Aperture / Keyhole Questions - DAT Perceptual Ability

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Question

A three-dimensional object is shown in the question prompt, and outlines of five apertures or openings are shown as the answer choices. First, you imagine how the object looks from all directions (rather than form a single direction as shown). Then, pick from the five apertures outlined the opening through which the object could pass directly if the proper side were inserted first.

Here are the rules:

1. Prior to passing through the aperture, the irregular solid object may be turned in any direction. It may be started through the aperture on a side not shown.

2. Once the object is started through the aperture, it may not be twisted or turned. It must pass completely through the opening. The opening is always the exact shape of the appropriate external outline of the object.

3. Both objects are drawn to the same scale. Thus, it is possible for an opening to be the correct shape but too small for the object; however, in all cases, differences are large enough to judge by eye.

4. There are no irregularities in any hidden portion of the object; however, if the figure has symmetric indentations, the hidden portion is symmetric with the part shown.

5. For each object there is only one correct answer.

Dat pat keyhole q1

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Answer

This is the correct keyhole/aperture shape:

Dat pat keyhole q1 a1

If the three-dimensional shape were positioned so that the front-most face were parallel with the keyhole, it would be able to fit through. Note how the triangular piece that juts up above the mostly-rectangular prism farthest away from the presented three-dimensional view would require the left sloped side of the triangular portion near the top of the keyhole, and the triangular piece sticking up from the front of the presented three-dimensional view would require the right sloped side of the triangle in the keyhole. The bottom right corner of the mostly-rectangular prism comes to a point, which is accommodated by a corresponding point in the keyhole. The right angle where the mostly-rectangular prism meets the left part of the shown three-dimensional shape is also represented in the keyhole.

Dat pat keyhole q1 a2Dat pat keyhole q1 a5

The shape showns above are not correct because neither shows the right angle where the rectangular prism with a pointed bottom-right corner meets the left part of the shape. In addition, the shape on the right does not provide space for the pointed corner near the bottom-right of the presented view.

Dat pat keyhole q1 a3

This shape is not correct because the two triangular pieces that jut above the mostly-rectangular prism are shown with a gap in between them. By looking at the presented three-dimensional shape, you can see that they do not have this large of a gap in between their spacing on the parallel sides of the rectangular prism.

Dat pat keyhole q1 a4

This shape is not correct because it does not include space for the pointed corner of the shape similar to a rectangular prism. This is its bottom-right corner in the presented view.

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