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Chapter 1 | Real Numbers | National Book Foundation

Welcome to Chapter 1 – Real Numbers (Class 9 Mathematics | NBF), your dedicated platform for mastering the fundamentals of real numbers through carefully designed, exam-focused MCQs.

Welcome to your

Chapter 1 | Real Numbers

April 18, 2026

Name

School

If $a \cdot b = 1$, what is $b$ called?

self-multiplicative inverse

additive identity

multiplicative identity

multiplicative inverse of $a$

None

Which number is self-multiplicative inverse?

$0$

$-1$

$-3$

$3$

None

If $a + b = a$, what is value of $b$?

$0$

$1$

$a$

$-1$

None

If $n = 8$ and $16 \times 2^{m} = 4^{\,n-8}$ then value of $m$ is:

$-4$

$0$

$8$

$-2$

None

The radical form of $x^{-\frac{3}{2}}$ is:

$\sqrt{x^3}$

$\sqrt[3]{\frac{1}{x^2}}$

$\dfrac{1}{\sqrt{x^3}}$

$\dfrac{1}{\sqrt[3]{x^2}}$

None

$a^{r-s} \div a^{s}$ is

$a^{r} \cdot a^{2s}$

$a^{r+2s}$

$a^{r-s}$

$\dfrac{a^{r}}{a^{2s}}$

None

According to reflexive property: $y^2 - 17 = ?$

$-17 - y^2$

$y^2 - 17$

$y - 17$

$y^2 + 17$

None

Additive inverse of $\sqrt{5}$ is:

$-\sqrt{5}$

$5$

$\dfrac{1}{\sqrt{5}}$

$-5$

None

$\sqrt[n]{ab}$ is equal to

$(ab)^{\frac{1}{n}}$

$n(ab)$

$\sqrt{ab}$

$(ab)^n$

None

Commutative property does not hold with respect to:

subtraction

both (a) and (b)

addition

multiplication

None

If $a > 0$, then $\sqrt{a}$ is

integer

rational

irrational

real

None

Given number $\sqrt{10}\cdot\sqrt{10}$ is:

Imaginary

Complex

Real

Irrational

None

$a(b + c - d)$ equals

$ab + ac + ad$

$a(b + c + d)$

$ab - ac - ad$

$ac + ab - ad$

None

1 out of 13

Time's up

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Mathematics Notes For All Classes and Boards – MathWorld by Rizwan Zafar
MatricLATEST
- 9th ClassNEW
- 10th ClassNEW
FSc SectionUPDATED
SolutionsUPDATED
Entry Test Preparation (ECAT)LATEST
MCQSUPDATED
Intelligence TestLATEST
University Admissions
- NUST UNIVERSITY
  - Undergraduate Program
Other Links
A Level Maths Solution BankUPDATED
MCQs BankUPDATED
Online MCQs Preparation | Class 12 | National Book Foundation

Entry Test Preparation

Entry Test Preparation

Mathematics Notes For All Classes and Boards – MathWorld by Rizwan Zafar
MatricLATEST
- 9th ClassNEW
- 10th ClassNEW
FSc SectionUPDATED
SolutionsUPDATED
Entry Test Preparation (ECAT)LATEST
MCQSUPDATED
Intelligence TestLATEST
University Admissions
- NUST UNIVERSITY
  - Undergraduate Program
Other Links
A Level Maths Solution BankUPDATED
MCQs BankUPDATED
Online MCQs Preparation | Class 12 | National Book Foundation

$mathworld.pk$

I am Rizwan Zafar, holding an MS in Mathematics, residing in Wah Cantt, Pakistan.

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