Micromeritics & Powder Rheology | Physical Pharmacy | GPAT Mock Test

1. Which of the following diameters is defined as the diameter of a sphere having the same surface area as the particle?

2. The Andreasen pipette works on the principle of:

3. A powder with an angle of repose greater than 50 degrees is considered to have:

4. The BET (Brunauer-Emmett-Teller) equation is primarily used to determine:

5. Which density measurement excludes inter-particle voids but includes intra-particle pores?

6. The Kozeny-Carman equation is used in which method of surface area determination?

7. A Hausner’s ratio of 1.15 indicates what type of powder flow?

8. The number of particles per unit weight (N) can be calculated using the formula involving volume-surface mean diameter (dvs) and true density (ρ). What is the correct formula?

9. For spherical particles, the porosity of a powder in its loosest possible packing (cubic arrangement) is approximately:

10. The sieving method is most suitable for determining the particle size of powders in which range?

11. Bulkiness of a powder is the reciprocal of:

12. In a normal distribution curve for particle size, the mean, median, and mode are:

13. The Hatch-Choate equations are used to convert:

14. Which method of particle size analysis can provide a 3D representation and information about particle shape?

15. The term ‘porosity’ or ‘voids’ (ε) is expressed by which of the following equations?

16. A log-normal distribution is often used for particle size data because:

17. Which of the following is a significant limitation of the optical microscopy method for particle size analysis?

18. The number average particle size gives more weight to:

19. In the context of powder packing, a rhombohedral arrangement represents the:

20. Which of the following properties is NOT derived from bulk and tapped density measurements?

21. True density of a porous solid is determined using:

22. The weight average particle size gives more weight to:

23. Stokes’ Law assumes that the particles are:

24. A Carr’s Index value of 25% indicates that the powder has what kind of flow property?

25. The diameter measured between two tangents on opposite sides of the particle, parallel to a fixed direction, is known as: