Question

A hard rubber roller is cut with a ‘V-shaped’ profile at three locations as shown in the Top View in the image on the left. The roller is then dipped in blue colour and rolled over a white plane. Which option shows the correct impression on the plane?

• A. Fig A
• B. Fig B
• C. Fig C
• D. Fig D

Hint:

Any flat, angled cut on a cylinder always produces a curved, sinusoidal edge when the cylinder is unrolled. Sharp straight-edged diamonds only occur if the rolled object itself is flat.

Answer 1

The Correct Option is B

Step 1: Unroll the roller.
The cylinder's surface flattens into a rectangle the length of its circumference.
Step 2: Map the V-cuts.
Each V-groove prints as a wave band, and three grooves give three bands matching one option.
\[ \boxed{\text{Option 2 (Fig B)}} \]