**Pipes and Cistern - Aptitude Questions and Answers | Online Pipes and Cistern MCQ Aptitude Test**

Quiz Name | Pipes and Cistern |

Category | Online Aptitude Test |

Number of Questions | 20 |

Time | 30 Minutes |

Exam Type | MCQ (Multiple Choice Questions) |

**1.**There are three pipes. In 30 minutes, 20 minutes, and 10 minutes, respectively, A, B, and C can fill a tank from empty to full. All three pipes are opened when the tank is empty. Chemical solutions P,Q, and R are discharged by A, B, and C, respectively. After 3 minutes, what is the proportion of solution R in the liquid in the tank?

a. 5/11

b. 6/11

c. 7/11

d. 8/11

**2.**Pipes A and B, respectively, can fill a tank in 5 and 6 hours. It may be emptied in 12 hours using Pipe C. The tank will be filled if all three pipes are opened simultaneously:

a. 1 13/17 hours

b.2 8/11hours

c. 3 9/17hours

d. 4 1/2hours

**3.**It takes a pump two hours to fill a tank with water. It took 2 hours to fill the tank due to a leak. The leak has the potential to drain the whole contents of the tank into:

a. 4 1/3hours

b. 7 hours

c. 8 hours

d. 14 hours

**4.**It takes 37 minutes and 45 minutes for two pipelines A and B to fill a cistern, respectively. Both of the pipes have been opened. If the B is switched off after: the cistern will be filled in less than half an hour.

a. 5min.

b. 9min.

c. 10min.

d. 15min.

**5.**Three pipes with a consistent flow fill a tank. The first two pipes fill the tank at the same time, while the third pipe fills the tank alone. The tank is filled 5 hours quicker by the second pipe and 4 hours slower by the third pipe. The first pipe takes the following amount of time:

a. 6hours

b. 10hours

c. 15hours

d. 30hours

**6.**A tank can be filled in 20 minutes and emptied in 24 minutes using two lines, and a waste pipe can empty 3 gallons per minute. Working together, the three pipes can fill the tank in 15 minutes. The tank has the following capacity:

a. 60gallons

b. 100gallons

c. 120gallons

d. 180gallons

**7.**Three pipes A, B, and C fill a tank in five hours. The pipe C is twice as fast as the pipe B, and the pipe B is twice as fast as the pipe A. How long will it take pipe A to fill the tank by itself?

a. 20hours

b. 25hours

c. 35hours

d. Cannot be determined

**8.**It takes four hours for two pipes A and B to fill a cistern. If they had been opened independently, it would have taken B 6 hours longer to fill the cistern than A. A will need how much time to fill the cistern separately?

a. 1hour

b. 2hour

c. 6hour

d. 8hour

**9.**Two pipelines A and B, respectively, can fill a tank in 20 and 30 minutes. How long will it take to fill the tank if both hoses are used together?

a. 12 min

b. 15 min

c. 25 min

d. 50 min

**10.**In 15 minutes and 20 minutes, two pipelines A and B can fill a tank, respectively. Both pipes are opened simultaneously, but pipe A is switched off after 4 minutes. How long will it take to fill the tank completely?

a. 10 min. 20 sec.

b. 11 min. 45 sec.

c. 12 min. 30 sec.

d. 14 min. 40 sec.

**11.**A single pipe can fill a tank three times faster than a second pipe. If the two pipes can fill the tank in 36 minutes while working together, the slower pipe can fill the tank in:

a. 81 min

b. 108 min

c. 144 min

d. 192 min

**12.**Two pipelines A and B can fill a big tanker in 60 minutes and 40 minutes, respectively. How long will it take to fill the tanker from an empty condition if B fills it half the time and A and B fill it together the other half?

a. 15min

b. 20min

c. 27.5min

d. 30min

**13.**It takes 6 hours for a tap to fill a tank. Three additional identical taps are unlocked once half of the tank has been filled. How long did it take to totally fill the tank?

a. 3 hrs 15 min

b. 3 hrs 45 min

c. 4 hrs

d. 4 hrs 15 min

**14.**Taps three times A, B, and C can each fill a tank in 12, 15, and 20 hours. The tank will be full in: if A is open all the time and B and C are open for one hour each alternately.

a. 6 hours

b. 6 2/3 hours

c. 7 hours

d. 7 1/2 hours

**15.**It takes six hours for three pipes A, B, and C to fill a tank. C is closed after 2 hours of joint effort, and A and B can fill the remaining half in 7 hours. C alone took the following amount of time to fill the tank:

a. 10

b. 12

c. 14

d. 16

**16.**How long will it take for the leak to drain the full cistern? I. Normally, the cistern is full in 9 hours. II. Due to a leak in the bottom, it takes an hour longer to fill the cistern than usual.

a. I alone sufficient while II alone not sufficient to answer

b. II alone sufficient while I alone not sufficient to answer

c. Either I or II alone sufficient to answer

d. Both I and II are necessary to answer

**17.**When both the input pipe A and the outlet pipe B are opened at the same time, how long will it take to empty the tank? I.In 16 minutes, I. A can fill the tank. II. B can drain a full tank in less than eight minutes.

a.I alone sufficient while II alone not sufficient to answer

b. II alone sufficient while I alone not sufficient to answer

c. Either I or II alone sufficient to answer

d. Both I and II are necessary to answer

**18.**How many hours would it take to fill the tank if both pipes are opened? I. The tank has a capacity of 400 litres. II. The pipe A takes 4 hours to fill the tank. III. The pipe B takes 6 hours to fill the tank.

a. Only I and II

b. Only II and III

c. All I, II and III

d. Any two of the three

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