41. Sound travels at the fastest speed in
42. Oil raise up the wick in a lamp. The principle involves
43. Superconductors are substances which
44. Light travels at the fastest speed in:
45. Railway tracks are banked on curves
46. 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
47. 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?
48. Intensity of sound at a point is ____ its distance from the source.
49. Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
50. Radio telescopes are better than optical telescopes because
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