Practice Questions

  1. Home
  2. Free Resources
  3. Practice Questions
  4. 19359
TLS Online TPP Program

#Question id: 10558

In a vertically oriented glass capillary tube, the upward movement of water is due to

#XL - R Botany
  1. The attraction of water to the polar surface of the glass tube (adhesion) and the surface tension of water, which tends to minimize the area of the air–water interface
  2. The upward movement of water is due to the positive hydrostatic pressure(Yp)
  3. The attraction of water to the polar surface of the glass tube (cohesion) and the surface tension of water, which tends to minimize the area of the air–water interface
  4. Gravity (Yg) causes water to move upward
More Questions
TLS Online TPP Program

#Question id: 35936

#XL - U Food Technology

Which of the following statements regarding microbial growth kinetics are correct?
TLS Online TPP Program

#Question id: 35937

#XL - U Food Technology

Which of the following are true regarding D-value (Decimal reduction time) in microbial death kinetics?
TLS Online TPP Program

#Question id: 35938

#XL - U Food Technology

Which of the following statements are correct about the Z-value in microbial thermal death kinetics?
A. Z-value is the temperature increase required to reduce the D-value by one log cycle.
B. A higher Z-value indicates that the microorganism is more sensitive to temperature changes.
C. Z-value helps in comparing the thermal resistance of different microorganisms.
D. Z-value is independent of the heating medium.
E. Z-value can be used to optimize time-temperature combinations in thermal processing.
TLS Online TPP Program

#Question id: 35939

#XL - U Food Technology

A bacterial culture has an initial population of 1×104cells/mL. The population doubles every 30 minutes. What will be the population (in cells/mL) after 2 hours?
TLS Online TPP Program

#Question id: 35940

#XL - U Food Technology

In a batch culture, the specific growth rate (𝜇) of a microbe is 0.693 h-1. What is the doubling time (in hours) of this organism?
TLS Online TPP Program

#Question id: 35941

#XL - U Food Technology

A microbial population declines from 1×108CFU/mL to 1×104CFU/mL in 30 minutes during thermal processing. Assuming first-order death kinetics, calculate the decimal reduction time (D-value) in minutes.
(Use: 𝑁=𝑁0×10−𝑡 / 𝐷)