Pipes and Cisterns questions and answers

20 questions in 2 online tests, each with its answer and a worked solution.

Start Test 1

Pipes and Cisterns: key points

Pipes and cisterns are time-and-work problems where filling is positive work and emptying is negative work.

  • A pipe filling a tank in t hours does 1/t work per hour.
  • Add rates for pipes working together.
  • Subtract the outlet rate from the inlet rate.

How to practise Pipes and Cisterns

Start with the key points, then take one Pipes and Cisterns test without rushing. Review every explanation, note the steps you missed and repeat the topic against the clock. APTITUDE TESTER has 20 questions in 2 tests for this topic.

  • Read the method before attempting a timed test.
  • Record mistakes by type: concept, calculation or time management.
  • Return to the hardest questions after a day and try them again.

Continue with another Quantitative topic when your accuracy is steady.

Pipes and Cisterns online tests

Sample Pipes and Cisterns questions

  1. 1. A pipe fills a tank in 12 hours. What fraction of the tank does it fill in one hour?
    1. 1/13
    2. 12
    3. 1/6
    4. 1/12

    Reference: q-d09a7ecd-85 · Report this question

    Show answer and solution

    Answer: D. 1/12

    One hour's work = 1/12 of the tank.
  2. 2. Two pipes fill a tank separately in 10 and 7 hours. How long together?
    1. 4.62
    2. 4.12
    3. 2.62
    4. 3.62

    Reference: q-9157efa4-71 · Report this question

    Show answer and solution

    Answer: B. 4.12

    Combined rate = 1/10 + 1/7; time = 10×7/(10+7) = 4.12 hours.
  3. 3. A pipe fills a tank in 8 hours and an outlet empties it in 14 hours. How long together?
    1. 18.17
    2. 18.67
    3. 19.67
    4. 17.67

    Reference: q-11aa24be-88 · Report this question

    Show answer and solution

    Answer: B. 18.67

    Net rate = 1/8 − 1/14; time = 18.67 hours.

See all the questions of Test 1

Pipes and Cisterns: questions people ask

How many Pipes and Cisterns questions are there?

There are 20 Pipes and Cisterns questions in 2 tests. Each test has its own page that lists the questions with their answers and solutions.

How long does a Pipes and Cisterns test take?

A test of 10 questions has a time limit of 15 minutes, which is 90 seconds a question.

Is there negative marking?

Rules vary by set. The rules screen shows the time limit, marks, any wrong-answer penalty and calculator permission before you begin. Feedback mode has no time limit or negative marking.

Can I practise Pipes and Cisterns without a time limit?

Yes. Choose practice mode: there is no clock, and the answer and solution appear as soon as you select an option.