Give one use of quaternary ammonium salts.
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If you could use any source of energy for heating your food, which one would you use and why?
We shall use LPG/CNG gas or electricity for heating our food because these are efficient ways of supplying energy. Thermal efficiency of the energy source is large, there is less...
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Why do we use averages? Are there any limitations to their use? Illustrate with your own examples related to development.
We use averages because they are useful for comparing differing quantities of the same category. For example, to compute the per capita income of a country, averages have to be...
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Which one of the following alkali metals gives hydrated salts? (a) Li (b) Na (c) K (d) Cs
Lithium,due to its small size .It is the one that gets easily hydrated.you can also say that lithium has the most polarising power due to which it attracts the water...
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Write the steps you would use for making tea. Use the words - solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
Take the solvent, water, in a kettle. Heat it. When the solvent boils, add the solute, milk. Milk and water forms a solution. Then pour some tea leaves over a...
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Write the steps you would use for making tea. Use the words - solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
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You are provided with a mixture containing sand, iron filings, ammonium chloride and sodium chloride.
Hint– Step-1 Separate iron filings with the help of a magnet Step-2 Sublimation of the remaining mixture separates ammonium chloride Step-3 Add water to the remaining mixture, stir and filter Step-4 The filtrate can...
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Give one important use of each of the following : (i) Equanil (ii) Morphine
[Hint : (i) Tranquilizer (antidepressant). (ii) Narcotic analgesics]
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If you could use any source of energy for heating your food, which one would you use and why?.
We would use a microwave oven for heating the food as it heats uniformly and clearly without any loss in its nutritional value.
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A shopkeeper wanted to fix a mirror which will give a maximum view of his shop. What type of mirror should he use? Give reason.
He will fix a convex mirror because it can form images of object spread over a large area.
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In the past 10 years use of which cooking fuel has increased in your area? Use of which fuel has decreased?
In the past 10 years use of electricity and LPG has increased while use of wood, upla, coal, etc. has decreased.
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