Square Root and Cube Root questions and answers

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

Start Test 1

Square Root and Cube Root: key points

Root questions ask for the number which, when multiplied by itself or itself twice, gives the stated value.

  • √(a²) = a for positive a.
  • ∛(a³) = a.
  • Learn perfect squares and cubes to improve speed.

How to practise Square Root and Cube Root

Start with the key points, then take one Square Root and Cube Root 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.

Square Root and Cube Root online tests

Sample Square Root and Cube Root questions

  1. 1. Find √16.
    1. 5
    2. 6
    3. 1
    4. 4

    Reference: q-5aa92c5-10 · Report this question

    Show answer and solution

    Answer: D. 4

    The positive square root of 16 is 4.
  2. 2. Find the cube root of 343.
    1. 6
    2. 5
    3. 7
    4. 4

    Reference: q-82bc325-27 · Report this question

    Show answer and solution

    Answer: C. 7

    7³ = 343, so its cube root is 7.
  3. 3. Find √(36 × 49).
    1. 44
    2. 39
    3. 43
    4. 42

    Reference: q-7184b5a2-17 · Report this question

    Show answer and solution

    Answer: D. 42

    √(a²b²) = ab = 6×7 = 42.

See all the questions of Test 1

Square Root and Cube Root: questions people ask

How many Square Root and Cube Root questions are there?

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

How long does a Square Root and Cube Root 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 Square Root and Cube Root 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.