Tag Archives: NCERT Books Online Solutions

Question: State the observation made by Oersted on the basis of his experiment with current carrying conductors. Answer: Every current carrying conductor has a magnetic field around it. Question: State the direction of the magnetic field inside the bar magnet. Answer: From south to north pole. Question: Mention the special feature …

Question: Mention one reason why tungsten is used for making filament of electric lamp. Answer: It has low resistivity and high melting point. Question: Calculate the number of electrons constituting one coulomb of change. (Charge one electron = 1.6 × 10-19C) Answer: Number of electron = 1C/1.6 × 10-19C = 0.625 × 1019 = 6.25 × 10-18 …

Question: What is Hydrotropism? Answer: Hydrotropism is a type of tropism, where the plant shows movement in response to water. Question: What is coordination? Answer: The organ system cannot work independently. They are linked in one way or the other. Working together of all these systems is called coordination. Question: …

Question: Name the components of blood which transport: Food, carbon dioxide and nitrogenous wastes Oxygen Answer: (1) Plasma, (2) Hemoglobin Question: When we breathe out, why does the air passage not collapse? Answer: Because it is supported by cartilaginous rings which prevent its collapsing. Question: Name the process of loss …

Question: What is meant by p and pH? Answer: p in pH stands for ‘potenz’ in Germany and H is for hydrogen. Question: What are antacids? Explain their role in providing relief from stomach ache. Answer: Antacids are mild base. Antacids neutralise the effect of extra acid produced in the …

Question: Give composition of the alloy – ‘brass’ and ‘bronze’. Answer: Brass – Cu and Zn Bronze – Cu and Tin Question: What is the formula of rust? Answer: Fe2O3.xH2O. Question: An alloy has low melting point and is, therefore, used for electrical fuse. Name they alloy and write its …

Question: What is proto-industrialization? Answer: The parlyol phase  industrialization in which large-scale production was carried out for international market not at factories but in decentralized units. Question: How was proto-industrialization different from factory production? Answer: Proto-industrialization was a decentralized method of production which was controlled by merchants and the goods …

Chemical Reaction & Equations: 10 Science – Chapter 1 Question: What is a balanced chemical equation? Why should chemical equations be balanced? Answer: An equation for a chemical reaction is an equation in which the number of atoms for each element in the reaction and the total charge is the same …

Question: Who wrote the novel ‘Debganer Martye Aagaman’? Answer: Durgacharan Ray Question: What was the theme of the novel ‘Debganer Martye Aagaman’? Answer: The basic aim of the novel was to explain the city life of Calcutta. Question: What is urbanization? Answer: Development of cities and towns is known as …

Question: Name the countries where the earliest kind of print technology was developed. Answer: (i) China (ii) Japan (iii) Korea Question: What is calligraphy? Answer: The art of beautiful and stylish writing is known as calligraphy. Question: Who was the major producer of printed material in China? For what purpose …