Automobile Engineering in ME
The most accurate ignition system of a spark ignition engine is

Magneto and electronic system
Battery system
Electronic control unit system
Magneto system

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

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

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