Kerala PSC Previous Years Question Paper & Answer

Title : Microbiologist - Food Safety (Govt. Analytical Laboratory)
Question Code : A


Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'Microbiologist - Food Safety (Govt. Analytical Laboratory) ' And exam conducted in the year 2022. And Question paper code was '27/2022'. 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.

page: 5 out of 16
Excerpt of Question Code: 27/2022








Greatest resolution is obtained by using a lens with

A) Large possible ೧೧7೦10೦೩
Small possible numerica
Large possible ೧೧7೦೦೩

D) Small possible ೧೧7೦1೦೩

aperture and light of the shortest wavelength
aperture and light of the shortest wavelength
aperture and light of the longest wavelength
aperture and light of the longest wavelength

Thin and distinctively shaped, Treponema pallidum, the causative agent of syphilis is
better identified in clinical specimens, by using

A) Phase contrast microsco
C) Fluorescent microscope

Which of the following statem

A) Charged molecules are ‏ام‎
‎the positive and negative

B) The molecules separate
charge and size

pe B) Dark field microscope

D) Differential interference contrast microscope

ent is not true of gel electrophoresis ?

laced in an electrical field and allowed to migrate towards

as they move at different rates due to their differences in

C) As DNA is negatively charged, it is loaded into wells at the negative pole of the gel

and it migrates towards t
D) Each fragment’s migration

Choose the techniques whic!

he positive
rate is directly proportional to the log of its molecular weight

11 are effective in the purification of a virus preparation.

i. Differential centrifugation

ii. Gradient centrifugation

A) iand ii

iv. Polyacrylamide gel electrophoresis
B) ii and iii

©) iii and iv 0) । ೩೧೮ iv

Which of the following statements is/are not true of sedimentation ?

i. The sedimentation rate

of a given particle will be zero when the density of the

particle and the surrounding medium are equal.

ii. The greater the frictional
iii. The greater the centrifug

centrifugal field.
A) iand ii

8) i and iii

coefficient is, the slower a particle will move.
jal force is, the slower the particle sediments.

. The denser the biological buffer system is, the slower the particle will move in a

©) Only iii D) Only iv

Caesium chloride, widely employed in the density gradient centrifugation, is used for the

i. Banding of DNA
ர்‌. Isolation of plasmids

iv. Isolation of viruses
A) Only i

8) i and ii

ii. Isolation of nucleoproteins

©) ॥ ii, iii and iv D) Only iv

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