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Latest CCRAS Medical Laboratory Technologist Exam Question (Objective Questions), MCQ in English

Subjects : medical laboratory technology, Research methodology, General awareness and information technology

Question Bank CCRAS Medical Laboratory Technologist Exam - English
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medical laboratory technology

Question 1Single Answer
Which sterilization method is most effective for heat-sensitive medical equipment?
  1. A
    Autoclaving
  2. B
    Ethylene oxide gas sterilization
  3. C
    Dry heat sterilization
  4. D
    Boiling
Question 2Single Answer
What is the primary purpose of using a laminar flow hood in a microbiology laboratory?
  1. A
    To sterilize culture media
  2. B
    To enhance microbial growth
  3. C
    To provide a sterile working environment
  4. D
    To store microbial cultures
Question 3Single Answer
Which microscopy technique is best suited for observing live, unstained bacteria?
  1. A
    Phase-contrast microscopy
  2. B
    Bright-field microscopy
  3. C
    Fluorescence microscopy
  4. D
    Electron microscopy
Question 4Single Answer
What is the primary role of peptone in culture media preparation?
  1. A
    To provide a carbon source
  2. B
    To enhance pigmentation
  3. C
    To act as a pH buffer
  4. D
    To supply nitrogen and amino acids
Question 5Single Answer
Which staining technique is used to differentiate Mycobacterium species from other bacteria?
  1. A
    Gram staining
  2. B
    India ink staining
  3. C
    Giemsa staining
  4. D
    Ziehl-Neelsen staining
Question 6Single Answer
What is the optimal temperature range for autoclaving to achieve sterilization?
  1. A
    100–110°C
  2. B
    150–160°C
  3. C
    121–134°C
  4. D
    170–180°C
Question 7Single Answer
Which disinfectant is most effective against bacterial endospores?
  1. A
    Ethanol
  2. B
    Glutaraldehyde
  3. C
    Sodium hypochlorite
  4. D
    Iodine
Question 8Single Answer
What is the primary function of agar in solid culture media?
  1. A
    To provide nutrients
  2. B
    To inhibit bacterial growth
  3. C
    To solidify the medium
  4. D
    To adjust pH
Question 9Single Answer
Which microscopy technique uses ultraviolet light to excite fluorescent dyes?
  1. A
    Bright-field microscopy
  2. B
    Dark-field microscopy
  3. C
    Fluorescence microscopy
  4. D
    Phase-contrast microscopy
Question 10Single Answer
What is the primary energy source for most chemolithotrophic bacteria?
  1. A
    Inorganic compounds
  2. B
    Organic compounds
  3. C
    Light energy
  4. D
    Glucose
Question 11Single Answer
Which component of the Gram stain differentiates Gram-positive from Gram-negative bacteria?
  1. A
    Crystal violet
  2. B
    Alcohol-acetone
  3. C
    Safranin
  4. D
    Iodine
Question 12Single Answer
What is the purpose of using a selective medium in microbial culture?
  1. A
    To inhibit the growth of specific microorganisms
  2. B
    To promote the growth of all microorganisms
  3. C
    To provide a sterile environment
  4. D
    To enhance pigment production
Question 13Single Answer
Which sterilization method is unsuitable for liquid media containing proteins?
  1. A
    Filtration
  2. B
    Gamma radiation
  3. C
    UV radiation
  4. D
    Autoclaving
Question 14Single Answer
What is the primary purpose of the negative staining technique?
  1. A
    To stain the bacterial cell wall
  2. B
    To detect acid-fast bacteria
  3. C
    To differentiate Gram-positive and Gram-negative bacteria
  4. D
    To visualize the background and leave the cell unstained
Question 15Single Answer
Which culture medium is specifically used to isolate Vibrio cholerae?
  1. A
    Thiosulfate-citrate-bile salts-sucrose (TCBS) agar
  2. B
    MacConkey agar
  3. C
    Blood agar
  4. D
    Mannitol salt agar
Question 16Single Answer
What is the role of the mordant in the Ziehl-Neelsen staining technique?
  1. A
    To decolorize the stain
  2. B
    To differentiate acid-fast bacteria
  3. C
    To counterstain the slide
  4. D
    To fix the stain to the bacterial cell
Question 17Single Answer
Which factor is critical for the growth of anaerobic bacteria in culture?
  1. A
    Absence of oxygen
  2. B
    High oxygen concentration
  3. C
    High pH levels
  4. D
    Low temperature
Question 18Single Answer
What is the primary advantage of using a scanning electron microscope over a light microscope?
  1. A
    Ability to observe live cells
  2. B
    Lower cost and ease of use
  3. C
    Higher resolution and 3D imaging
  4. D
    Enhanced color visualization
Question 19Single Answer
Which disinfectant is most effective for sterilizing laboratory surfaces contaminated with fungi?
  1. A
    Ethanol
  2. B
    Hydrogen peroxide
  3. C
    Sodium hypochlorite
  4. D
    Phenol
Question 20Single Answer
What is the purpose of using a differential medium in microbial culture?
  1. A
    To inhibit all microbial growth
  2. B
    To distinguish between different types of microorganisms
  3. C
    To provide a sterile environment
  4. D
    To promote anaerobic growth
Question 21Single Answer
Which staining technique is used to detect Cryptococcus neoformans in cerebrospinal fluid?
  1. A
    India ink staining
  2. B
    Gram staining
  3. C
    Ziehl-Neelsen staining
  4. D
    Giemsa staining
Question 22Single Answer
What is the primary source of carbon for autotrophic bacteria?
  1. A
    Carbon dioxide
  2. B
    Organic compounds
  3. C
    Glucose
  4. D
    Proteins
Question 23Single Answer
Which sterilization method uses high-energy ionizing radiation?
  1. A
    Gamma radiation
  2. B
    Dry heat sterilization
  3. C
    Autoclaving
  4. D
    Filtration
Question 24Single Answer
What is the purpose of using MacConkey agar in a microbiology lab?
  1. A
    To differentiate lactose-fermenting Gram-negative bacteria
  2. B
    To isolate Gram-positive bacteria
  3. C
    To promote fungal growth
  4. D
    To isolate anaerobic bacteria
Question 25Single Answer
Which component of a bacterial growth curve represents the phase of maximum growth rate?
  1. A
    Lag phase
  2. B
    Log phase
  3. C
    Stationary phase
  4. D
    Death phase
Question 26Single Answer
What is the primary disadvantage of using ultraviolet (UV) radiation for sterilization?
  1. A
    Limited penetration power
  2. B
    Ineffective against endospores
  3. C
    High cost of equipment
  4. D
    Long exposure time required
Question 27Single Answer
Which culture medium is used to isolate Staphylococcus aureus?
  1. A
    MacConkey agar
  2. B
    Mannitol salt agar
  3. C
    Blood agar
  4. D
    Sabouraud dextrose agar
Question 28Single Answer
What is the primary purpose of using a phase-contrast microscope in microbiology?
  1. A
    To observe stained bacterial cells
  2. B
    To visualize live, unstained cells with enhanced contrast
  3. C
    To detect fluorescently labeled cells
  4. D
    To provide high-resolution 3D images
Question 29Single Answer
Which chemical agent is used as a mordant in Gram staining?
  1. A
    Crystal violet
  2. B
    Safranin
  3. C
    Iodine
  4. D
    Alcohol
Question 30Single Answer
What is the primary purpose of using a candle jar in a microbiology lab?
  1. A
    To create a microaerophilic environment
  2. B
    To provide an anaerobic environment
  3. C
    To sterilize culture media
  4. D
    To promote fungal growth
Question 31Single Answer
Which bacterial structure is primarily responsible for Gram-positive bacteria retaining the crystal violet stain?
  1. A
    Cell membrane
  2. B
    Lipopolysaccharide layer
  3. C
    Peptidoglycan layer
  4. D
    Capsule
Question 32Single Answer
Which test is used to differentiate Streptococcus pneumoniae from other streptococci?
  1. A
    Catalase test
  2. B
    Optochin sensitivity test
  3. C
    Coagulase test
  4. D
    Oxidase test
Question 33Single Answer
Which bacterium is associated with peptic ulcer disease and is identified by the urease test?
  1. A
    Escherichia coli
  2. B
    Shigella dysenteriae
  3. C
    Salmonella typhi
  4. D
    Helicobacter pylori
Question 34Single Answer
What is the primary purpose of the Kirby-Bauer disk diffusion test?
  1. A
    To identify bacterial species
  2. B
    To determine antibiotic susceptibility
  3. C
    To measure bacterial growth rate
  4. D
    To detect bacterial toxins
Question 35Single Answer
Which bacterium is characterized by a "fried egg" appearance on culture media?
  1. A
    Mycobacterium tuberculosis
  2. B
    Mycoplasma pneumoniae
  3. C
    Clostridium perfringens
  4. D
    Bacillus anthracis
Question 36Single Answer
Which test is used to differentiate Staphylococcus aureus from other staphylococci?
  1. A
    Catalase test
  2. B
    Urease test
  3. C
    Oxidase test
  4. D
    Coagulase test
Question 37Single Answer
Which bacterium is responsible for causing diphtheria and is identified by the Elek test?
  1. A
    Bacillus cereus
  2. B
    Clostridium tetani
  3. C
    Corynebacterium diphtheriae
  4. D
    Listeria monocytogenes
Question 38Single Answer
What is the primary source of infection for Vibrio cholerae?
  1. A
    Contaminated food
  2. B
    Contaminated water
  3. C
    Direct contact
  4. D
    Airborne transmission
Question 39Single Answer
Which bacterium is characterized by its "swarming motility" on agar plates?
  1. A
    Escherichia coli
  2. B
    Shigella flexneri
  3. C
    Salmonella typhi
  4. D
    Proteus mirabilis
Question 40Single Answer
What is the purpose of the E-test in bacteriology?
  1. A
    To determine the minimum inhibitory concentration (MI
  2. B
    To identify bacterial species
  3. C
    of an antibiotic
Question 41Single Answer
Which bacterium is associated with gas gangrene and is identified by the Nagler reaction?
  1. A
    Clostridium perfringens
  2. B
    Clostridium difficile
  3. C
    Clostridium tetani
  4. D
    Clostridium botulinum
Question 42Single Answer
Which biochemical test is used to differentiate Enterobacteriaceae from other Gram-negative bacteria?
  1. A
    Catalase test
  2. B
    Urease test
  3. C
    Coagulase test
  4. D
    Oxidase test
Question 43Single Answer
Which bacterium is responsible for causing tuberculosis and is acid-fast positive?
  1. A
    Streptococcus pyogenes
  2. B
    Mycobacterium tuberculosis
  3. C
    Staphylococcus aureus
  4. D
    Escherichia coli
Question 44Single Answer
What is the primary purpose of the API 20E system in bacteriology?
  1. A
    To perform antibiotic susceptibility testing
  2. B
    To measure bacterial growth rate
  3. C
    To detect bacterial toxins
  4. D
    To identify Enterobacteriaceae
Question 45Single Answer
Which bacterium is associated with whooping cough and is cultured on Bordet-Gengou agar?
  1. A
    Haemophilus influenzae
  2. B
    Bordetella pertussis
  3. C
    Neisseria meningitidis
  4. D
    Streptococcus pneumoniae
Question 46Single Answer
Which test is used to differentiate Salmonella from Shigella?
  1. A
    Catalase test
  2. B
    Oxidase test
  3. C
    Coagulase test
  4. D
    TSI (Triple Sugar Iron) test
Question 47Single Answer
Which bacterium is responsible for causing anthrax and forms "medusa head" colonies?
  1. A
    Listeria monocytogenes
  2. B
    Bacillus cereus
  3. C
    Clostridium perfringens
  4. D
    Bacillus anthracis
Question 48Single Answer
What is the primary purpose of the VITEK system in a microbiology lab?
  1. A
    To perform Gram staining
  2. B
    To automate bacterial identification and susceptibility testing
  3. C
    To detect fungal infections
  4. D
    To measure viral load
Question 49Single Answer
Which bacterium is associated with food poisoning and is identified by its beta-hemolytic colonies on blood agar?
  1. A
    Escherichia coli
  2. B
    Salmonella enterica
  3. C
    Staphylococcus aureus
  4. D
    Shigella dysenteriae
Question 50Single Answer
Which antibiotic is commonly used to treat infections caused by methicillin-resistant Staphylococcus aureus (MRSA)?
  1. A
    Vancomycin
  2. B
    Penicillin
  3. C
    Amoxicillin
  4. D
    Tetracycline
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