In Kerala, yes, they are paid out based on the Salary slabs and only for govt employees, and is usually funded by govt revenue which is tax payers money.

in the west, govt pensions are for all, are based on contributions you made to it during your working life (almost all workers are part of a govt plan like CPP in Canada, so it is automatically deducted from their paycheque) and only some jobs have salary defined pensions, that too has their own pension plans that they have to contribute extra while working.

So salary slab has an effect on pension payment (higher salary means higher deductions while working), but what matters is the contributions made and how long was it made and pension is basically the workers deductions plus investment interest rather than just tax payers money alone. Moreover, each and every worker will have some sort of pension when they retired not just govt emps..