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 'Demonstrator in Electronics and Instrumentation & Demonstrator in Instrument Technology' And exam conducted in the year 2022. And Question paper code was '129/2022'. 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.
129/22
81. Which phenomenon causes polarization of light ?
A) Total internal reflection B) Interference
C) Double refraction D) None of these
82. In a Newton's ring experiment, diameter of 10 0೩ ring due to a wavelength of
500 nm in water (u= 1.5) is 5 mm. The radius of curvature of lens is
A) 157 cm B) 187 cm
0) 19300 ம) 16700
83. Match the following :
i. Photodiode a. High sensitivity
ii. PIN diode b. Microwave switch
iii. Avalanche photodiode c. Low output response
iv. LED d. Fast output response
v. Phototransistor
൧) 1-൦. 1-0, ४-8, v-d
۰" +4: ४-०
C) i-d, ॥॥-൭, ४-०, v-b
D) None of these
84. Which of the following is true about Numerical Aperture (NA) ?
i. NA determines the light gathering ability of fibre
ii. It depends only on the refractive indices of core and cladding
iii. It’s value ranges from 0.5 to 1
iv. It is defined as sine of critical angle
A) Only i, ii and iv are true
8) Only i, ii and iii are true
C) Only i and ii are true
D) Allthe above are true
85. Match the following :
i. Ruby Laser a. T.H. Maiman
ii. Argon Laser b. 2 level laser
iii. He-Ne Laser c. ion laser
iv. Semiconductor laser d. 632.8 nm
A) i-a 1௦, 46, ۷۸۵
8) i-d, 4 ॥-0, iv-b
©) i-a ii-c, ர் ங்
D) None of these