<CENTER>JUNIOR SCIENTIFIC OFFICER EXAM MODEL QUESTIONS AND ANSWERS</CENTER>

KERALA PSC JUNIOR SCIENTIFIC OFFICER EXAM MODEL QUESTIONS AND ANSWERS

1.Which of the following organic groups are found in naturally occuring amino acids?
A.Guanidinium ion
B.Indole
C.Imidazole
D.All of these
Answer: Option D

2.Which of the following bacteria lack a cell wall and are therefore resistant to penicillin?
A.Cyanobacteria

B.Mycoplasmas
C.Bdellovibrios

D.Spirochetes
Answer: Option B

3.Polyprotic acids such as H3PO4, can act as acid-base buffers
A.only in combination with polyprotic bases
B.if their concentration is kept low
C.at pH values around neutrality
D.at pH values around any of their pKa's
Answer: Option D

4.The oldest eukaryotic organisms are considered to be
A.diplomonads like Giardia
B.archaea
C.fungi
D.animals
Answer: Option B

5.The pH of a solution is determined by
A.concentration of salt
B.relative concentration of acids and bases
C.dielectric constant of the medium
D.environmental effect

Answer: Option B

6.The physical nature of genomes is studied under
A.structural genomics
B.comparative genomics
C.proteo genomics
D. functional genomics

Answer: Option A

7.Which of the following indicates that the pK of an acid is numerically equal to the pH of the solution when the molar concentration of the acid and its conjugate base are equal?
A.Michaelis-Menten equation
B.Haldanes equation
C.Henderson-Hasselbalch equation
D.Hardy-Windberg law
Answer: Option C

8.Which of the following is least likely to have a rigid cell wall?
A.     Bacterium    B.     Archaean
C.     Fungus    D.     Protozoan
Answer: Option D

9.The time required to kill 90% of the microorganisms in a sample at a specific temperature is the
A.decimal reduction time
B.thermal death point
C.F value
D.D value
Answer: Option D

10.The pH of a solution is determined by
A.concentration of salt
B.relative concentration of acids and bases
C.dielectric constant of the medium
D.environmental effect

Answer: Option B