Question

The front compound wall of a house is decorated by wooden spheres of diameter 21 cm, placed

on small cylindrical supports as shown in the following figure. Eight such spheres are used for

this purpose and are to be painted silver. Each support is a cylinder of radius 1.5 cm and height

7 cm and is to be painted black.

(4)

(a) Find the volume of each of the cylindrical support.

(i) 15.75 π cm3

(ii) 63 π cm3

(iii) 10.5 π cm3

(iv) 126 π cm3

(b) If silver paint costs 25 paise per cm2

, find the cost of painting 8 wooden spheres.

(i) `441 π

(ii) `110.25π

(iii) `882π

(iv) `1764π

(c) Which of the following is the formula to find curved surface area of a cylinder of radius r cm and

height h cm?

(i)

4rh

cm2

(ii)

2

2r h

cm2

(iii)

2 2   rh r 

cm2

(iv)

2rh

cm2​

Answer 1

Answer:

wow that is actually not understandable

Step-by-step explanation:

Answer 2

Answer:

The main political cause for the great revolt of 1857 was the policy of Doctrine of Lapse. It was an annexation policy purportedly used by Lord Dalhousie as per which any princely state or territory under the British East India Company would automatically be annexed if the ruler died without a male heir.