Correct option is (C) Halved
\(R=\frac r2,\) H = 2h
Then \(V=\pi R^2H=\pi(\frac r2)^2\times2h\)
\(=\frac{\pi r^2h}2=\frac v2\) \((\because v=\pi r^2h)\)
Hence, if radius is halved and height is doubled in a cylinder then the volume of cylinder will be halved.
