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1. Why does an athlete breathe faster and deeper than usual after finishing the race? Answer: An athlete breathes faster and deeper after finishing a race because their body needs more oxygen to produce extra energy. During the race, the muscles use more energy, and the oxygen supply to the muscles is less. Therefore, the … Read more
In-text Questions and Answers State the universal law of gravitation. Answer: The universal law of gravitation states that every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Write the formula to … Read more
In-Text Questions Answers 1. What is a tissue? A tissue is a group of similar cells that work together to perform a specific function in an organism. This organization allows the cells to be more efficient in carrying out tasks like movement, support, or transporting nutrients. 2. What is the utility of tissues in multi-cellular … Read more
Let’s Recall Match the following: ryot – peasant mahal – village nij – cultivation on planter’s own land ryoti – cultivation on ryot’s lands Fill in the blanks: (a) Growers of woad in Europe saw indigo as a crop which would provide competition to their earnings. (b) The demand for indigo increased in late eighteenth-century … Read more
Let’s Recall Fill in the blanks: (a) The British described the tribal people as wild and savages. (b) The method of sowing seeds in jhum cultivation is known as broadcasting. (c) The tribal chiefs got land titles in central India under the British land settlements. (d) Tribals went to work in the tea plantations of … Read more
1. Fill in the blanks. (a) Friction opposes the motion between the surfaces in contact with each other. (b) Friction depends on the nature of surfaces. (c) Friction produces heat. (d) Sprinkling of powder on the carrom board reduces friction. (e) Sliding friction is less than the static friction. 2. Four children were asked to … Read more
List two differences between the capitalist and socialist ideas of private property. Capitalist Idea: Private property is owned by individuals or businesses who are concerned with personal gain. They control the means of production, and profits are kept by the owners. Socialist Idea: Private property is controlled by society as a whole, meaning that the … Read more
1. Which of the following are matter? Answer: Chair, air, almonds, lemon water, smell of perfume are matter because they have mass and occupy space. Love, smell, hate, thought, cold are not considered matter because they do not have mass or occupy space. 2. Give reasons for the following observation: The smell of hot sizzling … Read more
1) What is meant by a substance? Answer: A substance is a form of matter that has a uniform and definite composition. It can be either an element or a compound, where all the constituent particles have the same chemical nature. 2) List the points of differences between homogeneous and heterogeneous mixtures. • Homogeneous Mixtures: … Read more
Activity 8.1: Understanding Inertia Objective: To demonstrate the concept of inertia and how it affects the motion of objects. Materials Needed: Carom coins, striker, table. Procedure: 1. Make a pile of similar carom coins on a table. 2. Attempt a sharp horizontal hit at the bottom of the pile using another carom coin or the … Read more