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  • Gravitation | Introduction and Universal Law of Gravitation | Class 9

    INTRODUCTION When a body is held is hand and then released the body falls vertically downwards. Let us think as to why the body falls towards the earth? Why is it not going up? It was Sir Issac Newton posed this question and himself answer it. It is said that when Newton was sitting under…

  • Test Paper (Heron’s Formula) – Class –IX

    Test Paper (Heron’s Formula) – Class –IX Maximum Marks: 25 1. The sides of a triangular plot are in the ratio of 3:5:7 and its perimeter is 300m. Find its area. (3 Marks) 2. Find the area of a quadrilateral ABCD in which AB = 3cm, BC = 4cm, CD = 4cm, DA = 5cm…