A right circular cylinder has radius 7 cm and height 10 cm. Another cylinder has twice the height and half the radius. The ratio of their volumes (first : second) is:

How many meters of cloth 6 metre wide will be required to make a conical tent, the radius of whose base is 21m and height is 20m?

Read the information given carefully and answer the question that follows:

(A) 72 kmph = 20 m/s

(B) 25 m/s = 80 kmph

(C) Total Surface area of a Cube of edge length $a$ is $6a^2$

(D) Volume of a Cube of edge length $a$ is $a^3$

Choose the correct answer from the options given below:

Which of the following statements are true?

(A) If the diagonal of a cube is $6\sqrt{3}$ cm, then its volume and surface area are equal.

(B) If a rectangular block having dimensions 6 cm x 12 cm x 15 cm is cut into an exact number of equal cubes, then the least possible number of such cubes is 27.

Choose the correct answer from the options given below:

The number of iron balls, each 1 cm in radius, that can be made from an iron sphere of diameter 12 cm is:

The area of four walls of a rectangular hall having length 18 m and height 8 m is 448 m$^2$. What is the breadth of the hall (in m)?

Consider the surface area of the following solids.

(A) A cube of edge 8 cm.

(B) A cylinder with a diameter of base 10 cm and height 42 cm.

(C) A hemisphere with 14 cm diameter.

(D) A sphere with a radius 21 cm.

Arrange the above in decreasing order.

Choose the correct answer from the options given below: