Q1: Match the following:

	List I		List II
A.	RC coupled amplifier	1.	Very low drift
B.	Tuned amplifier	2.	Flat frequency response from zero frequency onwards
C.	Chopper stabilized amplifier	3.	Flat frequency response with upper and lower cut off frequency
D.	DC amplifier	4.	Peak in gain frequency response

ANS:C - A-3, B-4, C-1, D-2

An RC coupled response is first increasing...then max. For certain period of frequency then decreasing. Hence, it is max. In a centre band of frequencies and low at high and low frequencies due to capacitive effect of transistor and coupling capacitor respectively.( so, 2 cutoff frequencies).

A DC coupled is has a constant gain from zero and then decreases(so 1 cutoff frequency).

And tuned one shows peak gain at only it's tuned/resonance frequency.