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Sterilization Online Exam Quiz

Important questions about Sterilization. Sterilization MCQ questions with answers. Sterilization exam questions and answers for students and interviews.

1. The heat conduction in dry air is

Options

A : less rapid than in steam

B : more rapid than in steam

C : similar to steam

D : none of these

2. The destruction of microorganisms by steam may be described as

Options

A : first order chemical reaction

B : zero order chemical reaction

C : second order chemical reaction

D : none of these

3. For laminar flow of Newtonian fluid through a smooth round pipe, the ratio of average fluid velocity to the maximum velocity is

Options

A : 0.5

B : 0.75

C : 0.87

D : 0.37

4. Sterilization can be carried out by

Options

A : heat

B : radiation

C : chemical agents

D : all of these

5. The highest temperature which appears to be feasible for batch sterilization is

Options

A : 121°C

B : 100°C

C : 105°C

D : 130°C

6. The X 90 value for a filtration system is

Options

A : the time required to reduce microbial population by 90%

B : the time required to traverse survivor curve by one log cycle.

C : the depth required to reduce population by 90%

D : the depth of the filter required to reduce population by 99%

7. In sterilization process, spore of which of the following organism is considered as control?

Options

A : Bacillus subtilis

B : Clostridium botulinum

C : Bacillus stearothermophilus

D : Aspergillus niger

8. The collection efficiency by diffusion increases with

Options

A : decreasing particle size

B : decreasing air velocity

C : both (a) and (b)

D : increasing particle size

9. Model proposed by the Friedlander, correlating the air filtration efficiency by impaction can be expressed as (where N St is the Stokes number)

Options

A : ? imp = 0.075 N St 1.2

B : ? imp = 0.75 N St 1.2

C : ? imp = 0.25 N St 1.2

D : ? imp = 0.025 N St 1.2

10. The K used in the equation for X 10 =2.303/K depends upon

Options

A : nature of the filter material

B : linear velocity of the air passing through filter

C : both (a) and (b)

D : thickness of the filter

1. The reduction of number of cells from 10 10 to one will result into the del factor (?) of

Options

A : 1

B : 10

C : 23

D : 10 3

2. If the packing density (?) is defined as the volume of the fiber unit volume of filter bed, the velocity within the filter void space is equal to (where V is velocity in fluid void space and V 0 is undisturbed fluid velocity)

Options

A : V = V 0 /(1-?)

B : V-V 0 = 1 - ?

C : V = V 0 (1 - ?)

D : V = V 0 /(1 + ?)

3. For the turbulent flow, the dispersion coefficient is correlated as a function of

Options

A : Reynolds number

B : Sherwood number

C : Schmidt number

D : Grashof number

4. The deviation from ideal plug flow due to axial mixing can be described by the

Options

A : dispersion model

B : Langmuir model

C : Friedlander model

D : Pasceri model

5. The del factor (?) increases as the final number of cells

Options

A : decreases

B : increases

C : zero

D : constant

6. For indirect heating, the plate and frame heat exchanger is generally more effective than the shell and tube heat transfer due to its

Options

A : larger heat transfer area

B : smaller heat transfer area

C : lesser cost

D : more number of plates

7. The overall del factor (?) may be represented as

Options

A : ? overall = ? heating + ? holding - ? cooling

B : ? overall = ? heating + ? holding + ? cooling

C : ? overall = ? heating - ? holding + ? cooling

D : ? overall = ? heating - ? holding - ? cooling

8. Typical aeration rates for aerobic fermentation are

Options

A : 0 - 0.5 vvm

B : 0.5 - 1.0 vvm

C : 1.0 - 1.5 vvm

D : 1.5 - 2.0 vvm

9. The typical size of particles collected by diffusion mechanism is

Options

A : <0.25?m

B : <0.5?m

C : <0.75?m

D : <1?m

10. Analogus to the molecular diffusion, the x-directional flux of microorganisms suspended in a medium due to the axial mixing can be represented as (where J n is flux component ' n ', c n is concentration of' n ')

Options

A : J n = - dc n / dx

B : J n = dc n / dx

C : J n = - D dc n / dx

D : J n = D dc n / dx

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