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Table of contents Page No. 129 Q1. How does the sound produced by a vibrating object in a medium reach your ear?Ans: When the object vibrates, it […]

Table of contents Page No. 91 Q1. Which of the following has more inertia?(a) A rubber ball and a stone of the same size?(b) A bicycle and […]

Table of contents Page No. 102 Q1. State the universal law of gravitation.Ans: According to Newton’s universal law of gravitation, everybody in this universe attracts every other body with […]

Table of contents Page No. 74 Q1. An object has moved through a distance. Can it have zero displacements? If yes, support your answer with an […]

Table of contents Page No. 61 Q1. What is a tissue?Ans: A group of cells that are similar in structure and/or work together to achieve a particular […]

Table of contents Page No. 51 Q1. Who discovered cells and how?Ans: Q2. Why is the cell called the structural and functional unit of life?Ans: Page […]

Table of contents Page No. 15 Q1. What is meant by a substance?Ans: A pure substance is one that is made up of only one kind of […]

Table of contents Page No. 3 Q1. Which of the following are matter?Chair, air, love, smell, hate, almonds, thought, cold, lemon water, the smell of perfume.Ans: The […]