Please select a subject first
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Assertion: People struck by lightning receive a severe electrical shock.
Reason: Lightning carries very high voltage.
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The property of _______ of a liquid surface enables the water droplets to move upward in plants.
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Numerical Problem.
A stone weighs 500 N. Calculate the pressure exerted by it if it makes contact with a surface of area 25 cm2.
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How does the friction arise between the surfaces of two bodies in relative motion?
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How does surface tension help a plant?
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Describe an experiment to prove that friction depends on the nature of a surface.
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In a thermos flask, the silvered walls reflect and radiate the heat outside.
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Define valency of an element with respect to hydrogen.
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Permanent hardness of water is due to the presence of _______.
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Temporary hardness of water can be removed by ________ of water.
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What are the methods of removing hardness of water?
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What is permanent hardness of water? How can it be removed?
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Distinguish between octane number and cetane number.
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Common cold in human is caused by ______.
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Chicken pox is a communicable disease.
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Citrus canker is transmitted by insects.
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