Maths : Volume and Surface Areas
1) If each edge of a cube is increased by 50%, find the percentage increase in Its surface area A) 125 % B) 150 % C) 112.5% D) 110 % Answer: A) 125% 2) How many cubes of 2cm edge can be cut out of a cube of 8cm edge A) 16 B) 9 C) 27 D) 64 Answer : D) 64 3) Find the length of the longest pole that can be placed in a room 12 m long 8m broad and 9m high. A) 14m B) 15m C) 16m D) 17m Answer: D) 17 m 4) How many bricks, each measuring 25 cm x 11.25 cm x 6 cm, will be needed to build a wall of 10 m x 6 m x 22.5 cm? A) 5600 B) 6000 C) 8000 D) 7200 Answer : C 5) A cuboid block 6 cm by 12 cm by 15 cm is cut up into an exact number of equal cubes. Find the least possible number of cubes. A) 30 B) 40 C) 10 D) 20 Answer: B) 40 Explanation: Volume of the block = (6 x 12 x 15) cm^3 = 1080 cm^3 Side of the largest cube = H.C.F. of 6 cm, 12 cm, 15 cm ...