Q 1. Why does paper burn when kept on top of a candle flame whereas a paper cup containing water does not burn or catch fire?
Q 2. Why does a glass filled with water to the brim and covered by a piece of paper, cardboard or handkerchief does not spill water when overturned but a glass half filled with water empties and falls down when overturned?
Q 3.Why are load stones attached to the railway electric lines?
Q 4. Why does a bird which sits on a live wire does not get electrocuted?
Q 5. Why does the water in an earthen pot cooler than the water in a metal pot?
Ans 1. When the paper cup is filled with water, the water absorbs the heat from the candle flame and does not give paper the optimum temperature to burn or catch fire.
Ans 2. The pressure on both sides are equal.
Ans 3. When heat is given to a metal it expands and when the metal is cooled it contracts. Similarly during summers due to the heat of the sun the electric wires would expand and this might lead to short circuit. For the same reason load stone is attached to the wires to prevent chances of a possible short circuit.
Ans 4. The bird sitting on the wire does not get electrocuted because the circuit is not complete.
Ans 5. There are very small pores in the walls of the earthen pot and water fills these pores and absorb heat from the water inside the pot to evaporate. This does not happen in the metal pots because there are no pores.
Q 2. Why does a glass filled with water to the brim and covered by a piece of paper, cardboard or handkerchief does not spill water when overturned but a glass half filled with water empties and falls down when overturned?
Q 3.Why are load stones attached to the railway electric lines?
Q 4. Why does a bird which sits on a live wire does not get electrocuted?
Q 5. Why does the water in an earthen pot cooler than the water in a metal pot?
Ans 1. When the paper cup is filled with water, the water absorbs the heat from the candle flame and does not give paper the optimum temperature to burn or catch fire.
Ans 2. The pressure on both sides are equal.
Ans 3. When heat is given to a metal it expands and when the metal is cooled it contracts. Similarly during summers due to the heat of the sun the electric wires would expand and this might lead to short circuit. For the same reason load stone is attached to the wires to prevent chances of a possible short circuit.
Ans 4. The bird sitting on the wire does not get electrocuted because the circuit is not complete.
Ans 5. There are very small pores in the walls of the earthen pot and water fills these pores and absorb heat from the water inside the pot to evaporate. This does not happen in the metal pots because there are no pores.
awesome work adithya!!!!!!!!!!!!!!!!!!!!
ReplyDeleteThanks Vishwesh Seshan
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