Page 3 - CL-8 -CH-6 (CBQ)

Ans. Option (d) is correct

12 Assertion (A): The smallest number by which the number 72 must be multiplied to
obtain a perfect cube is 3.
Reason (R): The perfect cube is the result of multiplying the same integer three times.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Ans. Option (a) is correct.

13 (CASE STUDY QUESTION)

Mohan has to prepare a physics project in form of a cubical box for a social work
campaign but he had a cuboidal box of sides 4 cm, 2 cm, 4 cm. Now he has to change it in
the form of cube so that he can complete his project. For this, he needed more cuboids
so that he can make his project in form of cube.

Q.1. What is the volume of the cuboidal box?
3
(a) 21 cm
3
(b) 32 cm
3
(c) 23 cm
3
(d) 42 cm

Ans. Option (b) is correct.

2. In which form of the group should be the side of cube?
(a) Triples
(b) Squares
(c) Singles
(d) none of these

Ans. Option (a) is correct.

3.How many cuboids are more needed?
(a) 20
(b) 10
(c) 16
(d) 25

Ans. Option (c) is correct.

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