Q. 4

In a cylinder, ra A. halved

B. doubled

C. same

D. four times

Answer :

Let the radius of a cylinder be r unit and height be h unit. Now according to question,


Radius is doubled that is 2r and height is halved that is


Now curved surface area of a cylinder is


And according to the above condition, curved surface area



This is same as the curved surface area of the cylinder with radius r and height h.


Thus option c is correct.

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