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Q1. In a cylinder, if radius is doubled and height is halved, curved surface area will be 


(a) halved 


(b) doubled 


(c) same 


(d) four times 


Q2. Two cylindrical jars have their diameters in the ratio 3: 1, but height 1 : 3. Then the ratio of their volumes is 


Q3. The number of surfaces in right cylinder is 


Q4. Vertical cross- section of a right circular cylinder is always a 


Q5. If r is the radius and h is height of the cylinder the volume will be 


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