#### Real Numbers One Mark Questions

9th Standard

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Maths

Time : 00:30:00 Hrs
Total Marks : 10
5 x 1 = 5
1. If n is a natural number then $\sqrt { n }$ is

(a)

always a natural number

(b)

always an irrational number

(c)

always a rational number

(d)

may be rational or irrational

2. Which of the following is not true?

(a)

Every rational number is a real number

(b)

Every integer is a rational number

(c)

Every real number is an irrational number

(d)

Every natural number is a whole number

3. Irrational number has a________________ .

(a)

terminating decimal

(b)

no decimal part

(c)

non-terminating and recurring decimal

(d)

non-terminating and non-recurring decimal

4. If $\frac { 1 }{ 7 }$= 0.142857, then the value of is______________.

(a)

0.285741

(b)

0.428571

(c)

0.285714

(d)

0.574128

5. Which of the following are not rational numbers?

(a)

$7\sqrt { 5 }$

(b)

$\frac { 7 }{ \sqrt { 5 } }$

(c)

$\sqrt { 36 } -9$

(d)

$\pi +2$

6. 5 x 1 = 5
7. The value of $3\sqrt { 3 } +\sqrt { 3 }$ is ______________.

()

$4\sqrt { 3 }$

8. The value of $\left[ \sqrt { { x }^{ 3 } } \right] ^{2/3}$ is

()

x

9. If $\sqrt { 10 }$= 3.1622, then the value of is $\frac { 1 }{ \sqrt { 10 } }$ is_________.

()

0.31623

10. The rational number equivalent to $\frac { 5 }{ 9 }$ such that its numerator is 25 is____________ .

()

$\frac { 25 }{ 45 }$

11. Divide $15\sqrt { 12 }$ by $3\sqrt { 3 }$the result is ___________.

()

10