a2zinterviews

7.	How many cubes of 3 cm edge can be cut of a cube of 18 cm edge?
	A.  36
	B.  216
	C.  218
	D.  432

Solution

Number of cubes = (18×18×18 / 3×3×3) ‹=› 216.

8.	A hall is 15 m long and 12 m broad. If the sum of the areas of the floor and the ceiling is equal to the sum of the areas of four walls, the volume of the hall is:
	A.  720
	B.  900
	C.  1200
	D.  1800

Solution

2(15 + 12) ×h = 2(15 x 12) ‹=›h= 180/27 m = 20/3m Volume = (15×12×20/3)m3 ‹=›1200 m3.

9.	A circular well with a diameter of 2 metres , is dug to a depth of 14 metres. What is the volume of the earth dug out?
	A.  32 m3
	B.  36 m3
	C.  40 m3
	D.  44 m3

Solution

Volume = πr2h ‹=› (22 /7 ×1×1×14)m3 ‹=›44 m3.