21. The atmospheric air is held to the Earth by :
22. The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with
23. A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because
24. Why does bleeding occur through the nose in high mountainous regions ?
25. Which of the following instruments is used to measure humidity ?
26. Anemometer is an instrument meant for measuring ________
27. A fountain pen works on the principle of
28. A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.
29. The temperature at which water boils depends mainly on
30. Air pressure is measured in which of the following units?
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