ATDH Perceptual Ability: Paper Folding (Hole Punching)

Question 1

A square sheet of paper is folded in half once, and one hole is punched through all layers. How many holes appear when the paper is unfolded?

Accepted Answer

2

Answer

The punch goes through 2 layers, so it makes 2 holes. They sit as mirror images of each other across the fold line.

Question 2

A square sheet is folded in half, then folded in half again, and one hole is punched through all layers. How many holes appear when it is fully unfolded?

Accepted Answer

4

Answer

Each fold doubles the number of layers: 1 becomes 2, then 4. A single punch through 4 layers makes 4 holes.

Question 3

A square sheet is marked with a 4×4 grid. Columns are numbered 1–4 from left to right and rows 1–4 from top to bottom. The left half is folded over onto the right half, so the fold line falls between columns 2 and 3. A hole is punched at row 1, column 3. Where are the holes after unfolding?

Accepted Answer

Row 1, columns 2 and 3

Answer

Unfolding mirrors the hole across the fold line between columns 2 and 3. Column 3 maps to column 2, and the row stays the same. The holes are at row 1, columns 2 and 3.

Question 4

Using the same 4×4 grid (rows 1–4 top to bottom), the top half is folded down onto the bottom half, so the fold line falls between rows 2 and 3. A hole is punched at row 4, column 1. Where are the holes after unfolding?

Accepted Answer

Row 1 and row 4, column 1

Answer

Reflecting across the fold between rows 2 and 3 maps row 4 to row 1 and keeps the column the same. The holes are at row 1, column 1 and row 4, column 1.

Question 5

A 4×4 grid sheet (rows top to bottom, columns left to right) is folded along the diagonal from the top-left corner to the bottom-right corner. The bottom-left triangle is laid onto the top-right triangle. A hole is punched at row 1, column 3. Where are the holes after unfolding?

Accepted Answer

Row 1, column 3 and row 3, column 1

Answer

Reflecting across the top-left to bottom-right diagonal swaps the row and column numbers. Row 1, column 3 becomes row 3, column 1.

ATDH - Admission Test for Dental Hygiene Practice Test

ATDH - Admission Test for Dental Hygiene Practice Test

ATDH Perceptual Ability: Paper Folding (Hole Punching)