Continuous Assessment No 03

2.

Brownian movement of particle ............. sedimentation

Assist
Promote
Prevent
Increase

Correct Answer

A. Prevent

Explanation

The correct answer is "prevent". Brownian movement refers to the random motion of particles in a fluid due to collisions with other particles. This movement helps to prevent sedimentation, which is the process of particles settling at the bottom of a fluid due to gravity. The random motion of particles disrupts the settling process and prevents them from rapidly sinking to the bottom.

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1

3.

Suspension of hydrophobic drug formulated with ...........

Emulsifying agents
Wetting agents
Suspending agents
All of the above

Correct Answer

A. Wetting agents

Explanation

Wetting agents are used to improve the spreading and penetration of a liquid on a solid surface. In the context of suspending a hydrophobic drug, wetting agents can help to increase the drug's solubility and dispersion within the formulation. This allows the drug to be more evenly distributed throughout the suspension, enhancing its stability and effectiveness. Therefore, the use of wetting agents is a suitable explanation for the correct answer.

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4.

Wetting ability of vehicle is detected by observing ..........

Angle of repose
Contact angle
Critical angle
None of the above

Correct Answer

A. Contact angle

Explanation

The wetting ability of a vehicle is determined by observing the contact angle. The contact angle refers to the angle formed between the liquid droplet and the surface of the vehicle. A smaller contact angle indicates better wetting ability, as the liquid spreads out more evenly on the surface. On the other hand, a larger contact angle indicates poor wetting ability, as the liquid tends to bead up and not spread out effectively. Therefore, by observing the contact angle, one can assess the wetting ability of the vehicle.

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5.

Which of the following test is used to compare different suspensions?

Physical evaluation
Sedimentation
Rheological evaluation
None of the above

Correct Answer

A. Rheological evaluation

Explanation

Rheological evaluation is used to compare different suspensions. Rheology is the study of the flow and deformation of materials, and rheological evaluation involves measuring the viscosity, elasticity, and other properties of suspensions. By comparing these properties, one can determine the differences in flow behavior and stability between different suspensions. Therefore, rheological evaluation is the appropriate test for comparing different suspensions.

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6.

Stokes law is related to

Syrup
Suspension
Solution
None of the above

Correct Answer

A. Suspension

Explanation

Stokes law is related to suspension. Stokes law describes the motion of small particles in a viscous fluid. It states that the velocity of a small spherical particle moving through a viscous fluid is directly proportional to the force acting on it and the radius of the particle, and inversely proportional to the viscosity of the fluid. This law is commonly used to calculate the settling velocity of particles in a suspension, which is important in various fields such as sedimentation, filtration, and particle separation.

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7.

Structured vehicle is included in the formulation of a suspension in order to

Prevent sedimentation
Decrease interfacial tension
Prevent cake formation
None of the above

Correct Answer

A. Prevent sedimentation

Explanation

A structured vehicle is included in the formulation of a suspension to prevent sedimentation. Sedimentation refers to the settling down of solid particles in a suspension over time due to gravity. By incorporating a structured vehicle, which typically consists of thickening agents or stabilizers, the suspension's particles are prevented from settling and forming a sediment at the bottom. This helps maintain the uniform distribution of the solid particles throughout the suspension, ensuring its stability and effectiveness.

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8.

Sedimentation volume of ideal suspension should be

Less than one
More than one
Equal to one
Zero

Correct Answer

A. Equal to one

Explanation

The sedimentation volume of an ideal suspension should be equal to one. This means that the volume of sediment formed after the suspension settles should be equal to the original volume of the suspension. In an ideal suspension, the particles are evenly dispersed and do not settle too quickly or too slowly. Therefore, when the suspension settles, it should form a compact sediment without any excess volume or loss of volume.

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9.

During storage period, In suspension crystal growth is observed due to

Absorption of water
Fluctuations in the ambient temperatures
Presence of suspending agents
None of the above

Correct Answer

A. Fluctuations in the ambient temperatures

Explanation

Fluctuations in the ambient temperatures can cause changes in the solubility of the solute in the solvent, leading to the formation of crystals. When the temperature decreases, the solubility decreases, causing the solute to come out of solution and form crystals. Similarly, when the temperature increases, the solubility increases, causing the crystals to dissolve. These temperature fluctuations during the storage period can promote crystal growth in suspension. The other options, such as absorption of water or presence of suspending agents, do not directly explain the observed crystal growth in suspension.

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10.

In the formulation development of suspension, what type of diameter is important?

Sieve
Stoke's
Projected
Length number

Correct Answer

A. Stoke's

Explanation

In the formulation development of suspension, Stoke's diameter is important. Stoke's diameter is a measure of the particle size in a suspension. It is calculated based on the settling velocity of particles in a fluid. By determining the Stoke's diameter, the sedimentation rate and stability of the suspension can be assessed. Therefore, understanding Stoke's diameter is crucial in formulating suspensions to ensure proper particle distribution and stability.

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Continuous Assessment No 03

Suspended particles become floccculated in a suspension,because

Quiz Preview

Brownian movement of particle ............. sedimentation

Suspension of hydrophobic drug formulated with ...........

Wetting ability of vehicle is detected by observing ..........

Which of the following test is used to compare different suspensions?

Stokes law is related to

Structured vehicle is included in the formulation of a suspension in order to

Sedimentation volume of ideal suspension should be

During storage period, In suspension crystal growth is observed due to

In the formulation development of suspension, what type of diameter is important?