Automobile Engineering in ME
The main function of the tread pattern on tyre is that

The tread grooves pass air between the tyre and road surface, thereby preventing tyre from overheating
In wet conditions, the tread grooves expel water that is drawn between the tyre and road surface
The crests between the tread grooves absorb road noise
The tread pattern protects the tyre's inner carcass from small stones and pieces of glass

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Automobile Engineering in ME
The composition of the electrolyte in a fully charged battery is that

The electrolyte is pure distilled water
The electrolyte is a mixture of 90% distilled water and 10% sulphuric acid by weight
The electrolyte is a mixture of 64% distilled water and 36% sulphuric acid by weight
The electrolyte is pure sulphuric acid

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Automobile Engineering in ME
The main function of a master cylinder is to

Convert brake pedal force into hydraulic pressure
Adjust the extent of brake pedal free play
Ensure that all the wheel brakes are supplied with the same amount of fluid pressure
Boost the force applied to brake pedal

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