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In-Text Questions and Answers Question 1: A force of 7 N acts on an object. The displacement is 8 m in the direction of the force. What is the work done in this case? Answer: Work done is calculated by multiplying the force by the displacement in the direction of the force. So, Work done … Read more
Question 1: In a reaction, 5.3 g of sodium carbonate reacted with 6 g of acetic acid. The products were 2.2 g of carbon dioxide, 0.9 g of water, and 8.2 g of sodium acetate. Show that these observations are in agreement with the law of conservation of mass. Answer: Total mass of reactants: Mass … Read more
In-Text Questions and Answers What are canal rays? Answer: Canal rays are streams of positively charged particles discovered by E. Goldstein. They are also known as anode rays. These rays are produced in a gas discharge tube and move in a direction opposite to that of electrons. If an atom contains one electron and one … Read more
In-text Questions 1. Why 82°30’E has been selected as the Standard Meridian of India? India is a large country, with a time lag of two hours from the easternmost point to the westernmost point. To avoid confusion, 82°30’E longitude, which passes through Mirzapur in Uttar Pradesh, is chosen as the Standard Meridian of India because … Read more
1. Describe the circumstances leading to the outbreak of revolutionary protest in France. Answer:The French Revolution started because the common people were heavily taxed while the clergy and nobility enjoyed privileges. France’s debt from wars and the monarchy’s lavish spending worsened the economy, causing food shortages and high bread prices. The spread of ideas about … Read more
1. Choose the right answer from the four alternatives given below. (i) A landmass bounded by sea on three sides is referred to as: (a) Coast (b) Island (c) Peninsula (d) None of the above Answer: (c) Peninsula (ii) Mountain ranges in the eastern part of India forming its boundary with Myanmar are collectively called: … 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
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