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Physical Agents MCQ Questions & Answers

Physical Agents MCQs : This section focuses on the "Physical Agents". These Multiple Choice Questions (MCQs) should be practiced to improve the Physical Agents skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

Among the following which one is the most effective method of killing microorganisms?

A. High temperature
B. Low temperature
C. High temperature, high moisture
D. Low temperature, high moisture

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Question 2

How much time is required by spores of Clostridium botulinum to be killed by moist heat at 1200C?

A. 2 hours
B. 4 to 20 minutes
C. 24 hours
D. 6-7 hours

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Question 3

Passage of water from a low solute concentration into the cell is referred to as ______________

A. plasmoptysis
B. plasmolysis
C. isotonic
D. hypertonic

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Question 4

Some amount of air is also essential inside the chamber of the autoclave.

A. True
B. False

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Question 5

The general pressure at which the autoclave is operated is ___________

A. 5 Psi
B. 20 Psi
C. 15 Psi
D. 40 Psi

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Question 6

Vegetative cells are much more sensitive to heat than are spores.

A. True
B. False

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Question 7

Wavelengths around ___________ have the highest bactericidal efficiency.

A. 150 Å
B. 3900 Å
C. 2650 Å
D. 1500 Å

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Question 8

Which material is used for the Berkefeld filter?

A. diatomaceous earth
B. asbestos pad
C. porcelain
D. sintered glass disks

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Question 9

Which of the following actions occur due to low temperature?

A. coagulation of proteins
B. death of microorganisms
C. rate of metabolism is reduced
D. denatures proteins

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Question 10

Which of the following are resistant to desiccation?

A. gonococci
B. streptococci
C. meningococci
D. bacillus

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Question 11

Which of the following conditions are required for the determination of thermal death time?

A. temperature is varied
B. time is fixed
C. temperature is fixed and time is varied
D. temperature is fixed and time is not selected

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Question 12

Which of the following inhibits DNA replication?

A. cathode rays
B. UV light
C. x-rays
D. gamma rays

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Question 13

Which of the following instruments is used to perform tyndallization?

A. Autoclave
B. Steam Arnold
C. Gas oven
D. Incubator

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Question 14

Which of the following apparatus is used to provide steam under regulated pressure?

A. autoclave
B. laminar air flow
C. incubator
D. hot oven

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Question 15

Which of the following methods is used for killing microorganisms of only certain types and not all microorganisms?

A. Pasteurization
B. Incineration
C. Boiling water
D. Fractional Sterilization

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Question 16

Which of the following radiations have the energy to knock electrons away from molecules and ionize them?

A. Non-ionizing radiations
B. Acoustic radiations
C. Subatomic particles
D. Ionizing radiations

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