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CBSE Class 10 Mathematics Solved Question Paper 2013

Long Answer Type

31.
A bucket open at the top, and made up of a metal sheet is in the form ofa frustum of a cone. The depth of the bucket is 24 cm and the diameters of its upper and lower circular ends are 30 cm and 10 cm respectively.Find the cost of metal sheet used in it at the rate of Rs 10 per 100 cm2.
$(Use π = 3.14)$

$Diameter of upper end of bucket = 30 cm ∴ Radius (r_{1}) of upper end of bucket = 15 cm Diameter of lower end of bucket = 10 cm ∴ Radius (r_{2}) of lower end of bucket = 5 cm Slant height (l) of frustum = \sqrt{(r_{1}} - r_{2})^{2} + h^{2} = \sqrt{(15 - 5)^{2}} + 24^{2} = \sqrt{10^{2} + 24^{2}} = \sqrt{100 + 576} = \sqrt{676} = 26 cm Area of metal sheet used to make the bucket = π (r_{1} + r_{2}) l + {πr}_{2}^{2} = π (15 + 5) x 26 + π 5^{2} = 520 π + 25 π = 545 π {cm}^{2} Cost of 100 {cm}^{2} metal sheet = Rs 10 Cost of 545 π {cm}^{2} metal sheet = Rs = \frac{545 x 3.14 x 10}{100} = Rs 171.13 Therefore, cost of metal sheet used to make the bucket is rs 171 . 13 .$

32.

In fig., l and m are two parallel tangents to a circle with centre O,touching the circle at A and B respectively. Another tangent at C intersects the line l at D and m at E. Prove that $∠$ DOE = 90⁰

33.

Prove that the tangent at any point of a circle is perpendicular to theradius through the point of contact.

34.

Two poles of equal heights are standing opposite each other on either sideof the roads, which is 80 m wide. From a point between them on theroad, the angles of elevation of the top of the poles are 60o and 30orespectively. Find the height of the poles and the distances of the pointfrom the poles.