Rational Numbers One Mark Questions

8th Standard EM

    Reg.No. :
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Maths

Time : 00:30:00 Hrs
Total Marks : 20
    5 x 1 = 5
  1. Multiplicative inverse of 0 (is)

    (a)

    0

    (b)

    1

    (c)

    -1

    (d)

    does not exist

  2. Which of the following illustrates the inverse property for addition?

    (a)

    \(\frac { 1 }{ 8 } -\frac { 1 }{ 8 } =0\)

    (b)

    \(\frac { 1 }{ 8 } +\frac { 1 }{ 8 } =\frac { 1 }{ 4 } \)

    (c)

    \(\frac { 1 }{ 8 } +0=\frac { 1 }{ 8 } \)

    (d)

    \(\frac { 1 }{ 8 } -0=\frac { 1 }{ 8 } \)

  3. Closure property is not true for division of rational numbers because of the number

    (a)

    0

    (b)

    -1

    (c)

    0

    (d)

    \(\frac { 1 }{ 2 } \)

  4. \(\frac { 1 }{ 2 } -\left( \frac { 3 }{ 4 } -\frac { 5 }{ 6 } \right) \neq \left( \frac { 1 }{ 2 } -\frac { 3 }{ 4 } \right) -\frac { 5 }{ 6 } \) illustrates that subtraction does not satisfy the ________ property for rational numbers.

    (a)

    commutative

    (b)

    closure

    (c)

    distributive

    (d)

    associative

  5. \(\left( 1-\frac { 1 }{ 2 } \right) \times \left( \frac { 1 }{ 2 } -\frac { 1 }{ 4 } \right) \div \left( \frac { 3 }{ 4 } -\frac { 1 }{ 2 } \right) \)=

    (a)

    \(\frac { 1 }{ 2 } \)

    (b)

    \(\frac { 3 }{ 4 } \)

    (c)

    \(\frac { 1 }{ 4 } \)

    (d)

    \(\frac { -1 }{ 2 } \)

  6. 5 x 1 = 5
  7. The multiplicative inverse of \(2\frac { 3 }{ 5 } \) is _____________

    ()

    \(\frac { 5 }{ 13 } \)

  8. If -3 x \(\frac { -6 }{ 11 } \) = \(\frac { -6 }{ 11 } \times x\) is _______________  

    ()

    -3

  9. If distributive property is true for \(\left( \frac { 3 }{ 5 } \times \frac { -4 }{ 9 } \right) +\left( x\times \frac { 15 }{ 17 } \right) =\frac { 3 }{ 5 } \times (y+z)\) then x, y, z are ________ , ________ and ________.

    ()

    \(\frac { 3 }{ 5 } \)\(\frac { -4 }{ 9 } \) and \(\frac { 15 }{ 17 } \)

  10. If \(x\times \frac { -55 }{ 63 } =\frac { -55 }{ 63 } \times x=1\) then x is called the _______________ of \(\frac { 55 }{ 63 } \)

    ()

    Multiplicative Inverse

  11. The multiplicative inverse of -1 is ________.

    ()

    -1

  12. 5 x 1 = 5
  13. \(\frac { -7 }{ 8 } \times \frac { -23 }{ 27 } =\frac { -23 }{ 27 } \times \frac { -7 }{ 8 } \) illustrates the closure property of rational numbers

    (a) True
    (b) False
  14. Associative property is not true for subtraction of rational numbers.

    (a) True
    (b) False
  15. The additive inverse of \(\frac { -11 }{ -17 } \) is \(\frac { 11 }{ 17 } \)

    (a) True
    (b) False
  16. The product of two negative rational numbers is a positive rational number.

    (a) True
    (b) False
  17. The multiplicative inverse exists for all rational numbers

    (a) True
    (b) False
  18. 5 x 1 = 5
  19. \(\left( \frac { 5 }{ 6 } +-1 \right) +\frac { -3 }{ 4 } =\frac { 5 }{ 6 } +\left( -1+\frac { -3 }{ 4 } \right) \)

  20. (1)

    a rational number

  21. \(\frac { -1 }{ 3 } \left( \frac { 1 }{ 4 } +\frac { 2 }{ 3 } \right) =\left( \frac { -1 }{ 3 } \times \frac { 1 }{ 4 } \right) +\left( \frac { -1 }{ 3 } \times \frac { 2 }{ 3 } \right) \)

  22. (2)

    does not exist

  23. \(\frac { -4 }{ 9 } \times \frac { 9 }{ -4 } =\frac { 9 }{ -4 } \times \frac { -4 }{ 9 } =1\)

  24. (3)

    associative property of addition

  25. \(\frac { 1 }{ 0 } \)

  26. (4)

    distributive property of multiplication over addition

  27. \(\frac { 22 }{ 7 } \)

  28. (5)

    multiplicative inverse property

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