Introduction We use water for our daily activities and make it dirty. Wastewater is the dirty water that goes down the drains from sinks, toilets, and laundries which is rich in lather, and mixed with oils. We can reuse this dirty water by removing pollutants from it. Demand for water is increasing day by day […]
Class 7 Chapter 18 Wastewater Story Read More »
Introduction Every object around us has different shapes, colours and uses. Whether food, clothes, chair, utensils, books, toys, water, stones, cycle any many more. All these objects can be grouped together on the basis of their properties such as appearance, shape, texture, features, characteristics etc.
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CLASS 8 CHAPTER 3- Synthetic Fibres and plastics Read More »
Introduction Amongst the three states of matter, liquid and gases are called fluids because of their ability to flow. But solid cannot flow. The reason for this is that the particles in a solid are not free to move in available space. There is a strong intermolecular force of attraction in between the particles in
CLASS 12 CHAPTER 1- Solid State Read More »
Introduction We already know that fibres are obtained either from animal sources or plant sources and are called natural fibres. Example: cotton and jute are obtained from plants. Silk and wool are obtained from animals. Wool Wool is obtained from animals bearing hair on their body such as sheep, yak, goats and some other animals.
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Introduction The clothes that we wear are made of different materials. Some clothes are soft, some are silky etc. The bedsheets, blankets, curtains, tablecloths, towels etc. all are made from different kinds of fabric. Also, we wear different types of clothes in different seasons. History of Clothing material In ancient times, people used the bark
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Question 1. Give an example of a metal which (i) is a liquid at room temperature. (ii) can be easily cut with a knife. (iii) is the best conductor of heat. (iv) is a poor conductor of heat. Answer Mercury Sodium Silver Mercury and Lead Question 2. Explain the meanings of malleable and ductile. Malleable
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Question 1 You have been provided with three test tubes. One of them contains distilled water and the other two contain an acidic solution and a basic solution, respectively. If you are given only red litmus paper, how will you identify the contents of each test tube? Answer: dip the red litmus paper in all
NCERT SOLUTIONS CLASS 10 CHAPTER 2 – Acids, Bases and Salts Read More »
Question 1. What is meant by a pure substance? Answer: A substance made up of single type of particles is known as a pure substance. Question 2. List the points of differences between homogeneous and heterogeneous mixtures. Answer: S. No. Homogeneous Heterogeneous 2 It has a uniform composition. Its composition is non-uniform. 3
NCERT SOLUTIONS CLASS 9 CHAPTER 2 – Nature of matter Read More »
Question 1: Convert the following temperatures to the Celsius scale. (a) 300 K (b) 573 K Answer: Using the formula: – T (°C) = T (K) – 273.15 300K = (300 – 273) = 27O C 573 K = (573 – 273) = 300O C Question 2: Convert the following temperatures to the Kelvin
NCERT SOLUTIONS CLASS 9 CHAPTER 1- Matters in our Surroundings Read More »
