Physics
Hydraulic brakes in automobile work on

Poiseuille's principle
Archimedes' principle
Pascal's principle
Bernoulli's principle

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Physics
Plants are dried up in winter due to frost because

There is mechanical loss of tissues and drought condition prevails
Evaporation does not take place
Photosynthesis does not take place at such low temperature
Respiration does not take place at low temperature

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Physics
Thermohaline circulation is mainly due to

Warm water being added to the ocean due to industial waste
Winds causing circulation of ocean water
Warmer, less dense water sinking in the ocean and cold water replacing it
Cold, dense ocean water sinking and warmer water replacing it

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