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Latest BTSC SMO Microbiology Exam Question (Objective Questions), MCQ in English

Subjects : Microbiology

Question Bank BTSC Specialist Medical Officer (Microbiology) Exam - English
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Microbiology

Question 1Single Answer
What is the complete elimination or destruction of all forms of microbial life, including spores, called?
  1. A
    Disinfection
  2. B
    Antisepsis
  3. C
    Sterilization
  4. D
    Sanitization
Question 2Single Answer
Which of the following sterilization methods uses moist heat under pressure?
  1. A
    Dry heat sterilization
  2. B
    Filtration
  3. C
    Autoclaving
  4. D
    Radiation
Question 3Single Answer
What is the standard temperature and pressure used in an autoclave for sterilization?
  1. A
    100°C at 10 psi for 15 minutes
  2. B
    121°C at 15 psi for 15-20 minutes
  3. C
    134°C at 20 psi for 5-10 minutes
  4. D
    160°C for 2 hours
Question 4Single Answer
Which sterilization method is suitable for heat-labile materials like some plastics and pharmaceuticals?
  1. A
    Autoclaving
  2. B
    Dry heat sterilization
  3. C
    Filtration
  4. D
    Incineration
Question 5Single Answer
Which type of radiation is commonly used for sterilizing medical devices and pharmaceuticals?
  1. A
    Ultraviolet (UV) radiation
  2. B
    Infrared (IR) radiation
  3. C
    Gamma radiation
  4. D
    Microwave radiation
Question 6Single Answer
What is the primary mechanism of action of dry heat sterilization?
  1. A
    Coagulation of proteins
  2. B
    Oxidation
  3. C
    Disruption of cell membranes
  4. D
    Damage to nucleic acids
Question 7Single Answer
What is the term for the reduction or elimination of pathogenic microorganisms to a level where they are no longer hazardous?
  1. A
    Sterilization
  2. B
    Disinfection
  3. C
    Antisepsis
  4. D
    Sanitization
Question 8Single Answer
Which of the following is a high-level disinfectant that can achieve sterilization with prolonged exposure?
  1. A
    Ethanol (70%)
  2. B
    Hydrogen peroxide (3%)
  3. C
    Glutaraldehyde (2%)
  4. D
    Quaternary ammonium compounds
Question 9Single Answer
Which of the following is an example of a halogen used as a disinfectant?
  1. A
    Formaldehyde
  2. B
    Phenol
  3. C
    Iodine
  4. D
    Chlorhexidine
Question 10Single Answer
What is the mechanism of action of alcohol-based disinfectants?
  1. A
    Oxidation
  2. B
    Alkylation
  3. C
    Protein denaturation and lipid dissolution
  4. D
    Intercalation into DNA
Question 11Single Answer
Which of the following factors can influence the effectiveness of a disinfectant?
  1. A
    Concentration of the disinfectant
  2. B
    Contact time
  3. C
    Presence of organic matter
  4. D
    All of the above
Question 12Single Answer
What is antisepsis?
  1. A
    The process of making an object safe for public use
  2. B
    The destruction of microorganisms on living tissue
  3. C
    The removal of transient microorganisms from the skin by mechanical cleaning
  4. D
    The complete elimination of all microorganisms from an inanimate object
Question 13Single Answer
Which of the following is commonly used as an antiseptic on skin?
  1. A
    Bleach
  2. B
    Formaldehyde
  3. C
    Chlorhexidine
  4. D
    Glutaraldehyde
Question 14Single Answer
What is sanitization?
  1. A
    The process of sterilization
  2. B
    The reduction of the microbial load on an inanimate surface to a safe public health level
  3. C
    The killing of all pathogenic microorganisms
  4. D
    The inhibition of bacterial growth
Question 15Single Answer
What is lyophilization?
  1. A
    Heating a substance to very high temperatures to kill microorganisms
  2. B
    Freezing a substance and then removing the ice by sublimation under vacuum
  3. C
    Treating a substance with chemical disinfectants
  4. D
    Filtering a liquid to remove microorganisms
Question 16Single Answer
What is the primary purpose of lyophilization in microbiology?
  1. A
    To increase the size of microorganisms for easier observation
  2. B
    To preserve microorganisms for long-term storage
  3. C
    To enhance the virulence of microorganisms
  4. D
    To inactivate microorganisms completely
Question 17Single Answer
Which of the following types of microorganisms is most resistant to sterilization procedures?
  1. A
    Vegetative bacteria
  2. B
    Fungal spores
  3. C
    Bacterial endospores
  4. D
    Enveloped viruses
Question 18Single Answer
Which chemical agent is commonly used for sterilizing heat-sensitive medical equipment in hospitals?
  1. A
    Ethanol
  2. B
    Formaldehyde gas
  3. C
    Phenol
  4. D
    Hydrogen peroxide (3%)
Question 19Single Answer
What is the purpose of biological indicators in sterilization monitoring?
  1. A
    To measure the temperature and pressure reached during the sterilization cycle
  2. B
    To detect the presence of chemical residues after sterilization
  3. C
    To confirm that the sterilization process has killed highly resistant microorganisms, typically bacterial spores
  4. D
    To assess the cleanliness of the sterilized items
Question 20Single Answer
What is the basic structural unit of bacteria?
  1. A
    Hypha
  2. B
    Spore
  3. C
    Cell
  4. D
    Virus
Question 21Single Answer
Bacteria with a spherical shape are called:
  1. A
    Bacilli
  2. B
    Cocci
  3. C
    Spirilla
  4. D
    Vibrio
Question 22Single Answer
Bacteria with a rod-like shape are called:
  1. A
    Cocci
  2. B
    Spirilla
  3. C
    Bacilli
  4. D
    Vibrio
Question 23Single Answer
Bacteria with a spiral or helical shape are called:
  1. A
    Cocci
  2. B
    Bacilli
  3. C
    Spirilla
  4. D
    Vibrio
Question 24Single Answer
Bacteria with a comma-like or curved rod shape are called:
  1. A
    Cocci
  2. B
    Bacilli
  3. C
    Spirilla
  4. D
    Vibrio
Question 25Single Answer
What term describes cocci arranged in chains?
  1. A
    Staphylococci
  2. B
    Streptococci
  3. C
    Diplococci
  4. D
    Tetrads
Question 26Single Answer
What term describes cocci arranged in grape-like clusters?
  1. A
    Streptococci
  2. B
    Diplococci
  3. C
    Tetrads
  4. D
    Staphylococci
Question 27Single Answer
What term describes cocci arranged in pairs?
  1. A
    Streptococci
  2. B
    Staphylococci
  3. C
    Diplococci
  4. D
    Sarcinae
Question 28Single Answer
What is the primary function of the bacterial cell wall?
  1. A
    Energy production
  2. B
    Protein synthesis
  3. C
    Maintaining cell shape and protecting against osmotic lysis
  4. D
    Genetic material storage
Question 29Single Answer
What is the major component of the bacterial cell wall in most bacteria?
  1. A
    Cellulose
  2. B
    Chitin
  3. C
    Peptidoglycan
  4. D
    Lipopolysaccharide
Question 30Single Answer
Which of the following bacterial structures is responsible for motility in many species?
  1. A
    Capsule
  2. B
    Cell wall
  3. C
    Flagella
  4. D
    Pili
Question 31Single Answer
What are pili (fimbriae) primarily involved in?
  1. A
    Motility
  2. B
    Adherence to surfaces
  3. C
    Genetic material transfer
  4. D
    Spore formation
Question 32Single Answer
What is the glycocalyx, and what are its two main forms?
  1. A
    The outer layer of the bacterial cell wall; peptidoglycan and teichoic acid
  2. B
    A layer of polysaccharide and/or protein surrounding the cell; capsule and slime layer
  3. C
    The bacterial cytoplasmic membrane; phospholipids and proteins
  4. D
    Internal storage granules; glycogen and polyphosphate
Question 33Single Answer
What is the primary function of a bacterial capsule?
  1. A
    Providing rigidity to the cell
  2. B
    Facilitating nutrient uptake
  3. C
    Protection from phagocytosis
  4. D
    Aiding in reproduction
Question 34Single Answer
Where is the genetic material of a bacterium primarily located?
  1. A
    Nucleus
  2. B
    Mitochondria
  3. C
    Nucleoid
  4. D
    Endoplasmic reticulum
Question 35Single Answer
What are plasmids?
  1. A
    Essential components of the bacterial chromosome
  2. B
    Small, circular, extrachromosomal DNA molecules
  3. C
    Storage granules within the cytoplasm
  4. D
    Protein filaments involved in cell division
Question 36Single Answer
Which bacterial genera are well-known for their ability to form endospores?
  1. A
    Streptococcus and Staphylococcus
  2. B
    Escherichia and Salmonella
  3. C
    Bacillus and Clostridium
  4. D
    Neisseria and Haemophilus
Question 37Single Answer
What is the process by which a vegetative bacterium transforms into an endospore called?
  1. A
    Germination
  2. B
    Sporulation
  3. C
    Binary fission
  4. D
    Conjugation
Question 38Single Answer
What is the process by which an endospore returns to its metabolically active vegetative state called?
  1. A
    Sporulation
  2. B
    Binary fission
  3. C
    Germination
  4. D
    Transformation
Question 39Single Answer
Which of the following is a characteristic feature of archaea that distinguishes them from bacteria?
  1. A
    Presence of peptidoglycan in the cell wall
  2. B
    Membrane lipids with ester linkages
  3. C
    Ability to form endospores
  4. D
    Presence of introns in some genes
Question 40Single Answer
What is the basic structural unit of fungi?
  1. A
    Pseudopods
  2. B
    Hyphae
  3. C
    Cilia
  4. D
    Flagella
Question 41Single Answer
A mass of intertwined hyphae is called a:
  1. A
    Spore
  2. B
    Mycelium
  3. C
    Bud
  4. D
    Pseudohyphae
Question 42Single Answer
Which of the following is a unicellular fungus?
  1. A
    Mold
  2. B
    Mushroom
  3. C
    Yeast
  4. D
    Dermatophyte
Question 43Single Answer
What is the primary mode of reproduction for most bacteria?
  1. A
    Sexual reproduction
  2. B
    Budding
  3. C
    Binary fission
  4. D
    Spore formation
Question 44Single Answer
Which of the following is a characteristic feature of viruses?
  1. A
    They are prokaryotic cells
  2. B
    They contain both DNA and RNA
  3. C
    They are obligate intracellular parasites
  4. D
    They reproduce by binary fission
Question 45Single Answer
What is the protein coat surrounding the genetic material of a virus called?
  1. A
    Envelope
  2. B
    Capsid
  3. C
    Tegument
  4. D
    Matrix
Question 46Single Answer
What is the outermost layer of some viruses, derived from the host cell membrane, called?
  1. A
    Capsid
  2. B
    Nucleocapsid
  3. C
    Envelope
  4. D
    Genome
Question 47Single Answer
What are protozoa?
  1. A
    Acellular infectious agents
  2. B
    Unicellular eukaryotic microorganisms
  3. C
    Multicellular prokaryotic organisms
  4. D
    Filamentous fungi
Question 48Single Answer
Which of the following is a characteristic feature used to classify protozoa?
  1. A
    Cell wall composition
  2. B
    Presence of peptidoglycan
  3. C
    Mode of locomotion
  4. D
    Ability to form endospores
Question 49Single Answer
What are the four main groups of protozoa based on their motility?
  1. A
    Cocci, bacilli, spirilla, vibrio
  2. B
    Gram-positive, Gram-negative, acid-fast, Gram-variable
  3. C
    Flagellates, amoebae, ciliates, sporozoans
  4. D
    Yeasts, molds, mushrooms, dermatophytes
Question 50Single Answer
What are algae?
  1. A
    Unicellular prokaryotes
  2. B
    Multicellular fungi
  3. C
    Photosynthetic eukaryotic microorganisms
  4. D
    Non-motile protozoa
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