The number of solid spheres each of diameter 6 cm, that could be moulded to form a solid metal cylinder of height 45 cm and diameter 4 cm is?

If the volume and surface area of a sphere is numerically the same then it’s radius is_________?

A. 1 unit

B. 2 units

C. 3 units

D. 4 units

A right cylinder and a right circular cone have the same radius and the same volume. The ratio of the height of the cylinder to that of the cone is_________?

A. 3: 5

B. 2: 5

C. 3: 1

D. 1: 3

The radius of a circular cylinder is the same as that of a sphere. Their volumes are equal. The height of the cylinder is________?

A. 4/3 times its radius

B. 2/3 times its radius

C. Equal to it’s radius

D. Equal to it’s diameter

The length of the wire of 0.2mm radius that can be drawn after melting a solid copper sphere of diameter 18cm?

A. 24.3 m

B. 243 m

C. 2430 m

D. 24300 m

The radius of a wire is decreased to one –third if volume remains the same length will increase

A. 1 Time

B. 3 times

C. 6 times

D. 9 times