12 spheres of the same size are made by melting a solid cylinder of 16cm diameter and 2cm height. Then, the diameter of each sphere is
√3cm
2cm
3cm
4cm
If height of a cone is tripled and radius is doubled then its volume will become ----- times.
12
8
4
2
A wooden article was made by scooping out a hemisphere from each end of a cylinder. If the height of the cylinder is 10cm and its base is of diameter 7cm, find the total surface area of the article when it is ready.
370 cm2
371 cm2
373 cm2
374 cm2
Three cubes of iron whose edges are 6cm, 8cm and 10cm are melted and formed into a single cube. Then the edge of the new cube is
18cm
14cm
12cm
16cm
If the radius of a sphere is half of the radius of another sphere, then their respective volumes are in the ratio
1 : 8
2 : 1
1 : 2
8 : 1
A cone of height 15cm and base diameter 30cm is curved onto a wooden sphere of radius 15cm. Then the percentage of wasted wood is
50%
75%
40%
25%
A spherical ball of lead 3 cm in diameter, is melted and recast into three spherical balls. The diameter of two of these balls are 1.5 cm and 2 cm respectively. Then, the diameter of the third ball is
3 cm
2.5 cm
2.6 cm
3.5 cm
The length of a cold storage is double its breadth. Its height is 3m. The areas of its four walls is 108m2. Find its volume.
18m3
72m3
216m3
36m3
The depth of a bucket is 42cm and the diameter if its top and bottom are 30cm and 10cm respectively. Then, the volume of the bucket is
14,400 cm3
14,100 cm3
14,200 cm3
14,300 cm3
If radius of a sphere is doubled then its volume becomes ---- times.
1
