If a solid of one shape is converted to another, then the surface area of the new solid

1. remains same

2. increases

3. decreases

4. can't say

The volume of the largest right circular cone that can be carved out from a cube of edge 4.2 cm is

1. 9.7 cm³

2. 77.6 cm³

3. 58.2 cm³

4. 19.4 cm³

The volumes of two spheres are in the ratio 64 : 27. The ratio of their surface areas is

1. 3 : 4

2. 4 : 3

3. 9 : 16

4. 16 : 9

If a cone, a hemisphere and a cylinder have equal bases and have same height, then the ratio of their volumes is

1. 1 : 3 : 2

2. 2 : 3 : 1

3. 2 : 1 : 3

4. 1 : 2 : 3