General Knowledge :: Physics
- Oil raise up the wick in a lamp. The principle involves
- Superconductors are substances which
- Railway tracks are banked on curves
- On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
- Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
- Intensity of sound at a point is ____ its distance from the source.
- Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
- Radio telescopes are better than optical telescopes because
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A.
necessary centrifugal force may be obtained from the horizontal component weight of the train |
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B.
to avoid frictional force between the tracks and wheels |
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C.
necessary centripetal force may be obtained from the horizontal component of the weight of the train |
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D.
the train may not fly off in the opposite direction |