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Day: February 2, 2022
Why does our palm feel cold when we put some acetone or petrol or perfume on it?
Class 9
Chemistry
02/02/2022
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How does the water kept in an earthen pot (matka) become cool during summer?
Class 9
Chemistry
02/02/2022
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Why does a desert cooler cool better on a hot dry day?
Class 9
Chemistry
02/02/2022
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Suggest a method to liquefy atmospheric gases.
Class 9
Chemistry
02/02/2022
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For any substance, why does the temperature remain constant during the change of state?
Class 9
Chemistry
02/02/2022
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What is the physical state of water at: a. 250ºC b. 100ºC ?
Class 9
Chemistry
02/02/2022
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Convert the following temperature to celsius scale: a. 300 K b. 573 K.
Class 9
Chemistry
02/02/2022
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A bus starting from rest moves with a uniform acceleration of 0.1 m/s² for 2 minutes. Find (a) the speed acquired (b) the distance traveled
Class 9
Physics
Motion
02/02/2022
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Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why.
Class 9
Chemistry
02/02/2022
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Question: What is the quantity which is measured by the area occupied below the velocity-time graph?
Class 9
Physics
Motion
02/02/2022
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Give reasons (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid. (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
Class 9
Chemistry
02/02/2022
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What can you say about the motion of an object if its speed-time graph is a straight line parallel to the time axis?
Class 9
Physics
Motion
02/02/2022
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