Physics
A galvanometer can be converted into a voltmeter by connecting with it a

Low resistance on parallel
Low resistance in series
High resistance in parallel
High resistance on series

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Physics
Plants are dried up in winter due to frost because

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

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Physics
Railway tracks are banked on curves so that

The train may not fall down inwards
No frictional force may be produced between the tracks and the wheels of the train
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
Necessary centrifugal force may be obtained from the horizontal component of the weight of the train

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