Class 8 Science – Microorganisms: Friend and Foe 1. Introduction Microorganisms (microbes) are tiny living organisms not visible to the eye. Found everywhere: air, water, soil, humans,...
Question: In a cyclic quadrilateral ABCD, AB = 4, BC= 5, CD = 9 and DA = 5. Find the length of the diagonal AC. (1) 8 (2) 7 (3) 6 (4) √61. Solution: AC*BD = 36+25 = 61 AC/BD = 20+45/...
Class 8 Science – Combustion and Flame 1. Introduction Combustion is the process in which a substance reacts with oxygen to release heat and light. Most fuels undergo combustion to provide...
1. Introduction Rational numbers are numbers that can be expressed as the ratio of two integers, where the denominator is not zero. Examples: numbers like 1/2, -3/4, 5, 0. 2. Properties...