31. Hydraulic machines work under the Principle of :
32. Alcohol is more volatile than water because ________ is lower than water.
33. A manometer is used to measure
34. Anemometer is used to measure
35. The instrument used to measure the speed of the wind is
36. The sudden fall of atmospheric pressure indicates
37. Hydraulic brakes in automobile work on
38. When the barometer reading dips suddenly, it is an indication of
39. A storm is predicted if atmospheric pressure
40. On which principle does the hydraulic lift works?
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