Pipes And Cisterns MCQ Set 2

Showing question 6 to 10 of total 30 MCQs

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

Question No: 6

Pipes A and B can fill a tank in 5 hours and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in.

Answer: B

Explanation

Question No: 7

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. The capacity of the tank (in litres) is

1. 5780 litres
2. 5770 litres
3. 5760 litres
4. 5750 litres

Answer: C

Explanation

Question No: 8

An electric pump can fill a tank in 3 hours. Because of a leak in the tank, it took 3 hours 30 min to fill the tank. In what time the leak can drain out all the water of the tank and will make tank empty ?

1. 10 hours
2. 13 hours
3. 17 hours
4. 21 hours

Answer: D

Explanation

We can get the answer by subtracting work done by leak in one hour by subtraction of

filling for 1 hour without leak and with leak, as

Work done for 1 hour without leak = 1/3

Work done with leak =

So tank will be empty by the leak in 21 hours.

Question No: 9

A tank can be filled by a tap in 20 minutes and by another tap in 60 minutes. Both the taps are kept open for 10 minutes and then the first tap is shut off. After this, the tank will be completely filled in what time ?

1. 10 mins
2. 15 mins
3. 20 mins
4. 25 mins

Answer: C

Explanation

How we can solve this question ? First we will calculate the work done for 10 mins, then we will get the remaining work, then we will find answer with one tap work, As Part filled by Tap A in 1 min = 1/20 Part filled by Tap B in 1 min = 1/60 (A+B)'s 10 mins work =

Question No: 10

A cistern can be filled in 9 hours but due to a leak at its bottom it takes 10 hours. If the cistern is full, then the time that the leak will take to make it empty will be ?

1. 20 hours
2. 19 hours
3. 90 hours
4. 80 hours