Pipes and Cisterns PYQs for UPSC (2011-2024) | Solved Questions & PDF Download

Master Pipes and Cisterns problems for UPSC with solved Previous Year Questions (PYQs) from 2011 to 2024. This comprehensive guide provides step-by-step solutions, shortcut formulas, and a free downloadable PDF to help you crack all types of pipe and cistern problems in UPSC CSAT.

Why Pipes and Cisterns Matter in UPSC CSAT?

Pipes and cisterns questions are frequently asked in UPSC CSAT (Paper II) to test:

· Your ability to calculate work rates

· Understanding of time-based efficiency problems

· Skills in solving real-world scenario-based problems

This page covers all pipe and cistern PYQs with smart calculation techniques.

Year-Wise Pipes and Cisterns PYQs (2011-2024)

1. Two pipes A and B can independently fill a tank completely in 20 and 30 minutes respectively. If both the pipes are opened simultaneously, how much time will they take to fill the tank completely? [CSAT 2015]

(a) 10 minutes

(b) 12 minutes

(d) 25 minutes

Solution:

Given that,

Two pipes A and B can independently fill a tank completely in 20 and 30 minutes respectively.

Both the pipes are opened simultaneously.

Now,

Total work done = LCM of 20 and 30 = 60

Thus

Efficiency of pipe A = 60/20 = 3

Efficiency of Pipe B = 60/30 = 2

Total efficiency = 3 + 2 = 5

Therefore, total time taken = 60/5 = 12 minutes

Hence option (b) is correct

ANSWER KEY

1. B