Kerala PSC Previous Years Question Paper & Answer
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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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Identify the indirect band gap material :
(A) Crystalline Silicon (B) Indium Arsenide
(C) Amorphous Silicon (D) Gallium Arsenide
Identify the lattice represented by the primitive vectors
0.1.11...
(A) Simple cubic (B) Body-centred cubic
(6) Face-centred cubic (D) Hexagonal
What is the packing fraction of a simple cubic lattice ?
(A) 0.68 (B) 0.74
(൭ 0.34 (D) 0.52
Identify the crystal that has ionic bonding
(A) Diamond (B) Silicon
(C) Sodium Chloride (D) Magnesium
21.2
The dispersion relation for an electron is given by E(k) = . Its effective mass is
m
given by
(A) m (B) m2
(൭ وھ )0( ہد
The density of states for a bulk three-dimensional semiconducting crystal is given by:
(A) £) = (8) 80) व 81/2
(0) gE) ಇ ೫2 (0) ഏം
Identify the Type -1 superconductor among the following :
(4) Niobium (B) Vanadium
(6) Technetium (D) Aluminium
When a superconducting sample is placed in a magnetic field, super currents are
generated to screen the fields from penetrating into the bulk of the sample. This
phenomenon is called
(4) Flux quantisation (B) Josephson effect
(C) Meissner effect (൩) Ginzburg-London effect
What is the probability that the electron in the ground state of hydrogen will be found
outside the first Bohr radius ?
(^) Zero (B) 32.3%
(C) 67.7% (D) 50%
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