Chemical Engineering Basics
Rain drops falling through atmospheric air attain limited terminal velocity, because of

Viscous force exerted by air
Force of gravity
Upward thrust due to air
Surface tension effects of water

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Chemical Engineering Basics
Compression ratio of an I.C. engine is the ratio of the

Pressure after compression to that before compression
Clearance volume to the volume swept by piston per stroke
Volume of air in cylinder before compression to that after compression
None of these

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