Kerala PSC Previous Years Question Paper & Answer
Page:14
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.
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The total number of guided modes in a step index fibre is NOT related to
(4) the V number. (B) _ length of the fibre.
(6) _ radius of the fibre core. (D) numerical aperture of the fibre.
The mean optical power launched into an 8 km long of fibre that has no connectors or
splices is 100 uW. If the mean optical power at the fibre output is 10 ரர, the overall
signal attenuation in decibels is
(^) 10dB (B) ط۵
(0) 23 68 (0) 4668
Consider a beam of light of wavelength 7. incident normally on a system of a polariser
and an analyser. The analyser is oriented at 45° to the polariser. When an optical
component is introduced between them, the output intensity becomes zero. The optical
component is
(A) ൭ quarter-wave plate. (B) 8 thin lens.
(6) ahalf-wave plate. (൩) 8 glass plate.
Light travelling between two points in a medium takes a path for which
(A) distance is always minimum. (B) time of flight is extremum.
(C) time of flight is always minimum. (2) distance is extremum.
The wavelength of a photon that has an energy of 3.6 eV is
(A) 870 nm (B) 542 صم
(C) 450 ஙா (D) 345 पा
The chemical potential of an ideal Bose gas at any temperature will be
(A) लाल zero or negative (8) _ necessarily positive
(C) necessarily negative (D) either zero or positive
Which among the following crystal structure has a wrong coordination number given ?
(A) _ face centred cubic - 6 (B) diamond - 4
(6) body centred cubic - 8 (D) hexagonal closed packed - 12
A plane cubic lattice intercepts the three crystallographic axes at ۲
2a
ا
Nis
respectively. The Miller indices of the plane are
(A) (342) (8) 243)
(C) (634) (೧) (231)
The exciting radiation in a Raman scattering experiment is 5460 A and the Stokes line is
at 5520A. The wavelength of the anti-Stokes line is at
(A) 42204 (8) 65504
(6) 5400A (D) 5720A
The electromagnetic wave passing though a medium has an electric field
E = 70 cos(107 x + 107 9 - 1015 02 . The refractive index of the medium is
(A) 1.0 (B) 1.5
(C) 3.0 (D) 42
019/2021 7 0 14 ↽∆