NIACL Model Paper 2 with solutions for free online practice

Question : 19 of 100

Marks: +1, -0

Three cubes of a metal are of edges 3 cm, 4 cm and 5 cm. These are melted together and from the melted material, another cube is formed. The edge of this cube is

8 cm
10 an
9 cm
6 an
None of these

Validate

Solution:

Let edge of the new cube = x cm.
Volume of the newly formed figure (cube)
= sum of volume of smaller cubes.
i.e.

(x)^3=(3)^3 +(4)^3+(5)^3 =27+ 64+125 = 216

=>x=6 cm

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