Question

The following are drawings of different stools. Indicate which one of them is most unstable for sitting. 

• A. A
• B. B
• C. C
• D. D

Hint:

For good stability, stool legs must transfer weight vertically; diagonal or zig-zag structures create tipping risk.

Answer 1

The Correct Option is D

Step 1: Observing the stool designs.
A stable stool must have legs positioned vertically under the seat or widely spread to distribute weight evenly. Any structure with angled legs or a zig-zag support drastically reduces stability.
Step 2: Why option D is unstable.
- (A) A: Simple vertical legs — stable.
- (B) B: Legs are angled outward, giving a wider base — stable.
- (C) C: Legs are vertical and evenly spaced — stable.
- (D) D: The support structure is a zig-zag, meaning the weight from above is not transferred vertically downward. The moment a person shifts or applies pressure, the stool will twist or topple. This design lacks vertical load-bearing support and is the most unstable.

Step 3: Conclusion.
Thus, the most unstable stool design is Option (D).