+91-8076753736 [email protected]

-->

Probability

Question

Wired Faculty App

Curved surface area of a right circular cylinder is 4.4 m2. If the radius of the base of the cylinder is 0.7 m, find its height.

Solution

Let the height of the right circular cylinder be h m.
r = 0.7 m
Curved surface area = 4.4 m²

rightwards double arrow space space space space space space space space space space space space space space space space space 2 πrh space equals space 4.4 rightwards double arrow space space space space space space space 2 cross times 22 over 7 cross times 0.7 cross times straight h equals 4.4 rightwards double arrow space space space space space space space 4.4 space straight h space equals space 4.4 rightwards double arrow space space space space space space space space space straight h space equals space 1 space straight m

Hence, the height of the right circular cylinder is 1 m.

Some More Questions From Probability Chapter

Parveen wanted to make a temporary shelter for her car, by making a box-like structure with tarpaulin that covers all the four sides and the top of the car (with the front face as a flap which can be rolled up). Assuming that the stitching margins are very small, and therefore negligible, how much tarpaulin would be required to make the shelter of height 2.5 m, with base dimensions 4 m × 3 m?

A table cover 4 m x 2 m is spread on a table. Find the cost of polishing the top of the table at र40 per square metre of 25 cm table cover is hanging all round the table.

A classroom is 7 m long, 6.5 m wide and 4 m high. It has one door 3 m x 1.4 m and three windows each measuring 2 m x 1 m. The interior wall is to be colour washed. Find the cost of colour washing at the rate of र 3.50 per m².

Two cubes of side 6 cm each, are joined end to end. Find the surface area of the resulting cuboid.

The dimensions of a rectangular box are in the ratio of 2 : 3 : 4 and the difference between the cost of covering it with sheet of paper at the rates of र 8 and र 9.50 per m² is र1248. Find the dimensions of the box.

The length, breadth and height of a cuboid are 15 cm, 10 cm and 20 cm. Find the surface area of the cuboid.

Mary wants to decorate her Christmas tree. She wants to place the tree on a wooden block covered with coloured paper with picture of Santa Claus on it (see figure). She must know the exact quantity of paper to buy for this purpose. If the box has length, breadth and height as 80 cm, 40 cm and 20 cm respectively how many square sheets of paper of side 40 cm would she require?

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation