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  • Question
  • The lowest temperature that kills all microorganisms in a liquid suspension in 10 minutes is known as the


  • Options
  • A. decimal reduction time
  • B. thermal death point
  • C. thermal death temperature
  • D. thermal death time

  • Correct Answer
  • thermal death point 


  • Physical and Chemical Agents problems


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    • 1. Which of the following describes the effect of ionizing radiation on microbes?

    • Options
    • A. Changes the 3-dimensional structure of proteins to a 2-dimen-sional form
    • B. Substantially decreases enzymatic activity, slowing microbial reproduction
    • C. Induces electrons and protons to jump out of the molecules of the microbe
    • D. None of the above
    • Discuss
    • 2. A(n)____is used to prevent infection by killing or inhibiting pathogen growth on animal tissues.

    • Options
    • A. bacteriostatic agent
    • B. sanitizer
    • C. disinfectant
    • D. antiseptic
    • Discuss
    • 3. If a 1:600 dilution of a test compound kills a standard population of Staphylococcus aureus in 10 minutes but not 5 minutes while a 1:60 dilution of phenol kills the population in the same time, what is the phenol coefficient of the test compound?

    • Options
    • A. 1
    • B. 5
    • C. 10
    • D. 50
    • Discuss
    • 4. Which of the following was the first widely used antiseptic and disinfectant?

    • Options
    • A. Chlorine
    • B. Phenol
    • C. Iodine
    • D. Alcohol
    • Discuss
    • 5. Which disinfectant would be most effective against Staphylococcus found in a blood spill?

    • Options
    • A. Phenol
    • B. Cetylpyridinium chloride
    • C. Hexachlorophene
    • D. None of these
    • Discuss
    • 6. Which of the following is not a disinfectant containing a heavy metal?

    • Options
    • A. Silver nitrate
    • B. Mercurochrome
    • C. Copper sulfate
    • D. Chlorine
    • Discuss
    • 7. Which of the following tests is designed to simulate the natural conditions under which the disinfectants are used in hospitals?

    • Options
    • A. Phenol coefficient test
    • B. Minimum inhibitory concentration test
    • C. Capacity test
    • D. None of these
    • Discuss
    • 8. The process of making an object free from living organisms including bacterial and fungal spores and viruses is known as

    • Options
    • A. pasteurization
    • B. antisepsis
    • C. disinfection
    • D. sterilization
    • Discuss
    • 9. The organisms retained in the fluids filtered by Seitz filter is

    • Options
    • A. Proteus
    • B. Staphylococcus
    • C. Clostridium
    • D. None of these
    • Discuss
    • 10. Which of the following is a limitation of the autoclave?

    • Options
    • A. It takes too long to sterilize
    • B. It lacks the ability to inactivate viruses
    • C. It lacks the ability to kill endospores
    • D. It will destroy heat labile materials
    • Discuss


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