The problem figure shows the top view of an object. Identify the correct elevation amongst the answer figures looking in the direction of arrow.
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Project the plan upwards: the width of every part of the elevation equals its width in the top view, and every edge of the plan that runs front to back appears as a vertical line.
The arrow points up the page, so we look from the bottom of the plan and the elevation width equals the plan width (left to right). The outer rectangle is the wide, low base slab. The inner rectangle is a narrower raised block resting on it. The small central rectangle starts inside the inner rectangle, crosses the front line of the block (the front edge of the block is not drawn there) and runs out to the front edge of the slab. It is therefore a vertical cut or slot at the centre of the front, passing through the slab and the block. In the front view its two side edges are two vertical lines running from the top of the block down to the floor of the cut, and they interrupt the top line of the slab. Option 1 shows exactly this: base slab, block behind, and a central narrow rectangle running from the top of the block down below the slab top line. Option 2 shows only a shallow notch in the slab (the lines do not rise through the block); option 3 shows a small block in front (the plan would then keep the front edge line of the block); option 4 shows no cut, only extra divisions. Answer: (1) answer figure 1
