Tasneem should not use stretchable rubber to make a metre scale because it can change length when stretched, leading to inaccurate measurements.
Explanation:
Plywood, steel, and cloth (depending on the type):
These materials are generally rigid and maintain a consistent length, making them suitable for a metre scale.
Paper:
It is easily tearable, wrinklable, and can be damaged, leading to unreliable measurements.
Stretchable rubber:
Due to its elastic nature, it can change length when stretched, causing inaccuracies in measurements.
Key point: A metre scale needs to be stable and maintain a consistent length for accurate measurements. Stretchable rubber does not fulfill this requirement.