Kerala 8th std Science Chapter 1 Measurement and Units Textbook Question and Answers

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Below are detailed answers to all questions and activities provided in the "Measurement and Units" chapter, including tables, calculations, and explanations. The responses are structured to address each task comprehensively, ensuring clarity for examination preparation.

Some sample questions are:

• What is a fundamental quantity?
  

Answer: A fundamental quantity is a physical quantity that exists independently and cannot be expressed in terms of other quantities. The seven fundamental quantities are length, mass, time, electric current, temperature, amount of substance, and luminous intensity. 

• Write a definition for derived quantities.
  

Answer: Derived quantities are physical quantities that can be expressed in terms of fundamental quantities through mathematical operations. For example, area (Length × Breadth) and density
(Mass ÷ Volume) are derived quantities. 

• What are the practical problems of using traditional units like foot, cubit, and hand span?
  

Answer: 
Low accuracy: Traditional units vary between individuals (e.g., one person’s cubit differs from another’s). 
Difficulty in analysis: Measurements using traditional units are hard for people in other regions to understand, leading to confusion in trade or construction. 

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