Real Numbers Quiz - CBSE Class 9 Mathematics

Free practice quiz: Real Numbers (CBSE Class 9 Mathematics). 17 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. What is the least integer greater than the square root of 15?

   1. 3
   2. 4
   3. 5
   4. 6
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   Answer: B. 4

   The square root of 15 is approximately 3.87, so the least integer greater than this is 4.

2. The number √81 can be classified as:

   1. Rational
   2. Irrational
   3. Neither
   4. Both Rational and Irrational
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   Answer: A. Rational

   √81 = 9, which is a whole number and thus a rational number.

3. What is the product of the square roots of 16 and 25?

   1. 20
   2. 15
   3. 10
   4. 5
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   Answer: A. 20

   The square roots of 16 and 25 are 4 and 5, respectively. Their product is 4 x 5 = 20.

4. Simplify the expression √50 + √32.

   1. 5√2 + 4√2
   2. 6√2
   3. √82
   4. 9√2
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   Answer: D. 9√2

   √50 = 5√2 and √32 = 4√2. Therefore, √50 + √32 = 5√2 + 4√2 = 9√2.

5. Which number is not a real number?

   1. 0
   2. -1
   3. i
   4. √4
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   Answer: C. i

   i represents the imaginary unit, which is not a real number.

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