Q42. Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
Q43. If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same
Q47. On a rainy day, small oil films on water show brilliant colours. This is due to
Q48. Materials for rain-proof coats and tents owe their water-proof properties to

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