Directions : The problem figure shows the top view of an object. Identify the correct elevation, from amongst the answer figures, looking in the direction of arrow.
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Three concentric circles show a solid of revolution: a wide slab, a middle-sized solid and a smaller top part. A cone or cylinder of revolution never shows a central line in elevation.
The plan shows three concentric circles with diameters in the ratio of about 285 : 180 : 125. The object is therefore a solid of revolution made of a wide circular slab at the bottom, an inverted cone whose top circle has the middle diameter (its apex touches the slab, so no extra circle appears below it) and a small cylinder standing on the cone. The elevation shows a wide rectangle for the slab, an inverted triangle on it with its apex resting on the slab, and a narrower rectangle on top of the triangle, whose width equals the smallest circle. Figure (2) wrongly draws a central line inside the cone; a cone of revolution has no such edge. Figure (3) shows an upright triangle, and figure (4) a cylinder with an upright cone. Figure (1) matches. Answer: (1) the first figure
