Pasteurization MCQ : Here you will find MCQ Questions related to "Pasteurization" in Food Processing Unit Operations. These Pasteurization MCQ Questions Will help you to improve your Food Processing Unit Operations knowledge and will prepare you for various Examinations like Competitive Exams, Placements, Interviews and other Entrance Exmaniations.
Question 1
Pasteurization or pasteurisation is a process in which packaged and non-packaged foods (such as milk and fruit juice) are treated with mild heat, usually to?
A. less than 150 °C
B. less than 100 °C
C. less than 120 °C
D. None of the above
View Answer
Ans : B
Explanation: Pasteurization or pasteurisation is a process in which packaged and non-packaged foods (such as milk and fruit juice) are treated with mild heat, usually to less than 100 °C (212 °F), to eliminate pathogens and extend shelf life.
Question 2
Which of the following non-thermal processes that are also used to pasteurize foods?
A. HPP
B. PEF
C. Pascalization
D. All of the above
View Answer
Ans : D
Explanation: Pascalization or high pressure processing (HPP) and pulsed electric field (PEF) are non-thermal processes that are also used to pasteurize foods
Question 3
LTST is a patented method that implies spraying droplets in a chamber heated below the usual pasteurization temperatures. It takes several thousandth of a second to treat liquid products, so the method is also known as the?
A. MST
B. CST
C. TST
D. PST
View Answer
Ans : A
Explanation: Low Temperature, Short Time (LTST) is a patented method that implies spraying droplets in a chamber heated below the usual pasteurization temperatures. It takes several thousandth of a second to treat liquid products, so the method is also known as the millisecond technology (MST).
Question 4
Medical equipment, notably respiratory and anesthesia equipment, is often disinfected using hot water, as an alternative to chemical disinfection. The temperature is raised to 70°C (158°F) for ?
A. 15 minutes
B. 20 minutes
C. 25 minutes
D. 30 minutes
View Answer
Ans : D
Explanation: Medical equipment, notably respiratory and anesthesia equipment, is often disinfected using hot water, as an alternative to chemical disinfection. The temperature is raised to 70°C (158°F) for 30 minutes.
Question 5
The process of Pasteurization was discovered by
A. C.F Bennett
B. Sir Louis Pasteur
C. Sir Schuyler Skaats Wheeler
D. Sir Samuel W. Francis
View Answer
Ans : B
Explanation: The process of Pasteurization was discovered by Sir Louis Pasteur.
Question 6
Which of the following is called as cold pasteurization?
A. Freeze drying
B. Heating under low pressure
C. Irradiation
D. Heating at low temperature
View Answer
Ans : C
Explanation: The irradiation is also known as cold pasteurization as it destroys the foodborne disease caused by pathogenic microorganisms and parasites. Unlike pasteurization, this method does not use any heat in the process instead uses the high energy rays to kill the microbes.
Question 7
Pasteurization processes are fully effective in destroying __________
A. bacillus
B. thermus
C. campylobacter
D. thermoplasma
View Answer
Ans : C
Explanation: Pasteurization processes are fully effective in destroying campylobacter. Other bacteria like thermos, bacillus and thermoplasmaare thermophiles which can grow at high temperature and cannot be destroyed by pasteurization process.
Question 8
A pasteurization process operates to ________reductions of the target organism.
A. 2 log
B. 3 log
C. 4 log
D. 5 log
View Answer
Ans : B
Explanation: A pasteurization process usually operates to 6 log reductions of the target organism. The sterilized foods have to achieve at least 12 log reductions in case of Clostridium botulinum spores. The pasteurization has lower log reductions because of the reduced risks linked with the target microbial species when associated with the botulinum toxin.
Question 9
Microwave volumetric heating (MVH) is the newest available pasteurization technology.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: Microwave volumetric heating (MVH) is the newest available pasteurization technology. It uses microwaves to heat liquids, suspensions, or semi-solids in a continuous flow.
Question 10
Milk is an excellent medium for microbial growth
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
View Answer
Ans : A
Explanation: True, Milk is an excellent medium for microbial growth