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 diameter of a garden roller is 1.4m and it is 2m long. How much area will it cover in 5 revolutions? (Take Π=22/7)
44 m2
40 m2
22 m2
14 m2
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
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
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
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
The diameter of a copper sphere is 6cm. The sphere is melted and is drawn into a long wire of uniform circular cross-section. If the length of the wire is 36cm, find its radius.
1cm
1.5cm
2cm
3cm
If height of a cone is tripled and radius is doubled then its volume will become ----- times.
12
8
4
2
Volume of hollow hemispherical shell of radii R and r is equal to
2/3πr3
4/3πR3
2/3π(R3-r3)
4/3π(R3-r3)
Spherical ball of diameter 21cm is melted and recasted into cubes, each of side 1cm. Find the numbers of cubes thus formed.
4800
5800
4851
5851
