MCQ Questions | Class 8 Maths Chapter 9 | Algebraic Expressions and Identities with Answers

MCQ | Algebraic Expressions and Identities Class 8

Check the below NCERT MCQ Questions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities with Answers Pdf free download. MCQ Questions for Class 8 Maths with Answers were prepared based on the latest exam pattern. We have Provided Algebraic Expressions and Identities Class 8 Maths MCQs Questions with Answers to help students understand the concept very well.

Objective Question | NCERT Maths Class 8

NCERT Solutions Class 8 Maths
Book:	National Council of Educational Research and Training (NCERT)
Board:	Central Board of Secondary Education (CBSE)
Class:	8th
Subject:	Maths
Chapter:	9 Part-3
Chapters Name:	Algebraic Expressions and Identities
Medium:	English

Ncert Solutions for Class 8 Maths | Objective Type Questions

You can refer to NCERT Solutions for Class 8 Maths Chapter 9 Algebraic Expressions and Identities to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Algebraic Expressions and Identities | Class 8 Maths | NCERT Solutions

Q1.	Mcq Questions for Class 8 Maths with answers pdf Chapter 9 The product of 7x and -12x is
	A. 84x²
	B. -84x²
	C. x²
	D. -x².

Ans: -84x²
Hint:
(7x) (-12x) = – 84x².

Q2.	Mcq Questions for Class 8 Maths with answers pdf download The area of a rectangle whose length and breadth are 9y and 4y² respectively is
	A. 4y³
	B. 9y³
	C. 36y³
	D. 13y³

Ans: 36y³
Hint:
Area = (9y)(4y²) = 36y³.

Q3.	Ncert Class 8 Maths Mcq Chapter 9 The area of a rectangle with length 2l²m and breadth 3lm² is
	A. 6l³m³
	B. l³m³
	C. 2l³m³
	D. 4l³m³.

Ans: 6l³m³
Hint:
Area = (2l²m)(3lm²) = 6l³m³.

Q4.	Ncert Class 8 Maths Mcq Questions The volume of a cube of side 2a is
	A. 4a²
	B. 2a
	C. 8a³
	D. 8.

Ans: 8a³
Hint:
Volume = 2a × 2a × 2a = 8a³.

Q5.	CBSE Class 8 Maths Chapter 9 Mcq The volume of a cuboid of dimensions a, b, c is
	A. abc
	B. a²b²c²
	C. a³b³c³
	D. none of these.

Ans: abc
Hint:
Volume = a × b × c = abc.

Q6.	CBSE Class 8 Maths Chapter 9 Mcq Questions The product of x², – x³, – x⁴ is
	A. x⁹
	B. x⁵
	C. x⁷
	D. x⁶

Ans: x⁹
Hint:
Product = (x²) (-x³)(-x⁴) = x⁹.

Q7.	CBSE Class 8 Maths Algebraic Expressions and Identities Mcq (x – y)(x + y) + (y – z)(y + z) + (z – x) (z + x) is equal to
	A. 0
	B. x² + y² + z²
	C. xy + yz + zx
	D. x + y + z.

Ans: 0
Hint:
(x – y)(x + y) + (y – z)(y + z) + (z – x) (z + x) = x² – y² + y² – z² + z² – x² = 0.

Q8.	CBSE Class 8 Maths Mcq Questions (a + b)² is equal to
	A. a² + b² – 2ab
	B. a² + b² + 2ab
	C. a² + b²
	D. 2ab.

Ans: a² + b² + 2ab
Hint:
(a + b)² = a² + b² + 2 ab.

Q9.	CBSE Class 8 Maths Algebraic Expressions and Identities Mcq Questions (a – b)² is equal to
	A. a² + b² – 2ab
	B. a² + b² + 2ab
	C. a² + b²
	D. 2ab.

Ans: a² + b² – 2ab
Hint:
(a – b)² = a² + b² – 2ab.

Q10.	Class 8 Maths Mcq Chapter 9 a² – b² is equal to
	A. 2ab
	B. -2ab
	C. (a + b) (a – b)
	D. ab

Ans: (a + b) (a – b)
Hint:
a² – b² = (a + b) (a – b).

Q11.	Class 8 Maths Mcq online test An algebraic expression that contains only one term is called:
	A. Monomial
	B. Binomial
	C. Trinomial
	D. None of the above

Ans: Monomial
Hint:
2x is a monomial

Q12.	Class 8 Maths Mcq with answers 5x + 6y is a:
	A. A. Monomial
	B. Binomial
	C. Trinomial
	D. None of the above

Ans: Binomial
Hint:
The expression containing two terms is called binomial.

Q13.	Learn Cbse Class 8 Maths Mcq The algebraic expression 3x + 2y + 6 is
	A. monomial
	B. Binomial
	C. Trinomial
	D. None of the above

Ans: Trinomial
Hint:
The algebraic expression containing three terms is called a trinomial. Here, 3x, 2y and 6 are three terms.

Q14.	Mcq Class 8 Maths Chapter 9 A polynomial contains _______ number of terms:
	A. One
	B. Two
	C. Three
	D. Any

Ans: Any
Hint:
A polynomial can contain any number of terms, one or more than one.

Q15.	Mcq for Class 8 Maths Chapter 9 If we add, 7xy + 5yz – 3zx, 4yz + 9zx – 4y and -3xz + 5x – 2xy, then the answer is:
	A. 5xy + 9yz + 3zx + 5x – 4y
	B. 5xy – 9yz + 3zx – 5x – 4y
	C. 5xy + 10yz + 3zx + 15x – 4y
	D. 5xy + 10yz + 3zx + 5x – 6y

Ans: 5xy + 9yz + 3zx + 5x – 4y
Hint:
Given, 7xy + 5yz – 3zx, 4yz + 9zx – 4y and -3xz + 5x – 2xy.
If we add the three expressions, then we need to combine the like terms together.
(7xy – 2xy)+(5yz + 4yz) – 3zx + 9zx – 3xz – 4y + 5x
5y + 9yz + 3zx + 5x – 4y

Q16.	Mcq Questions for Class 8 Maths with answers pdf Chapter 9 If we subtract 4a – 7ab + 3b + 12 from 12a – 9ab + 5b – 3, then the answer is:
	A. 8a + 2ab + 2b + 15
	B. 8a + 2ab + 2b – 15
	C. 8a – 2ab + 2b – 15
	D. 8a – 2ab – 2b – 15

Ans: 8a – 2ab + 2b – 15
Hint:
(12a – 9ab + 5b – 3) – (4a – 7ab + 3b + 12)
= 12a – 9ab + 5b – 3 – 4a + 7ab – 3b – 12
= (12 – 4)a – (9 – 7)ab + (5 – 3)b – 3 – 12
= 8a – 2ab + 2b – 15

Q17.	Mcq Questions for Class 8 Maths with answers pdf download If we multiply 5x and (-4xyz), then we get:
	A. 20x²yz
	B. -20x²yz
	C. x²yz
	D. -2xyz

Ans: -20x²yz
Hint:
(5x) x (-4xyz)
= 5 × x × (-4) × x × y × z
= -20x¹⁺¹yz
= -20x²yz

Q18.	Ncert Class 8 Maths Mcq Chapter 9 The product of 4x and 0 is:
	A. 4x
	B. 4
	C. 0
	D. None of the above

Ans: 0
Hint:
Anything multiplied by zero is zero.

Q19.	Ncert Class 8 Maths Mcq Questions The volume of a rectangle with length, breadth and height as 5x, 3x² and 7x⁴ respectively is:
	A. 105x⁷
	B. 105x²
	C. 105x⁴
	D. 105x

Ans: 105x⁷
Hint:
Volume of rectangle = Length × breadth × height
V = 5x × 3x² × 7x⁴
V = 105 x¹⁺²⁺⁴
V = 105x⁷ cubic unit.

Q20.	CBSE Class 8 Maths Chapter 9 Mcq In which of the following, the two expressions are like terms ?
	A. 7x and 7y
	B. 7x and 9x
	C. 7x and 7x²
	D. 7x and 7xy