Units of length such as kilometre, metre, centimetre, and millimetre should begin with a lowercase letter, and their symbols (km, m, cm, mm) are also lowercase. They are never followed by ‘s’ for the plural. Chapter 5 Measurement of length ...
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A measuring tape is preferred because it is flexible and can easily wrap around the tree’s girth, while a metre scale is rigid and unsuitable for measuring curved or irregular shapes. NCERT Science Textbook Curiosity Science Session 2024-2025.
A 15-cm scale is appropriate for measuring the length of a pencil, as it provides the necessary precision for small lengths. Class 6 Science NCERT Chapter 5 Chapter 5 Measurement of length and motion