Class 8 Rational Numbers CBSE Questions & Answers

Class 8 · Rational Numbers

This is Mathematics Class 8 Rational Numbers CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
A number which can be written in the form\(\frac{p}{q}\), where p and q are _______ and \(q \ne {\text{ }}0\) is called a rational number.
  • A
    negative number
  • B
    integers
    Correct
  • C
    irrational number
  • D
    none of these
2
_______ are closed under addition.
  • A
    none of these
  • B
    Irrational numbers
  • C
    Negative numbers
  • D
    Rational numbers
    Correct
3
________ is not associative for rational numbers.
  • A
    Addition or Division
  • B
    Subtraction or Division
    Correct
  • C
    Multiplication or Division
  • D
    Addition or Multiplication
4
1 is the __________ for rational numbers.
  • A
    Addition of zero
  • B
    additive identity
  • C
    multiplicative identity
    Correct
  • D
    none of these
5
Find: \(\frac{{ - 4}}{5} \times \frac{3}{7} \times \frac{{15}}{{16}} \times \left( {\frac{{ - 14}}{9}} \right)\)
  • A
    1
  • B
    \(\frac{1}{2}\)
    Correct
  • C
    0
  • D
    2
6
Find a rational number between \(\frac{1}{4}\) and \(\frac{1}{2}\).
  • A
    \(\frac{1}{2}\)
  • B
    2
  • C
    0
  • D
    \(\frac{3}{8}\)
    Correct
7
Name the property under multiplication used in\(\frac{{ - 1}}{5} \times \frac{1}{2} = \frac{1}{2} \times \frac{{ - 1}}{5}\).
  • A
    Multiplicative identity
  • B
    Commutative property
    Correct
  • C
    none of these
  • D
    Associative property
8
\(\frac{1}{2}{\text{ }} \times {\text{ 1 }} = {\text{ }}\_\_\_\_\_\_\_\)
  • A
    1
  • B
    0
  • C
    \(\frac{1}{2}\)
    Correct
  • D
    2
9
Write the additive inverse of\(\frac{6}{7}\).
  • A
    1
  • B
    \(\frac{6}{7}\)
  • C
    0
  • D
    \( - \frac{6}{7}\)
    Correct
10
Find the multiplicative inverse of\(\frac{2}{9}\).
  • A
    \(\frac{2}{9}\)
  • B
    \(\frac{9}{2}\)
    Correct
  • C
    \( - \frac{2}{9}\)
  • D
    \( - \frac{9}{2}\)
11
_____ is the only rational number that is equal to its reciprocal.
  • A
    \(\frac{1}{2}\)
  • B
    0
  • C
    2
  • D
    1
    Correct
12
A number which can be written in the form, \(\frac{p}{q}\) where p and q are integers and _____ is called a rational number.
  • A
    \(q \ne {\text{ }}0\)
    Correct
  • B
    q = 1
  • C
    none of these
  • D
    q = 0
13
_________ are closed under subtraction.
  • A
    Irrational numbers
  • B
    Rational numbers
    Correct
  • C
    none of these
  • D
    Negative numbers
14
The product of two rational numbers is always a _______.
  • A
    rational number
    Correct
  • B
    irrational number
  • C
    None of these
  • D
    negative number
15
Zero has ________ reciprocal.
  • A
    none of these
  • B
    2
  • C
    1
  • D
    no
    Correct