The decimal expansion of an irrational number may be

Non-terminating and non-recurring

Either terminating or non- terminating

The product of a rational and an irrational numbers is:

Sometimes rational and sometimes irrational

Rational Numbers & Irrational Numbers Quiz

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| By Catherine Halcomb

Catherine Halcomb

Community Contributor

Quizzes Created: 1382 | Total Attempts: 6,148,923

Questions: 10 | Attempts: 1,150 | Updated: Mar 21, 2023

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Rational Numbers & Irrational Numbers Quiz - Quiz

How do you know if a number is rational or irrational? Is 4/5 rational or irrational? Check out our online quiz and attempt some amazing questions to unleash the maths expert.

Questions and Answers

1.

The decimal expansion of an irrational number may be
- A.
  
  Terminating
- B.
  
  Recurring
- C.
  
  Either terminating or non- terminating
- D.
  
  Non-terminating and non-recurring
Correct Answer
D. Non-terminating and non-recurring

Explanation
An irrational number is a number that cannot be expressed as a fraction of two integers. The decimal expansion of an irrational number is non-terminating, meaning it goes on forever without repeating a pattern. Additionally, it is non-recurring, meaning there is no sequence of digits that repeats indefinitely. Therefore, the decimal expansion of an irrational number is both non-terminating and non-recurring.

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2.

The product of a rational and an irrational numbers is:
- A.
  
  Always an integer
- B.
  
  Always an irrational number
- C.
  
  Always a rational number
- D.
  
  Sometimes rational and sometimes irrational
Correct Answer
B. Always an irrational number

Explanation
When a rational number (a number that can be expressed as a fraction) is multiplied by an irrational number (a number that cannot be expressed as a fraction), the result is always an irrational number. This is because multiplying a rational number by an irrational number introduces new irrational components that cannot be simplified or expressed as a fraction. Therefore, the product of a rational and an irrational number is always an irrational number.

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3.

The number is
- A.
  
  An irrational number
- B.
  
  A rational number
- C.
  
  not a natural number
- D.
  
  None of these
Correct Answer
B. A rational number

Explanation
A rational number is a number that can be expressed as a fraction, where the numerator and denominator are both integers. Since the question does not provide any specific number, it is not possible to determine if it is a rational number or not. Therefore, the answer "none of these" is the most appropriate.

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2
0
4.

For rationalising the denominator of the expression we multiply and divide by
- A.
- B.
  
  12
- C.
- D.
Correct Answer
D.

Explanation
To rationalize the denominator of an expression, we multiply both the numerator and denominator by the conjugate of the denominator. In this case, the conjugate of the denominator is 12. By multiplying and dividing by 12, we can eliminate any irrational terms in the denominator and simplify the expression.

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2
0
5.

On simplifying we get
- A.
  
  12
- B.
- C.
- D.
Correct Answer
D.
6.

0.6666 in p/q form is
- A.
  
  6/99
- B.
  
  2/3
- C.
  
  3/5
- D.
  
  1/66
Correct Answer
B. 2/3

Explanation
The decimal number 0.6666 can be expressed as a fraction in p/q form as 2/3.

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7.

Which of the following is irrational?
- A.
  
  0.14
- B.
  
  0.24014001400014…
- C.
  
  0.14161416......
- D.
  
  0.1416
Correct Answer
B. 0.24014001400014…

Explanation
The number 0.24014001400014… is irrational because it is a non-repeating and non-terminating decimal. Irrational numbers cannot be expressed as a fraction or a ratio of two integers, and they have an infinite number of non-repeating decimal places. Therefore, the number 0.24014001400014… cannot be expressed as a fraction and is considered irrational.

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1
0
8.

The square root of which number is rational
- A.
  
  7
- B.
  
  1.01
- C.
  
  0.04
- D.
  
  13
Correct Answer
C. 0.04

Explanation
The square root of 0.04 is rational because it can be expressed as 0.2, which is a rational number.

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9.

(16)^3/4 is equal to
- A.
  
  2
- B.
  
  4
- C.
  
  8
- D.
  
  16
Correct Answer
C. 8

Explanation
The fraction 3/4 can be simplified by dividing the numerator (3) by the denominator (4). The result is 0.75, which can also be expressed as a whole number by multiplying it by 100. Therefore, 0.75 x 100 = 75. Since 75 is divisible by 8, the answer is 8.

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10.

A rational number between is
- A.
  
  1/14
- B.
  
  2/21
- C.
  
  5/14
- D.
  
  5/21
Correct Answer
D. 5/21

Explanation
The given question asks for a rational number between two unspecified numbers. The answer, 5/21, is a rational number because it can be expressed as a fraction, with 5 as the numerator and 21 as the denominator. It is also between the other given rational numbers, 1/14 and 2/21, as it falls between them when arranged in ascending order.

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