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E:\Working\Focus_Learning\Math_Genius-8\Open_Files\11_Chapter_8\Chapter_8
\ 06-Jan-2025 Bharat Arora Proof-7 Reader’s Sign _______________________ Date __________

Chapter assessment

A. Choose the correct option:
1. Which of the following is a pair of like terms?

2
2
(a) 5xyz , –3xy z (b) –5xyz , 7xyz 2 (c) 5xyz , 5x yz (d) 5xyz , x y z
2
2
2 2 2
2
2
2. The coefficient in –56pqr is ............... .
(a) p (b) q (c) r (d) –56
3. Which of the following is a binomial?
3
3 2
2
2
(a) 5p q (b) 6p 95 (c) 2p q – 7q 3 (d) 4p + 7pq + 5
4. The sum of –8ab and 3ab is
(a) –11ab (b) 11ab (c) –5ab (d) 5ab
2 2
2 2
5. If we subtract –3x y from x y , then we get
2 2
2 2
2 2
(a) –4x y (b) –2x y (c) 2x y (d) 4x y
2 2
3
6. Product of the monomials 5a, –5b , and 9ab is
2 4
2 4
2 2
(a) 225a b (b) 225ab 4 (c) –225a b (d) 225a b
7. Square of 3x – 4y is
2
2
2
2
2
2
(a) 9x – 16y 2 (b) 6x – 8y 2 (c) 9x + 16y + 24xy (d) 9x + 16y – 24xy
8. Volume of a rectangular box with length 3x, breadth 4y and height 5z is ............... .
2 2 2
2 2 2
(a) 30xyz (b) 60xyz (c) 30x y z (d) 60x y z
B. Assertion and Reason Type Questions.
In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Choose the correct option.
(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion
(A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.
2 2
1. Assertion (A): The coefficient in the term –121x y is 121.
Reason (R): A coefficient is a number multiplied by a variable.
2
2
2 3 2
2. Assertion (A): When we divide –25x y z by 5xy , the quotient is 5xyz .
Reason (R): Division of one monomial by another is always a monomial.
3. Assertion (A): The value of the expression x(x + y ) if x = 1 and y = 2 is 9.
3
Reason (R): While multiplying a polynomial by a monomial, we multiply every term of polynomial
by the monomial.
2 2
2
2
4. Assertion (A): 3yz × (2y z + 3y z ) = 3yz × 2y z + 3yz × 3y z
2 2
2
2
2
Reason (R): Distributive property of multiplication over addition is a × (b + c) = a × b + a × c.
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