People use a variety of methods to wash clothes. Usually after adding the soap, they 'beat' the clothes on a stone, or beat it with a paddle, scrub with a brush or the mixture is agitated in a washing machine. Why is agitation necessary to get clean clothes?
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Why does the skin of your finger shrink when you wash clothes for a long time?
Soap solution is very concentrated - Hypertonic solution, so water moves out of your finger cells by osmosis.
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You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash.
Conditions that can increase the rate of evaporation of water are (a) an increase of surface area by spreading the shirt (b) an increase in temperature by putting the shirt under the...
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People use a variety of methods to wash clothes.
Agitation is necessary to get clean clothes because the soap micelles which entrap oily or greasy particles on the surface of dirty cloth have to be removed from its surface....
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People use a variety of methods to wash clothes. Usually after adding the soap, they 'beat' the clothes on a stone, or beat it with a paddle,
Agitation is necessary to get clean clothes because the soap micelles which entrap oily or greasy particles on the surface of dirty cloth have to be removed from its surface. When...
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Which of the following materials did people use in ancient times for making clothes?
(i) Leaves of trees (iv) Animal skins and furs
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Why do wet clothes placed on a clothes line get dry after some time? Explain.
Water present in wet clothes is converted into water vapour due to evaporation and leaves them dry.
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A soap solution appears cloudy because (A) soap micelles absorb light (B) soap micelles precipitate out
(D) soap micelles scatter light
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A stone is released from an elevator going up with an acceleration a. The acceleration of the stone after the release is
(d) g downward Explanation: Gravity is the only force acting on the stone when it is released. And, we know that gravity is always in the downward direction.
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Find out more about men and women who renounce the world today. where do the live, what kinds of clothes do they wear, what do they eat?
Mother Teresa was one such lady who gave up worldly pleasures and decided to serve humanity. She had become a nun at very early age. The sufferings of the people,...
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Talk with your grandparents or elderly people and find out what they ate and what work they did when they were
My grandparents were working much more than what we do today. They used to go to school miles away from their home. They were also doing much physical work like...
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