Pipes And Cisterns MCQ Set 1

Showing question 1 to 5 of total 30 MCQs

Solve the question on your notebook and check it by clicking (Answer and Explanation) below question.

Question No: 1

Two pipes A and B can fill a tank in 20 and 30 minutes respectively. If both the pipes are used together, then how long it will take to fill the tank ?

1. 10 mins
2. 12 mins
3. 15 mins
4. 20 mins

Question No: 2

A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time cistern will get filled ?

1. 7 hours
2. 7.1 hours
3. 7.2 hours
4. 7.3 hours

Question No: 3

A tap can fill a tank in 6 hours. After half the tank is filled then 3 more similar taps are opened. What will be total time taken to fill the tank completely.

1. 2 hours 30 mins
2. 2 hours 45 mins
3. 3 hours 30 mins
4. 3 hours 45 mins

Answer: D

Explanation

Half tank will be filled in 3 hours

Lets calculate remaining half,

Part filled by the four taps in 1 hour = 4 × (1/6) = 2/3

Remaining part after 1/2 filled = 1-1/2 = 1/2

Total time = 3 hours + 45 mins = 3 hours 45 mins

Question No: 4

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

1. 6 min to empty
2. 7 min to full
3. 6 min to full
4. 7 min to empty

Question No: 5

Pipe A can fill a tank in 5 hours, pipe B in 10 hours and pipe C in 30 hours. If all the pipes are open, in how many hours will the tank be filled ?

1. 2.5 hours
2. 2 hours
3. 3.5 hours
4. 3 hours

Answer: D

Explanation

Part filled by A in 1 hour = 1/5

Part filled by B in 1 hour = 1/10

Part filled by C in 1 hour = 1/30

Part filled by (A+B+C) in 1 hour =

So all pipes will fill the tank in 3 hours.