View Recognition / Top-Front-End Questions - DAT Perceptual Ability

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Question

The pictures that follow are top, front, and end views of solid objects. The views are without perspective. That is, the points in the viewed surface are viewed along parallel lines of vision. The projection looking DOWN on it is shown in the upper left-hand corner (TOP VIEW). The projection looking at the object from the FRONT is shown in the lower left-hand corner (FRONT VIEW). The projection looking at the object from the END is shown in the lower right-hand corner. (END VIEW). These views are ALWAYS in the same positions and are labeled accordingly.

Note that lines that cannot be seen on the surface in some particular view are DOTTED in that view.

In these problems, two views are shown, with four alternatives to complete the set. You are to select the correct one. It is not always the end view that must be selected; sometimes it is the top view or the front view that is missing.

Dat pat top front end q1

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Answer

To answer this question correctly, you need to understand the difference between solid lines and dashed lines on the DAT Perceptual Ability section. In this case, we're looking for the front view. The top view of this shape shows us that it is divided into three sections. Considering just this view, this could mean a variety of different things: the shape might be cube-like and each section might be a different step, for example, but we'd have no information about how the heights of each "step" would compare. In addition, the shape might not be a cube; angles might be involved. We can't tell solely from looking at the top view, though. The end view provides us with more information that allows us to narrow down our interpretation of the top view. Here, we see that the shape, when viewed from the end, involves an angle, and that there is a solid line at the bottom of the cube above the angular piece. This tells us that the cube is not connected to the shape that includes the angle. The cube's face isn't connected to the end face of the angled piece; it is separate. This tells us that the cube is farther away than the angled end face facing us directly in the end view. If one of its faces were connected to the angled end face, the diagram would not include a line separating the "cube" part of the shape from the angled part of the shape.

Now let's consider what the front of the shape has to look like. Notice that the "cube" part of the shape is on the left in all of the answer choices. This is important, as it tells us that we are looking at the flat, rectangular side of the larger part of the shape head-on, not at the angled sides. If we were looking at the angled sides, the "cube" part would have to be on the right side of the front-view diagram, and this isn't an option in any of the answer choices.

So, we know that the line forming the vertex of the angle shown in the End View diagram is behind the face of the shape we're directly looking at in the Front View. This tells us that this line must be dotted, not solid. Figuring this out allows us to ignore the following two answer choices because they use solid lines for their bottom-most shape-crossing line:

Dat pat top front end q1 a3Dat pat top front end q1 a4

This leaves us with two remaining answer choices, each of which correctly uses a dotted line:

Dat pat top front end q1 a1Dat pat top front end q1 a2

The only difference between these two answer choices is that the one on the left uses a dashed line to divide the "cube" shape from the rest of the shape, and the one on the right uses a solid line for this division. Which should it be? Consider how this "cube" shape will appear when we look at the shape head-on with the face shown as the bottom line of the Top View appearing first. Is the "cube" part of the shape in line with this face, or is it located further back in space? If the former is true, we need to use a dotter line to show that the cube shape does not continue for the entire volume of the shape, but that there is negative space located behind it. If the latter is true, we need to use a solid line to show that the negative space is in front of the cube. Looking at the Top View diagram, we can see that one face of the cube will be even with the face of the larger part of the shape at which we are looking in the Front View. This means that the negative space appears behind the cube, not in front of it, making the correct answer the shape that uses the dotted line:

Dat pat top front end q1 a1

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