A square sheet of paper is folded along the dotted line in the direction of the arrow, and holes are then punched through all the layers, as shown in the figures. How will the sheet look when it is opened out?
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) →
When a folded sheet is opened, every hole is repeated as its mirror image across each fold line, the last fold being opened first. Here the left half is folded over onto the right half, so opening it copies the hole across the vertical fold line. So the opened sheet has 2 holes, placed symmetrically about the fold line.
Option (1) — Incorrect. The holes have been copied across the horizontal fold line instead of the vertical fold line, so they are in the wrong places.
Option (2) — Incorrect. It shows only the holes as punched; their copies across the vertical fold line are missing.
Option (3) — Incorrect. It has an extra hole: the opened sheet has 2 holes, this option shows 3 holes.