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E:\Working\Focus_Learning\Math_Genius-8\Open_Files\14_Unit Test_3\Unit Test_3
\ 03-Jan-2025 Bharat Arora Proof-3 Reader’s Sign _______________________ Date __________

Unit test – 3

A. Choose the correct option in Questions 1 to 10.

1. The sum of –8ab and 3ab is

(a) monomial (b) trinomial (c) binomial (d) None of these
2. Which of the following are like terms?

(a) 7xyz , –7xy z (b) –8xyz , 7xyz 2 (c) 7xyz , 7x yz (d) 7xyz , x y z .
2
2
2
2
2
2
2 2 2
3. The top view of a cuboid looks like a
(a) circle (b) square (c) rectangle (d) triangle
4. The number of faces of a pyramid with triangular base is
(a) 3 (b) 4 (c) 5 (d) 6
5. The area of a rhombus is 480 cm and one of the diagonals is 40 cm. Then the other diagonal
2
is

(a) 20 cm (b) 22 cm (c) 24 cm (d) 26 cm
6. The lateral surface area of a cube of side 12 cm is

(a) 144 cm 2 (b) 576 cm 2 (c) 864 cm 2 (d) 1728 cm 2
7. The height of a cylinder whose radius is 7 cm and lateral surface area is 1056 cm is
2
(a) 7 cm (b) 14 cm (c) 24 cm (d) 36 cm

8. If a polyhedron has 6 faces and 5 vertices, then its numbers of edges is

(a) 7 (b) 8 (c) 9 (d) 10
Directions (For Qs 9–10): 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 a correct explanation of

Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not a 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.

9. Assertion (A): (3x + 5y)(3x – 5y) = 9x – 25y .
2
2
Reason (R): (a + b) = a – b .
2
2
2
10. Assertion (A): The volume of a cuboid of length 5 cm, breadth 6 cm and height 8 cm is
240 cm .
3
Reason (R): The volume of cuboid is the product of length, width and height.

260