A. What do you understand by the term biotic substances? Give examples.
B. What do you understand by the term abiotic substances? Give examples.
What do you understand by the term relative density of a substance ?
(a) What do you understand by the " resistivity" of a substance (b) A wire is 1.0 m long, 0.2 mm in diameter and has a resistance of 10 Ω Calculate the resistivity of its material?