Lakhmir Singh Class 9 CBSE Chemistry Text Book PAGE No 128 Solution 01 International Union of Pure and Applied Chemistry Solution 02 (a) Law of conservation of mass – Antonie Lavoisier (b) Law of constant proportions – Joseph Proust Solution 03 (a) Law of conservation of mass. (b) Law of constant proportions. Lakhmir Singh Class 9 CBSE Chemistry Text

Lakhmir Singh Chemistry Text Book Page No – 56 Solution 01 False Solution 02 Milk, Paint, Glass Solution 03 Air is a mixture. Solution 04 Mercury is a liquid metal and bromine is a liquid non-metal. Solution 05 Sodium metal is soft and diamond is an extremely hard non-metal. Solution 06 Diamond is a non-metal which is good conductor of electricity. Solution 07 Mercury Solution

CBSE Class 9 – Chemistry Page No:17 Solution 1 The condition for something to be called matter is that it should occupy space and have mass. Solution 2 Diffusion and Brownian motion. Solution 3 Diffusion. Solution 4 The characteristic of matter illustrated by this observation is that the particles of matter have spaces between them. Solution 5 This displays that each

Page 145 Solution 1 Mass = m Height above the ground = h Work done = Potential energy acquired by the body = m x g x h where g is acceleration due to gravity Solution 2 SI unit of work is Joule (J). Solution 3 Work is a scalar quantity. Work, as a physical quantity, requires only magnitude to

Lakhmir Singh Physics Class 9 Solutions Page No:100 Question 1: What is the value of gravitational constant G (i) on the earth, and (ii) on the moon ? Solution : Value of gravitational constant G on the earth and the moon is = 6.67 x 10-11 Nm2/kg2 Note that the value of G always remains constant irrespective

Lakhmir Singh Physics Class 9 Solutions Page No:55 Question 1: What name is given to the product of mass and velocity of a body ? Solution : The product of mass and velocity of a body is called momentum. Question 2: Name the physical quantity which is considered to be a measure of the quantity of motion

Lakhmir Singh Physics Class 9 Solutions Page No:19 Question 1: Is displacement a scalar quantity ? Solution : No, displacement is a vector quantity. Question 2: State whether distance is a scalar or a vector quantity. Solution : Distance is a scalar quantity. Question 3: Change the speed of 6 m/s into km/h. Solution : 6 m/s = 6 x (3600/1000) km/hr = 21.6km/hr Question

Chapter 1 - Life Processes Chapter 2 - Control and Coordination Chapter 3 - How do Organisms Reproduce? Chapter 4 - Heredity and Evolution Chapter 5 - Our Environment Chapter 6 - Management Of Natural Resources

Chapter 1 - Electricity Chapter 2 - Magnetic Effects of Electric Current Chapter 3 - Sources of Energy Chapter 4 - Reflection of Light Chapter 5 - Refraction of Light Chapter 6 - The Human Eyes And The Colorful World

Chapter 1 - Chemical Reactions and Equations Chapter 2 - Acids, Bases and Salts Chapter 3 - Metals and Non-metals Chapter 4 - Carbon And Its Compounds Chapter 5 - Periodic Classification Of Elements