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Q1. The number of surface of a cone has, is 

(a) 1 

(b) 2

(c) 3 

(d) 4

Q2. The area of the curved surface of a cone of radius 2r and slant height `l/2` , is 

Q3. The total surface area of a cone of radius `r/2`  and length 2l , is 

Q4. A solid cylinder is melted and cast into a cone of same radius. The heights of the cone and cylinder are in the ratio

Q5. The slant height of a cone is increased by 10%. If the radius remains the same, the curved sarface area is increased by 

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