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#### Rational Numbers One Mark Questions

8th Standard EM

Reg.No. :
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Maths

Time : 01:00:00 Hrs
Total Marks : 20
5 x 1 = 5
1. Which of the following rational numbers is the greatest?

(a)

$\frac { -17 }{ 24 }$

(b)

$\frac { -13 }{ 16 }$

(c)

$\frac { 7 }{ -8 }$

(d)

$\frac { -31 }{ 32 }$

2. Which of the following pairs is equivalent?

(a)

$\frac { -20 }{ 12 } ,\frac { 5 }{ 3 }$

(b)

$\frac { 16 }{ -30 } ,\frac { -8 }{ 15 }$

(c)

$\frac { -18 }{ 36 } ,\frac { -20 }{ 44 }$

(d)

$\frac { 7 }{ -5 } ,\frac { -5 }{ 7 }$

3. $\frac { 3 }{ 4 } \div \left( \frac { 5 }{ 8 } +\frac { 1 }{ 2 } \right)$

(a)

$\frac { 13 }{ 10 }$

(b)

$\frac { 2 }{ 3 }$

(c)

$\frac { 3 }{ 2 }$

(d)

$\frac { 5 }{ 8 }$

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

(a)

0

(b)

-1

(c)

0

(d)

$\frac { 1 }{ 2 }$

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. $\frac { -19 }{ 5 }$ lies between the integers ______________ and ________________

()

-4 and -3

8. The rational number that is represented by 0.44 is __________.

()

$\frac { 11 }{ 25 }$

9. The standard form of $\frac { +58 }{ -78 }$ is ______________

()

$\frac { -29 }{ 39 }$

10. The value of $\frac { -5 }{ 12 } +\frac { 7 }{ 15 }$ = ________________

()

$\frac { 1 }{ 20 }$

11. The value of $\left( \frac { -15 }{ 23 } \right) \div \left( \frac { +30 }{ -46 } \right)$ is _____________

()

1

12. 5 x 1 = 5
13. The rational numbers that are equal to their additive inverses are 0 and –1.

(a) True
(b) False
14. $\frac { -7 }{ 8 } \times \frac { -23 }{ 27 } =\frac { -23 }{ 27 } \times \frac { -7 }{ 8 }$ illustrates the closure property of rational numbers

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

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

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

(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)

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)

distributive property of multiplication over addition

25. $\frac { 1 }{ 0 }$

26. (4)

multiplicative inverse property

27. $\frac { 22 }{ 7 }$

28. (5)

a rational number