Kerala PSC Previous Years Question Paper & Answer
Page:20
Below are the scanned copy of Kerala Public Service Commission (KPSC) Question Paper with answer keys of Exam Name 'Research Officer- Chemistry/ Biochemistry' And exam conducted in the year 2023. And Question paper code was '027/2023/OL'. Medium of question paper was in Malayalam or English . Booklet Alphacode was ''. 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.
Question84:-Statement | : SEM is least appropriate for small particles
Statement Il: Small nanoparticles contribute very little to the signal obtained by
SEM. Find the correct option from the following
A:-Statement | is correct and Statement II is incorrect
B:-Statement | 15 correct and Statement II is the correct explanation for
statement |
C:-Statement | is correct and Statement Il is not the correct explanation for
statement |
D:-Both statements are incorrect
Correct Answer:- Option-B
Question85:-Which of the following is a greener route to produce ethanol
commercially?
A:-Catalytic cracking of ethanol
B:-Dehydrogenation of ethylene
C:-Steam of reforming of methanol
D:-Oxidation of ethene with an ionic catalyst
Correct Answer:- Option-D
Question86:-The term Cryptand refers to
A:-Macrocyclic ligands with nitrogen donor
B:-Macrocyclic ligands with sulphur and nitrogen donor
C:-Macromolecules with nitrogen and oxygen donor
D:-Aliphatic ligands with nitrogen, sulphur and oxygen donor
Correct Answer:- Option-C
Question87:-Which of the following is an anion receptor?
A:-Carboxy peptidase A
B:-Crown ether
C:-Valinomycin
D:-Cryptand
Correct Answer:- Option-A
Question88:-Which enzyme regulates the external signal flapping in the molecular
switches?
A:-Trypsin
B:-Helicase
C:-Kinase
D:-DNA polymerase
Correct Answer:- Option-C
Question89:-Supramolecular Calixarenes contain
A:-COOH