Biological Indicators Practice Questions

Question 1

What is the best investigation for identifying malaria species?

Accepted Answer

Thin smear with Giemsa

Answer

Thick smear

Answer

QBC

Answer

Thin smear with acridine orange

Question 2

ICD-10 chapter 1 describes?

Accepted Answer

Infectious and parasitic diseases

Answer

Poisoning and consequences

Answer

Psychiatric diseases

Answer

Diseases of the nervous system

Question 3

The quality control agent for sterilization in an autoclave is:

Accepted Answer

Bacillus stearothermophilus

Answer

Bacillus globigii

Answer

Bacillus subtilis

Answer

Bacillus pumilus

Question 4

Endoscope is sterilized by:

Accepted Answer

Glutaraldehyde

Answer

Formalin

Answer

Autoclaving

Answer

Boiling

Question 5

The germ tube test is done for:

Accepted Answer

Candida albicans

Answer

Neisseria gonorrhoeae

Answer

Bacterial vaginosis

Answer

Chlamydia

Question 6

Which spores are used to test the efficacy of moist heat sterilization?

Accepted Answer

Bacillus stearothermophilus

Answer

Clostridium tetani

Answer

Bacillus subtilis

Answer

Clostridium botulinum

Question 7

Heat-labile instruments for use in surgical procedures can be best sterilized by what method?

Accepted Answer

Ethylene oxide gas

Answer

Absolute alcohol

Answer

Ultraviolet rays

Answer

Chlorine releasing compounds

Question 8

A 30-year-old male with a 3-month history of evening fever, night sweats, 8 kg weight loss, and haemoptysis presents to a chest clinic. He is HIV-negative. A direct sputum smear is prepared and stained (Image 2). The smear shows ≥10 acid-fast bacilli per oil immersion field averaged over 20 fields. Based on this finding, which of the following statements regarding the smear result and its clinical significance is correct?

Accepted Answer

A. The smear grade indicates ≥10 bacilli per field averaged over 20 fields, signifying high bacillary load and high infectivity

Answer

B. The smear grade indicates 1–9 bacilli per 100 fields, classified as scanty and requiring repeat testing before treatment initiation

Answer

C. The smear grade indicates 10–99 bacilli per 100 fields, classified as Grade 1+ and sufficient for treatment initiation

Answer

D. The smear grade indicates 1–10 bacilli per field averaged over 50 fields, classified as Grade 2+ and correlating with moderate bacillary load

Question 9

Which agent is used for the sterilization of a cystoscope?

Accepted Answer

Glutaraldehyde

Answer

Formaldehyde

Answer

Isopropyl alcohol

Answer

Ethylene oxide

Question 10

What is the biological indicator used for sterilization control in membrane filters?

Accepted Answer

Brevundimonas diminuta

Answer

Bacillus pumilis

Answer

Bacillus stearothermophilus

Answer

Clostridium tetani

Biological Indicators — MCQs

Biological Indicators — MCQs

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