GATE 2023 IN – Question 10
An opaque cylinder (shown below) is suspended in the path of a parallel beam of light, such that its shadow is cast on a screen oriented perpendicular to the direction of the light beam. The cylinder can be reoriented in any direction within the light beam. Under these conditions, which one of the shadows P, Q, R, and S is NOT possible?
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Correct answer: (D) S
Explanation
An axial view gives a circle, a transverse view gives a rectangle, and an oblique view gives a rounded silhouette. A skew parallelogram with four sharp corners cannot be obtained: sharp end edges occur when the circular ends project to lines, which yields a rectangle.
Thus **S, D**.