Question

If a mass of solid particles is packed by tapping, the bulk density of the mass:

• A. decreases
• B. increases
• C. remains unchanged
• D. can not be predicted, more information is required

Hint:

Tapping or compacting solid particles increases their bulk density as particles are forced closer together, reducing the voids between them.

Answer 1

The Correct Option is B

Step 1: Effect of Tapping.
Tapping solid particles, as seen in packing or compaction, causes them to move closer, reducing the spaces between them. Consequently, the bulk density of the mass increases because the same quantity of material occupies less volume.

Step 2: Evaluation of Choices.
- (A) Tapping does not decrease bulk density; it increases it by compacting particles. - (C) Bulk density does not remain constant when tapping occurs; it generally increases due to compaction. - (D) Additional data is unnecessary, as the impact of tapping on density is established knowledge.

Final Determination: \[\boxed{\text{B) increases}}\]