Question: Graphic represent the nature of the distance-time graph of motion of the given object – Answer: (1) An athlete running at a constant speed. (2) A train waiting at a station for another train pass by. Question: Differentiate between periodic and non periodic motion. Answer: Differentiate between periodic and non periodic …
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Question: What is waste water? How it is produced? Schematically represent the process of waste water treatment. Answer: The used water that comes into drains from bathroom, toilets and kitchen. The process is: The waste water sewage reaches through domestic sewerage’s. Bar screens are used to remove large substances like cans …
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Question: Explain how soil is formed. Answer: Soil is formed through the process of weathering. Weathering is a process of physical breakdown and chemical decomposition of rocks and minerals near or at the surface of the earth. This physical and chemical decomposition is primarily done by wind, water, and climate. As …
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Question: Why is transport of materials necessary in a plant or an animal? Explain. Answer: Transport of materials is necessary for plants or animals because due to it the nutrients and oxygen are made available to all the parts of the body. If the transport of necessary nutrients and oxygen does …
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Question: What do you mean by ‘stomata’ apparatus? Answer: Stomata apparatus means stomata along with nearby guard cells and other cells. Question: What are the main organs of the respiratory system? Answer: Main organs that help in respiration are : Nostrils (The passages in the nose) Trachea (Windpipe) Bronchi Lungs Question: …
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Question: Why does heated air rise up? Answer: The air get heated the molecules expand and get away from each other and the air becomes less dense. Question: What causes lightning during a thunderstorm? Answer: The water droplets and ice crystals collide with each other due to the swift rising air. These …
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Question: What is an electric circuit? Answer: An electric Circuit is a continuous conducting path for electric current. Question: What is the relationship between potential difference and direction of flow of current in an electric circuit? Answer: If current flows from point A to point B in a wire, we …
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NCERT 7th Class (CBSE) Science: Weather, Climate and Adaptations of Animals to Climate Question: What does a meteorologist do? Answer: A meteorologist is a person who prepares the weather report by collecting information on temperature, wind, humidity, rainfall etc. and predicts the weather conditions of a particular place. Question: What …
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Question: Acids are not stored in metal containers. Why? Answer: Acids can corrode metals like aluminium and iron due to their corrosive nature. That is why acids are stored in glass containers and not in metal containers. Question: Why do different substances have different tastes? Answer: Different substances have different tastes …
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NCERT 7th Class (CBSE) Science: Acids, Bases and Salts – Quiz 31 Multiple Choice Questions related to NCERT 7th Class (CBSE) Science: Acids, Bases and Salts – Quiz: Acids: Substances that taste sour. Organic Acid: Acids that are naturally obtained from plant and animal sources. Mineral Acid: Acids that are derived from …
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Class Notes NCERT Solutions for CBSE Students