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Q. Red light is used in traffic signals because
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Q. In barometer mercury is preferred over water because
Q. The absolute zero on celsius scale is
Q. The source of the sun's energy is the process of
Q. Beta rays emitted by a radioactive material are
Q. Which one of the following is a source of methane emission into the atmosphere?
Q. If the temperature of a patient is 40°C his temperature on fahrenheit will be
Q. A thick glass tumbler cracks more easily than a thin one when hot water is poured into it. Why?
Q. Pieces of camphor placed on water move about rapidly. This is because of
Q. A gas thermometer is more sensitive than a liquid thermometer as a gas:
Q. What is the scale used for measuring the intensity of the earthquake?
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