# PIPES AND CISTERNS

Pipes and cisterns topic is similar to time and work. A pipe is connected to a tank or cistern. It is used to fill or empty the tank; accordingly it is called an inlet (or) an outlet. Inlet pipe: A pipe that fills a tank or cistern is the inlet pipe. Outlet pipe: A pipe that empties a tank or cistern is the outlet pipe.

Model Questions

1. Two pipes can separately fill a tank in 20 min and 30 min respectively. If both pipes are opened simultaneously, then how long will it take to fill the tank?

1) 6 min                      2) 8 min                    3) 10 min

4) 12 min                   5) 15 min

Sol:

Ans: 4

2. Two pipes A and B can fill a tank independently in 16 hours and 24 hours respectively. 3 If the tank is already full and both the 8 pipes are opened simultaneously, in how much time they can (functioning together) fill the remaining tank? (in hours)

1) 6             2) 8           3) 10                   4) 4              5) 12

Sol:

Ans: 1

3. Two pipes can fill a tank in 12 hours and 18 hours respectively. A third pipe can empty the tank in 72 hours. If all the three pipes are opened and function simultaneously, then in how much time the tank will be full? (in hours)

1) 15              2) 6                 3) 12                     4) 8               5) 16

Sol:

Ans: 4

4. Two pipes can fill a tank in 12 min and 15 min, respectively and waste pipe can empty10 liters per min. All the three pipes working together can full the tank in 1 hour. Find the capacity of the tank.

1) 75 lt                    2) 120 lt                    3) 90 lt

4) 180 lt                      5) 150 lt

Sol:

Ans: 1

5. A tank has a leak which would empty it in 8 hours. A tap is turned on which admits 5 lt a min into the tank and it is now emptied in 10 h. How many liters does the tank hold?

1) 24000 lt             2) 12000 lt             3) 18000 lt

4) 16000 lt             5) 14000 lt

Sol:

Ans: 2

6. One pipe can fill a tank four times as fast as another pipe. If together the two pipes can fill the tank in 36 minutes, then the slower pipe alone will be able to fill the tank in.......

1) 180 min              2) 136 min                3) 126 min

4) 114 min              5) 145 min

Sol:

Ans: 1

7. Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?

1) 6 hrs              2) 2 hrs               3) 4 hrs

4) 3 hrs             5) 8 hrs

Sol:

Ans: 1

8. Two taps x and y can fill a tank in 24 min and 32 min respectively. Both the taps are opened simultaneously, after how many minutes y should be closed so that the tank is just filled in 18 min?

1) 6 min                  2) 8 min             3) 9 min

4) 10 min              5) 4 min

Sol:

Ans: 2

9. Two taps, A and B can fill a tank (of capacity 210 litres) in 24 hours and 14 hours respectively. If both the taps are opened simultaneously and after 4 hours both the taps are closed, what quantity of water is to be added to the tank to fill it completely? (in litres)

1) 112                    2) 132                      3) 115              4) 125              5) 136

Sol:

Ans: 3

10. A cistern has three pipes A, B and C. Pipes A and B can fill it in 6 and 4 h respectively, while pipe C can empty the completely filled cistern in 2 h. If the pipes are opened in order at 3:00 pm, 4:00 pm and 5:00 pm, respectively, at what time will the cistern be empty?

1) 12:00 am                      2) 11:00 pm                3) 1:00 am

4) 12:00 pm                     5) 10:00 am

Sol:

Ans: 1

11. There are two inlets A and B connected to a tank. A and B can fill the tank in 10 h and 12 h, respectively. If both the pipes are opened alternately for 1 h, starting from A, then how much time will the tank take to be filled?

Sol:

Ans: 3

12. Two pipes P and Q can fill a tank in 16 minutes and 24 minutes respectively. Pipe P was opened for 4 minutes. After that, it was closed and pipe Q was opened for 8 minutes. After 12 minutes, both pipes were opened. Then in how much time the tank will be full?

1) 12 min                   2) 16 min                  3) 17.6 min

4) 12.5 min              5) 14.5 min

Sol:

Ans: 2

13. A water tank has one inlet A and one outlet B. A takes 8 hours to fill the empty tank, when B is not open and B takes 10 hours to empty the full tank. If the tank is three- fifth full, how much time will it take to fill the tank completely when both A and B are opened simultaneously? (in hours)

Sol:

Ans: 4

14. One fill pipe A takes 3 minutes more to fill the cistern than two fill pipes A and B opened together to fill it. Second fill pipe B takes   minutes more to fill cistern than two fill pipes A and B opened together to fill it. When will the cistern be full if both pipes are opened simultaneously?

1) 7 minutes               2) 16 minutes
3) 8 minutes               4) 10 minutes
5) 12 minutes

Sol:

Ans: 3

Posted Date : 11-12-2021

గమనిక : ప్రతిభ.ఈనాడు.నెట్‌లో కనిపించే వ్యాపార ప్రకటనలు వివిధ దేశాల్లోని వ్యాపారులు, సంస్థల నుంచి వస్తాయి. మరి కొన్ని ప్రకటనలు పాఠకుల అభిరుచి మేరకు కృత్రిమ మేధస్సు సాంకేతికత సాయంతో ప్రదర్శితమవుతుంటాయి. ఆ ప్రకటనల్లోని ఉత్పత్తులను లేదా సేవలను పాఠకులు స్వయంగా విచారించుకొని, జాగ్రత్తగా పరిశీలించి కొనుక్కోవాలి లేదా వినియోగించుకోవాలి. వాటి నాణ్యత లేదా లోపాలతో ఈనాడు యాజమాన్యానికి ఎలాంటి సంబంధం లేదు. ఈ విషయంలో ఉత్తర ప్రత్యుత్తరాలకు, ఈ-మెయిల్స్ కి, ఇంకా ఇతర రూపాల్లో సమాచార మార్పిడికి తావు లేదు. ఫిర్యాదులు స్వీకరించడం కుదరదు. పాఠకులు గమనించి, సహకరించాలని మనవి.