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Free download in PDF Sterilization Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The process in which all living cells, spores and viruses are completely destroyed from an object is called _____.
[A]
Disinfection
[B]
Pasteurization
[C]
Sterilization
[D]
Antisepsis
(2)
_______ is an antiseptic.
[A]
Chlorine
[B]
Copper Sulphate
[C]
Ozone
[D]
70% ethanol
(3)
Same DNA sequence may code for more than one protein by ______
[A]
Gene splitting
[B]
RNA splitting
[C]
Alternative splicing of RNA
[D]
None
Answer: Alternative splicing of RNA
(4)
Glucose that is taken in by a bacterial cell is made to stay within the cell by _______.
[A]
Attaching to membranes
[B]
Immediate utilization
[C]
Phosphorylation
[D]
None of the above
(5)
_____ is a predator bacterium that infects other gram negative bacteria.
[A]
Haemophilus influenza
[B]
Pseudomonas putida
[C]
Proteus mirabilis
[D]
Bdellovibrio
(6)
Which of the following is not a type of sterilization?
[A]
Batch
[B]
Continuous
[C]
Filter
[D]
Submerged
(7)
What do you mean by sterilization?
[A]
Purification of products
[B]
Recovery of products
[C]
Elimination of contamination
[D]
None Of The Above
Answer: Elimination of contamination
(8)
The highest feasible temperature for batch sterilization is ________
[A]
124°C
[B]
120°C
[C]
121°C
[D]
None of these
(9)
The destruction of microorganisms by moist heat is described by ______________
[A]
Zero-order reaction
[B]
First-order reaction
[C]
Third-order reaction
[D]
Second-order reaction
Answer: First-order reaction
(10)
The long exposure of batch sterilization may lead to ____________
[A]
Purification of media
[B]
Recovery of media
[C]
Degradation
[D]
Good quality of product
(11)
What is the advantage of batch sterilization over continuous sterilization?
[A]
Superior maintenance of medium quality
[B]
Ease of scale-up
[C]
Automatic control
[D]
Lower equipment costs
Answer: Lower equipment costs
(12)
The equation for Del factor is _____________
[A]
∇ = ln (N0/Nt)
[B]
∇ = ln (Nt/N0)
[C]
∇ = ln (N0)
[D]
None of the above
(13)
The Del Factor decreases as the initial number of organisms _____________
[A]
Decreases
[B]
Increases
[C]
Remains constant
[D]
Becomes zero
(14)
How long does it take for the autoclave to complete its cycle?
[A]
30-35 minutes
[B]
50 min to 1 hr
[C]
15-20 minutes
[D]
10-15 minutes
(15)
Which scientists introduced the term ‘Del factor’?
[A]
Deindoerfer and Humphrey
[B]
Jacob and Monod
[C]
Banks and Corbett
[D]
None of these
Answer: Deindoerfer and Humphrey
(16)
Which of the following reaction occurs during the sterilization which results in browning of media?
[A]
Sandmeyer reaction
[B]
Maillard reaction
[C]
Cannizzaro reaction
[D]
Gattermann reaction
Answer: Maillard reaction
(17)
If the foreign microorganism invades the fermentation, which of the following is not likely to occur?
[A]
The medium will not allow the growth of contaminant
[B]
The contaminant may outgrow the production organism
[C]
The contaminant may contaminate the final product
[D]
The contaminant may degrade the final product
Answer: The medium will not allow the growth of contaminant
(18)
UHT sterilization involves high temperature exposure of objects for _____.
[A]
1 – 3 seconds
[B]
1 – 3 minutes
[C]
1 – 3 hours
[D]
10 – 30 hours
(19)
_____ RNA polymerase has a single subunit.
[A]
E. coli
[B]
Bacillus subtilis
[C]
T7
[D]
λ phage
(20)
The best form of DNA to transform E. coli is ______.
[A]
Linear
[B]
Covalently closed
[C]
Nicked circles
[D]
None Of The Above
Answer: Covalently closed
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