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Physical Sciences Physical Pharmaceutics II Experiments

Aim

Theory

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Procedure

Simulation

Posttest

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Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Determination of Particle Size Distribution by Sedimentation Method (Using Andreasen Pipette)

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1. The Andreasen pipette is positioned at a fixed depth to:

a: Prevent evaporation Explanation

Explanation

b: Measure viscosity of fluid Explanation

Explanation

c: Ensure sampling from a consistent level during sedimentation Explanation

Explanation

d: Increase settling speed Explanation

Explanation

2. The mass of solids obtained at different time intervals helps to:

a: Determine the density of the fluid Explanation

Explanation

b: Calculate the particle size distribution Explanation

Explanation

c: Measure viscosity Explanation

Explanation

d: Determine temperature variation Explanation

Explanation

3. If larger particles settle faster, samples taken at later times will contain:

a: More coarse particles Explanation

Explanation

b: No solid material Explanation

Explanation

c: Finer particles still in suspension Explanation

Explanation

d: Equal proportions of all particles Explanation

Explanation

4. The final graph plotted in this experiment is between:

a: Particle mass and time Explanation

Explanation

b: Velocity and density Explanation

Explanation

c: Cumulative percentage of particles finer than each size vs. particle diameter Explanation

Explanation

d: Density and viscosity Explanation

Explanation

5. The sedimentation method is most suitable for determining particle sizes in the range of:

a: 0.05–0.5 µm Explanation

Explanation

b: 0.5–100 µm Explanation

Explanation

c: 100–1000 µm Explanation

Explanation

d: Above 1 mm Explanation

Explanation

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