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Class 10MathematicsReal NumbersIrrational numbersEasyLevel 14
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What type of number is (\sqrt{81})?

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Answer and explanation

Correct answer: Rational number

Step 1: (81) is a perfect square. Step 2: (\sqrt{81}=9), and (9) can be written as (\frac{9}{1}). Step 3: The square root of a perfect square is always rational.

Related tags

Real-NumbersRational-NumberPerfect-Square

Frequently asked questions

What is the correct answer to this question?

Rational number

Why is this the correct answer?

Step 1: (81) is a perfect square. Step 2: (\sqrt{81}=9), and (9) can be written as (\frac{9}{1}). Step 3: The square root of a perfect square is always rational.

Which subject and chapter does this question cover?

This is a Class 10 Mathematics question. Chapter: Real Numbers. Topic: Irrational numbers.

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10 more MCQs
  1. 1Which of the following numbers is irrational?
  2. 2Which of the following numbers is rational?
  3. 3What type of number is (\sqrt{16})?
  4. 4Which statement about (\sqrt{10}) is correct?
  5. 5Which of the following is an example of an irrational number?
  6. 6Which decimal form represents an irrational number?
  7. 7What type of number is (0.3333\ldots)?
  8. 8Which statement is correct about (0.101001000100001\ldots)?
  9. 9If (a) is a non-zero rational number and (b) is an irrational number, what type of number is (ab) generally?
  10. 10What type of number is (\sqrt{2}+3)?
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