A Man Is Born Free but Binds in the Chains
Everyday Science Question Answers - Part 4 of 4
76. Question: Why is a new quilt warmer than an old one? Answer: In a new quilt the cotton is not compressed and as such it encloses more air which is bad conductor of heat. Therefore, it does not allow heat to pass.
77. Question: Curved rail tracks or curved roads are banked or raised on one side. Why?
Answer: Because a fast moving train or vehicle leans inwards while taking turn and the banked or raised track provides required centripetal force to enable it to move round the curve. 78. Question: How do bats fly in dark?
Answer: When bats fly they produce ultrasonic sound waves which are reflected back to them from the obstacles in their way and hence they can fly without difficulty.
79. Question: Water pipes often burst at hill stations on cold frosty nights. Why?
Answer: The temperature may fall below 00C during cold frosty nights which converts the water inside the pipes into ice, resulting in an increase in volume. This exerts great force on the pipes and as a result, they burst.
80. Question: Why are white clothes more comfortable in summer than dark or black ones?
Answer: White clothes are good reflectors and bad absorbers of heat, whereas dark or black clothes are good absorbers of heat. Therefore, white clothes are more comfortable because they do not absorb heat from the sun rays.
81. Question: Why does a rose appear red grass green in daylight?
Answer: Rose absorbs all the constituent colors of white light except red which is reflected to us. Similarly, grass absorbs all colors except green which is reflected t us.
82. Question: Why does a ship rise as it enters the sea from a river?
Answer: The density of sea water is high due to impurities and salts compared to river water
Answer: The density of sea water is high due to impurities and salts compared to river water as a result; the upthurst produced by the sea water on the ship is more than that of river water. 83.
76. Question: Why is a new quilt warmer than an old one? Answer: In a new quilt the cotton is not compressed and as such it encloses more air which is bad conductor of heat. Therefore, it does not allow heat to pass.
77. Question: Curved rail tracks or curved roads are banked or raised on one side. Why?
Answer: Because a fast moving train or vehicle leans inwards while taking turn and the banked or raised track provides required centripetal force to enable it to move round the curve. 78. Question: How do bats fly in dark?
Answer: When bats fly they produce ultrasonic sound waves which are reflected back to them from the obstacles in their way and hence they can fly without difficulty.
79. Question: Water pipes often burst at hill stations on cold frosty nights. Why?
Answer: The temperature may fall below 00C during cold frosty nights which converts the water inside the pipes into ice, resulting in an increase in volume. This exerts great force on the pipes and as a result, they burst.
80. Question: Why are white clothes more comfortable in summer than dark or black ones?
Answer: White clothes are good reflectors and bad absorbers of heat, whereas dark or black clothes are good absorbers of heat. Therefore, white clothes are more comfortable because they do not absorb heat from the sun rays.
81. Question: Why does a rose appear red grass green in daylight?
Answer: Rose absorbs all the constituent colors of white light except red which is reflected to us. Similarly, grass absorbs all colors except green which is reflected t us.
82. Question: Why does a ship rise as it enters the sea from a river?
Answer: The density of sea water is high due to impurities and salts compared to river water
Answer: The density of sea water is high due to impurities and salts compared to river water as a result; the upthurst produced by the sea water on the ship is more than that of river water. 83.