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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The dispersion relation for a type of waves is 2 = ak + .تعلط The wave number ہا for
which the phase velocity equals the group velocity is
६ 1
A − 8) ತ್ಮ
^ کو (8) b
1 ட் 1 ட்
∁−− ∁−−
(0) 36 ட) 3Vb
The radius of the second Bohr orbit of a singly ionised helium atom is
(A) 0.53 ^ (B) 1.06 ^
(C) 02654 (D) 0.132 ^
An electric cooker that has 1000 W rating is switched on for ten minutes. How much heat
does it produce ?
(A) 600 kJ (8) லப
(C) 6000 kJ (D) 6kJ
If a measurement x takes values 1, 2, 3 and 4 with probabilities tin each case, the values
of (x) will be
1
(A) 7 ൫) 1
5 2
(C) 5 (D) 5
A microcanonical ensemble has Q macro states, each with probability P, = 1/42. The
entropy of the system is
(A) Zero (8) 1 12
1
(0) छप त (D) - 10
If a quantum system is in one of a number of states |) with probability ए, then the
entity defined by p = 27 |) | is called
i
(A) Shannon entropy. (B) Probability density.
(C) Von Neumann entropy. (D) Density matrix.
The excess pressure p inside a spherical liquid droplet of radius r and surface tension y 15
4
(A) p=t و" هم
21
(6) pa (D) zero
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