Pipes And Cistern(Quantitative Aptitude ) Questions and answers for exam Preparation

Quantitative Aptitude

PIPES AND CISTERN MCQs

Pipes & Cisterns

Total Questions : 431 | Page 7 of 44 pages

Question 61. Water is continuously supplied from a reservoir to a locality at the steady rate of 10000 liters per hours. When delivery exceeds demand the excess water is stored in a tank. If the demand for 8 consecutive three hour periods is 10000, 10000, 45000, 25000, 40000, 15000, 60000 and 35000 liters respectively, what will be the minimum capacity required of the water tank (in thousand liters)to meet the demand and avoid any wastage?

Discuss Question

Answer: Option C. -> 40

Question 62. A pipe can fill a tank in x hours and another pipe can empty it in y (y > x) hours. If both pipes are open, in how many hours will the tank is filled?

(x - y) hours
(y - x) hours
$$\frac{{xy}}{{x - y}}$$ hours
$$\frac{{xy}}{{y - x}}$$ hours

Discuss Question

Answer: Option D. -> $$\frac{{xy}}{{y - x}}$$ hours

Question 63. A pipe can fill a tank with water in 3 hours. Due to leakage in bottom, it takes $$3\frac{1}{2}$$ hours to fill it. In what time the leak will empty the completely filled tank?

12 hours
21 hours
$$6\frac{1}{2}$$ hours
$$10\frac{1}{2}$$ hours

Discuss Question

Answer: Option B. -> 21 hours

Question 64. Two pipe 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-

5 hours
8 hours
10 hours
12 hours

Discuss Question

Answer: Option D. -> 12 hours

Question 65. $$\frac{3}{4}$$ part of the tank is full of water. When 30 litres of water is taken out, the tank becomes empty. The capacity of the tank is -

36 liters
42 liters
40 liters
38 liters

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Answer: Option C. -> 40 liters

Question 66. A tank with capacity T liters is empty. If water flows into the tank from pipe X at the rate of x liters per minute and water is pumped out by Y at the rate of y liters per minute and x > y, then how many minutes will the tank be filled?

(x - y) 60 T minutes
(T - x) minutes
$$\frac{{\text{T}}}{{{\text{x}} - {\text{y}}}}$$ minutes
$$\frac{{\text{T}}}{{{\text{y}} - {\text{x}}}}$$ minutes

Discuss Question

Answer: Option C. -> $$\frac{{\text{T}}}{{{\text{x}} - {\text{y}}}}$$ minutes

Question 67. A pipe can fill a tank in 3 hours. There are two outlet pipes from the tank which can empty it in 7 and 10 hours respectively. If all the three pipes are opened simultaneously, then the tank will be filled in -

8 hours
9 hours
10 hours
11 hours

Discuss Question

Answer: Option D. -> 11 hours

Question 68. A vessel has three pipes connected to it , two to supply liquid and one to draw liquid. The first alone can fill the vessel in $$4\frac{1}{2}$$ hours, the second in 3 hours and the third can empty it in $$1\frac{1}{2}$$ hours. If all the pipes are opened simultaneously when the vessel is half full, how soon will it be emptied?

$$4\frac{1}{2}$$ hours
$$5\frac{1}{2}$$ hours
$$6\frac{1}{2}$$ hours
None of these

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Answer: Option A. -> $$4\frac{1}{2}$$ hours

Question 69. Two pipe 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 open together to fill the tank in 15 minutes, find the capacity of tank?

180 gallons
150 gallons
120 gallons
60 gallons

Discuss Question

Answer: Option C. -> 120 gallons

Question 70. 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 in 10 hours. Which of the following arrangements will fill the empty cistern in less time than others?