Salaam,
Dear sir i m a bit confused abt the ans of Q No 5. According to my very limited knowledge of cars and internal combustion engines, the carburetor is nowadays replaced by the EFI system. These cars do not use a proper carburetor and for mixing petrol with air, it is the "Throttle Valve" which does the job. So I find my fingers crossed, when both of the options appear to be viable as a correct answer.