in 36 minutes and 45 minutes respectively. Another pipe C can empty the tank in 30 minutes. First A and B are opened. After 7 minutes, C is also opened. The tank is filled up in ?
a) 39 minutes
b) 46 minutes
c) 40 minutes
d) 45 minutes

Answer : B

Question. Pipe A can fill a cistern in 6 hours and pipe B can fill it in 8 hours. Both the pipes are opened simultaneously, but after two hours, pipe A is closed. How many hours will B take to fill the remaining part of the cistern ?
a) 2 hrs
b) 3 and 1/3 hrs
c) 2 and 2/3 hrs
d) 4 hrs

Answer : B

Question. A pump can fill a tank with water in 2 hours. Because of a leak in the tank it was taking 2 and 1/3 hours to fill the tank. The leak can drain all the water off the tank in ?
a) 8 hours
b) 7 hours
c) 14 hours
d) 4 and 1/3 hours

Answer : C

Question. 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

Answer : D

Question. Two pipes A and B can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes, pipe A is turned off. What is the total time required to fill the tank ?
a) 10 min. 20 sec
b) 11 min. 45 sec
c) 12 min. 30 sec
d) 14 min. 40 sec

Answer : D

Question. Two pipes can fill a cistern in 3 hours and 4 hours respectively and a waste pipe can empty it in 2 hours. If all the three pipes are kept open, then the cistern will be filled in ?
a) 5 hours
b) 8 hours
c) 10 hours
d) 12 hours

Answer : D

Question. Tank is normally filled in 9 hours but takes four hours longer to fill because of a leak in its bottom. If the tank is full, the leak will empty it in ?
a) 32.5 hrs
b) 29.25 hrs
c) 30.30 hrs
d) 31 hrs

Answer : B

Question. 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 ?
a) 85 min
b) 95 min
c) 105 min
d) 100 min

Answer : D

Question. Pipes P and Q can fill a tank in 10 and 12 hours respectively and C can empty it in 6 hours. If all the three are opened at 7 a.m., at what time will one-fourth of the tank be filled ?
a) 10 a.m
b) 10 p.m
c) 11 p.m
d) 11 a.m

Answer : C

Question. Three pipes A, B and C can fill a cistern in 6 hours. After working at 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

Answer : A

Question. One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, the slower pipe alone will be able to fill the tank in ?
a) 81 minutes
b) 108 minutes
c) 144 minutes
d) 192 minutes

Answer : C

Question. A pipe can fill a tank in ‘x’ hours and another pipe can empty it in‘y’ (y > x) hours. If both the pipes are open, in how many hours will the tank be filled ?
a) (x – y) hours
b) (y – x) hours
c) xy/x - y hours
d) xy/y - x hours

Answer : D

Question. A leak in the bottom of a tank can empty the full tank in 6 hours. An inlet pipe fills water at the rate of 4 litres a minute. When the tank is full, the inlet is opened and due to the leak the tank is empty in 8 hours. Find the capacity of the tank ?
a) 5760 litres
b) 96 litres
c) 10 litres
d) 24 litres

Answer : A

Question. Three taps A, B, C can fill an overhead tank in 4, 6 and 12 hours respectively. How long would the three taps take to fill the tank if all of them are opened together ?
a) 2 hrs
b) 4 hrs
c) 3 hrs
d) 5 hrs

Answer : A

Question. A tap can empty a tank in 30 minutes. A second tap can empty it in 45 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank ?
a) 30 minutes
b) 18 minutes
c) 14 minutes
d) 15 minutes

Answer : B

Question. Three pipes P, Q and R can separately fill a cistern in 4,8 and 12 hours respectively. Another pipe S can empty the completely filled cistern in10 hours. Which of the following arrangements will fill the empty cistern in less time than others ?
a) Q alone is open
b) P and S are open
c) P, R and S are open
d) P, Q and S are open

Answer : D

Question. 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 ?
a) 20 hrs
b) 28 hrs
c) 36 hrs
d) 40 hrs

Answer : A

Question. One fill pipe A is 3 times faster than second fill pipe B and takes 32 minutes less than the fill pipe B. When will the cistern be full if both pipes are opened together ?
a) 6 min
b) 8 min
c) 12 min
d) 10 min

Answer : C

Question. Two pipes, P and Q, together can fill a cistern in 20 minutes and P alone can in 30 minutes. Then Q alone can fill the cistern in ?
a) 62 minutes
b) 60 minutes
c) 61 minutes
d) 51 minutes

Answer : B

Question. 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 ?
a) 4 hours
b) 4 hours 15 minutes
c) 3 hours 15 minutes
d) 3 hours 45 minutes

Answer : D

Question. A tap takes 36 hours extra to fill a tank due to a leakage equivalent to half of its inflow. The inflow can fill the tank in how many hours ?
a) 36 hrs
b) 24 hrs
c) 30 hrs
d) 18 hrs

Answer : D

Question. 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

Answer : A

Question. Three pipes A, B and C can fill a tank in 6 hours. After working together for 2 hours, C is closed and A and B fill the tank in 8 hours. The time (in hours) in which the tank can be filled by pipe C alone is ?
a) 10
b) 12
c) 8
d) 9

Answer : B

Question. 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 alternately for one minute each, how soon will the cistern be filled ?
a) 121 minutes
b) 110 minutes
c) 115 minutes
d) 120 minutes

Answer : C

Question. A water tank can be filled by a tap in 30 minutes and another tap can fill it in 60 minutes. If both the taps are kept open for 5 minutes and then the first tap is closed, how long will it take for the tank to be full
a) 20 minutes
b) 45 minutes
c) 25 minutes
d) 30 minutes

Answer : B

Question. One pipe can fill a tank three times as fast as another pipe. If together the two pipes can fill the tank in 36 min, then the slower alone will be able to fill the tank in ?
a) 81 min
b) 108 min
c) 144 min
d) 192 min

Answer : C

Question. Pipe A fills a tank in 30 minutes. Pipe B can fill the same tank 5 times as fast as pipe A. If both the pipes were kept open when the tank is empty, how much time will it take for the tank to overflow ?
a) 3 minutes
b) 2 minutes
c) 4 minutes
d) 5 minutes

Answer : D

Question. 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 and 1/2 hours
d) 3 and 1/2 hours

Answer : C

Question. A pipe of diameter d can drain a certain water tank in 40 minutes. The time taken by a pipe of diameter 2d for doing the same job in ?
a) 5 minutes
b) 10 minutes
c) 20 minutes
d) 80 minutes

Answer : B

Question. A tank can be filled by two pipes in 20 minutes and 30 minutes respectively. When the tank was empty, the two pipes were opened. After some time, the first pipe was stopped and the tank was filled in 18 minutes. After how much time of the start was the first pipe stopped ?
a) 5 minutes
b) 8 minutes
c) 10 minutes
d) 12 minutes

Answer : B

Question. 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, in how many hours, the tank shall be full ?
a) 4 and 1/2
b) 3 and 1/2
c) 3 and 1/4
d) 4 and 2/3

Answer : D

Question. A tap can empty a tank in one hour. A second tap can empty it in 30 minutes. If both the taps operate simultaneously, how much time is needed to empty the tank ?
a) 20 minutes
b) 30 minutes
c) 40 minutes
d) 45 minutes

Answer : A

Question. If 3/5 th of a cistern is filled in 1 minute, the time needed to fill the rest is ?
a) 40 sec
b) 30 sec
c) 36 sec
d) 24 sec

Answer : A

Question. Three pipes A, B and C can fill a tank in 6 hours. After working together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is ?
a) 10
b) 12
c) 14
d) 16

Answer : C

Question. A tank has two pipes. The first pipe can fill it in 4 hours and the second can empty it in 16 hours. If two pipes be opened together at a time, then the tank will be filled in ?
a) 5 and 1/2 hours
b) 10 hours
c) 6 hours
d) 5 and 1/3 hours

Answer : D

Question. 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 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

Answer : C

Question. A tap can fill a cistern in 8 hours and another tap can empty it in 16 hours. If both the taps are open, the time (in hours) taken to fill the tank will be ?
a) 8
b) 10
c) 16
d) 24

Answer : C

Question. If 1/3 of a tank holds 80 litres of water, then the quantity of water that 1/2 tank holds is ?
a) 240 litres
b) 120 litres
c) 80/3 litres
d) 100 litres

Answer : B

Question. Two pipes can independently fill a bucket in 20 minutes and 25 minutes. Both are opened together for 5 minutes after which the second pipe is turned off. What is the time taken by the first pipe alone to fill the remaining portion of the bucket ?
a) 11 minutes
b) 16 minutes
c) 20 minutes
d) 15 minutes

Answer : A

Question.A tap can fill an empty tank in 12 hours and another tap can empty half the tank in 10 hours. It both the taps are opened simultaneously, how long would it take for the empty tank to be filled to half its capacity ?
a) 30 hours
b) 20 hours
c) 15 hours
d) 12 hours

Answer : A

Question. 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 is ?
a) 9 hours
b) 18 hours
c) 20 hours
d) 20 and 1/2 hours

Answer : C

Question. A pipe can fill a cistern in 9 hours. Due to a leak in its bottom, the cistern fills up in 10 hours. If the cistern is full, in how much time will it be emptied by the leak ?
a) 70 hours
b) 80 hours
c) 90 hours
d) 100 hours

Answer : C

Question. A tank can be filled by pipe A in 2 hours and pipe B in 6 hours. At 10 A.M. 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

Answer : C

Question.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

Answer : C

Question. There are two pumps to fill a tank with water. First pump can fill the empty tank in 8 hours, while the second in 10 hours. If both the pumps are opened at the same time and kept open for 4 hours, the part of tank that will be filled up is ?
a) 9/10
b) 1/10
c) 2/5
d) 1/5

Answer : A

Question. A cistern is normally filled in 8 hours but takes another 2 hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty it in ?
a) 16 hours
b) 20 hours
c) 25 hours
d) 40 hours

Answer : D

Question. A tap drips at a rate of one drop/ sec. 600 drops make 100ml. The number of litres wasted in 300 days is ?
a) 4320000
b) 432000
c) 43200
d) 4320

Answer : D

Question. Two pipes A and B can fill a cistern in 37 and 1/2 minutes and 45 minutes respectively. Both pipes are opened. The cistern will be filled just in half an hour, if the pipe B is turned off after ?
a) 15 minutes
b) 10 minutes
c) 5 minutes
d) 9 minutes

Answer : D