Question:
A paper strip is rolled and punched by a triangular punch. After unrolling, what pattern of holes would appear on the strip?
A paper strip is rolled and punched by a triangular punch. After unrolling, what pattern of holes would appear on the strip?
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When a coiled strip is punched, unrolling produces a linear repetition of the punched shape, identical in orientation and equally spaced.
Updated On: Jan 7, 2026
- A
- B
- C
- D
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The Correct Option is C
Solution and Explanation
Step 1: Understand the punching process.
The strip is rolled into a cylinder. When a triangular punch is pressed through the side of the roll, it penetrates all the layers of the spiral.
Step 2: Effect of unrolling.
After unrolling, each punched layer leaves a hole at regular intervals along the length of the strip. Since the strip was coiled evenly, the punched triangles appear repeated periodically down the length.
Step 3: Orientation of triangles.
All triangular holes will face the same direction, because the punch orientation does not change as it pierces through.
Step 4: Compare with options.
- (A): Shows alternating orientations—incorrect.
- (B): Shows varying sizes/orientations—incorrect.
- (C): Shows evenly spaced identical triangles, matching the rolled punching process.
- (D): Shows misaligned orientation—incorrect.
Final Answer: \[ \boxed{\text{C}} \]
The strip is rolled into a cylinder. When a triangular punch is pressed through the side of the roll, it penetrates all the layers of the spiral.
Step 2: Effect of unrolling.
After unrolling, each punched layer leaves a hole at regular intervals along the length of the strip. Since the strip was coiled evenly, the punched triangles appear repeated periodically down the length.
Step 3: Orientation of triangles.
All triangular holes will face the same direction, because the punch orientation does not change as it pierces through.
Step 4: Compare with options.
- (A): Shows alternating orientations—incorrect.
- (B): Shows varying sizes/orientations—incorrect.
- (C): Shows evenly spaced identical triangles, matching the rolled punching process.
- (D): Shows misaligned orientation—incorrect.
Final Answer: \[ \boxed{\text{C}} \]
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