Q15 of 76 Page 18

If each edge of a cuboid of surface area S is doubled, then surface area of the new cuboid is

Given,


Let edges of cuboid = l , b , h


Surface area of cuboid =


New edges of cuboid = 2l , 2b , 2h


New surface area of cuboid =


= 4S

More from this chapter

All 76 →
13

If the areas of the adjacent faces of a rectangular block are in the ratio 2 : 3 : 4 and its volume is 9000 cm3, then the length of the shortest edge is

 14

If each edge of a cube, of volume V, is doubled, then the volume of the new cube is

 16

The area of the floor of a room is 15 m2. If its height is 4 m, then the volume of the air contained in the room is

 17

The cost of constructing a wall 8 m long, 4 m high and 20 cm thick at the rate of Rs. 25 per m3 is