Pipes And Cisterns MCQ Set 4

Showing question 16 to 20 of total 30 MCQs

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Question No: 16

Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A is opened first, in how many hours, the tank shall be full ?

1. 3 hours
2. 5 hours
3. 7 hours
4. 10 hours

Answer: B

Explanation

(A+B)'s 2 hour's work when opened =

Now, its A turn in 5^th hour

1/6 work will be done by A in 1 hour

Total time = 4 + 1 = 5 hours

Question No: 17

There are two pipes which are functioning simultaneouly to fill a tank in 12 hours, if one pipe fills the tank 10 hours faster than other then how many hours second pipe will take to fill the tank ?

1. 30 hours
2. 35 hours
3. 40 hours
4. 42 hours

Answer: A

Explanation

Lets suppose tank got filled by first pipe in X hours,

So, second pipe will fill the tank in X + 10 hours.

Question No: 18

If one is added to the numerator of the fraction it becomes one. If one is added to the denominator of the fraction it becomes 1/2. The fraction is?

1. 1/2
2. 3/5
3. 2/3
4. 2/5

Question No: 19

If x + 5y = 16 and x= -3y, then y =

1. -24
2. -8
3. 8
4. 2

Question No: 20

Which of the following fraction is greater than 2/3 and less than 4/5 ?

1. 1/2
2. 9/10
3. 3/4
4. 5/6