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: Understanding the effect of tapping.
When solid particles are tapped (such as in packing or compaction), the particles move closer together, reducing the void spaces between them. This results in an increase in the bulk density of the mass, as the same amount of material occupies a smaller volume.

Step 2: Analysis of options.
- (A) Tapping does not cause a decrease in bulk density; rather, it compacts the particles, increasing the density. - (C) The bulk density does not remain unchanged during tapping; it typically increases due to compaction. - (D) More information is not needed, as the effect of tapping on density is well-established.

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