Rational Numbers One Mark Questions

8th Standard

    Reg.No. :
  •  
  •  
  •  
  •  
  •  
  •  

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 _____________

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

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

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

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

    -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 ________.

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

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

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

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

    Multiplicative Inverse

  11. The multiplicative inverse of -1 is ________.

    A PHP Error was encountered

    Severity: Warning

    Message: A non-numeric value encountered

    Filename: material/details.php

    Line Number: 1002

    ()

    -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)

    does not exist

  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)

    associative property of addition

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

  24. (3)

    a rational number

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

  26. (4)

    multiplicative inverse property

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

  28. (5)

    distributive property of multiplication over addition

*****************************************

Reviews & Comments about 8th Maths Unit 1 Rational Numbers One Mark Question and Answer

Write your Comment