Kerala PSC Previous Years Question Paper & Answer
Page:6
Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'SCIENTIFIC OFFICER (PHYSICS) -KERALA POLICE SERVICE (FORENSIC SCIENCE LABORATORY)' And exam conducted in the year 2021. And Question paper code was '019/2021'. Medium of question paper was in Malayalam or English . Booklet Alphacode was 'A'. Answer keys are given at the bottom, but we suggest you to try answering the questions yourself and compare the key along wih to check your performance. Because we would like you to do and practice by yourself.
26. Which among the following is NOT true about the Common Mode Rejection Ratio
(CMRR) of an Op-Amp ?
(५) CMRR = 2019810 ൭8.
Ay
(B) The larger the value of CMRR, the better the circuit operation.
(C) For large values of CMRR, the output voltage will be due mostly to the
difference signal.
(D) Larger the value of CMRR, the lower the chance that common-mode signal
being rejected.
27. What will be the output voltage of the given circuit 7
100102
Spt
100 12
(A) 1V ൫ ۷
(C) 0% (D) 3V
28. Identify the following circuit :
(A) Second order low pass filter (8) First order high pass filter
(6) _ First order low pass filter (D) Second order high pass filter
29. The noise produced by the random motion of charge carriers is
(^) flicker noise (B) 51101 noise
(C) Johnson noise (2) 1/fnoise
30. Which is the modulation system in which there are pulses of constant amplitude and
length but with varying timing ?
(A) Pulse Position Modulation رمق Pulse Width Modulation
(C) Pulse Code Modulation (D) Pulse Amplitude Modulation
019/2021 7 0 _ 899 6