Oh, I didn't know because honestly I haven't revved up the car when it is stationary. Actually my father noticed this and told me about this. Anyways I took it to Honda's for a checkup and they also confirmed that it was perfectly alright., they showed some other cars too. Got my disc pads changed instead.
There is another query though, that in the winter the front shocks produced a squeaking noise when I go on a speed breaker. The Honda guys told me to wait till winter is over and then get the shocks changed. The noise started coming in the winter and it is more especially in the morning.
This type of noise starting coming from 04 city after it was driven 200k kms and at that moment the suspension had to be changed completely because it was kaput.