Gain of filter circuits has following measuring unit

Gain of filter circuits has following measuring unita.dBb.degreesc.Neperd.Bel

What is the voltage gain (Av) of the following amplifier circuit:

. Find out the incorrect statement about activeand passive filters.Gain is not attenuated in active filterPassive filters are less expensiveActive filter does not cause loading of sourcePassive filters are difficult to tune or adjust

If the Wein Bridge Oscillator based on op-amp is tuned at 1KHz, what is the gain of feedback network? a. 2 b. 1/3 c. 3 d. 1/2

The above figure exhibit the response of the band pass filter. fL = Lower cut off frequencyfH = Higher cut off frequencyGain at the fH  is 10 dBWhat will be the gain (theoretical) at the central frequency?a.13 dBb.11 dBc.0 dBd.12 dB