Question: Name the three processes in which oxygen is used. Answer: Combustion, respiration and in the formation of oxides of nitrogen. Question: Name two natural resources available on the earth. Answer: Water and air. Question: Give one example of biotic component of the biosphere. Answer: All animals, plants and micro …
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NCERT 9th Class (CBSE) Science: Structure of the Atom Quiz 17 Multiple Choice Questions related to NCERT 9th Class (CBSE) Science: Structure of the Atom Quiz Canal rays are positively charged radiations which led to the discovery of positively charged sub-atomic particle called proton. As per Rutherford’s model of an …
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Question: What is an election? State its relative mass and charge. Answer: The negatively charged particle found in the atoms of all elements is known as electron. The relative mass of an election is 1/1840 u & charge is – 1 (minus one). Question: What is the absolute mass & …
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Sound – 9th Class NCERT CBSE Science Chapter 12 Question: Can sound travel through: Carbon Water Answer: yes yes Question: Can sound travel through vacuum? Answer: No, sound cannot travel through vacuum. Question: Name the type of waves which are used by astronauts to communicate with one another on moon (or in …
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Question: Define law of conservation of mass. Answer: In a chemical reaction mass can neither be created nor destroyed. E.g., 2Na + Cl2 —–> 2NaCl 2 x 23 + 2 x 35.5 ——> 2(23 + 35.5) Question: Explain law of constant proportion. Answer: In a chemical substance the elements are always …
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Question: Does work done depend upon the velocity of the body. Answer: No. Question: State the law of conservation of energy. Answer: It states that energy can neither be created nor destroyed. It can only change its form. Question: In a tug-of-war one team gives way to the other. What …
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Class Notes NCERT Solutions for CBSE Students