Which among the following materials would you identify as soft materials and why? Ice, rubber band, leaf, eraser, pencil, pearl, a piece of wooden board, cooked rice, pulses and fresh chapati.
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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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You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
On heating the powder, it will char if it is a sugar. Alternatively, the powder may be dissolved in water and checked for its conduction of electricity. If it conducts,...
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Photosynthesis requires chlorophyll, and a few other raw materials. Add the missing raw materials to the list
(a) Sunlight/light energy, (b) carbondioxide.
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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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If you happen to go to a desert, what changes do you expect to observe in the urine you excrete? You would
(i) excrete small amount of urine. (iii) excrete concentrated urine.
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You have four beakers A, B, C and D. Out of A and B one has hard water and the other has soft water.
On adding soap solution, lather will be formed in the beaker containing soft water only. On adding detergent solution lather will be formed by both hard and soft water.
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Imagine you are a member of a fishing family and you are discussing whether to take a loan from the bank for an engine. What would you say?
If I were a member of fishing family, I would say we must take loan from the bank for an engine to improve the condition of our occupation because : (i) The...
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Electromagnets are made of soft iron because soft iron has (a) high retentivity and high coercive force
(d) low retentivity and low coercive force.
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When you split the whole answer, you will get masoor dal, but then you cannot sprout me! Can you think why?
It is because after splitting, the sprouting capacity of masoor is lost.
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Out of hard water and soft water which would you like to use for washing of clothes and why?
Soft water because it does not contain salts of calcium and magnesium (which form a precipitate with soaps) and hence give more froth with soap solution.
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