Automobile Engineering in ME
A battery can be charged by

Applying voltage in the reverse direction to that of charging
Adding sulphuric acid
Adding distilled water
Applying a voltage in the same direction to that of charging

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Automobile Engineering in ME
The drive-shafts are connected to the differential and wheel hubs through universal joints because the universal joints

Compensate for variations in the relative positions of the differential and the wheels which result from bumpy road surfaces or other similar driving conditions.
None of these
Absorb the vibrations transferred from the surface of the road
Absorb any difference in speed between the left and right wheels when the vehicle is turning

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