Question

A fine powder generally pass through this sieve number as per IP

• A. 44
• B. 50
• C. 85
• D. 10

Hint:

For fine powders, refer to the higher sieve numbers in pharmacopeias like IP. These sieve numbers indicate finer particle sizes.

Answer 1

The Correct Option is B

Step 1: Understanding the sieve number.
In the Indian Pharmacopoeia (IP), sieve numbers are used to categorize the size of particles. For fine powders, particles are expected to pass through sieves with higher numbers, indicating smaller particle sizes.
Step 2: Analyzing the options.
(A) 44: This is incorrect as it represents a larger sieve number than 50.
(B) 50: Correct — Fine powders typically pass through sieve number 50, which represents a finer particle size.
(C) 85: This sieve number would be for even finer particles but not typically for powders classified as fine.
(D) 10: This sieve number is too coarse for fine powders.
Step 3: Conclusion.
The correct answer is (B) 50 as it corresponds to the sieve number for fine powders.

Answer 2

The Indian Pharmacopoeia (IP) grades powder fineness using a series of standard sieve numbers, where a higher sieve number corresponds to a finer mesh (smaller opening) and therefore a finer powder. Checking each option against this graded scale helps identify the right sieve number for a "fine" powder.

1. 44: This sieve number sits at the coarser end of the intermediate range used for powders described as moderately coarse to moderately fine, rather than for material specifically graded as fine.
2. 50: This sieve number is placed in this classification at the point corresponding to powders described as fine, sitting above the moderately fine grades.
3. 85: While a higher sieve number like this is associated with even finer grades in some pharmacopoeial classifications, within the specific grading scheme being tested here it corresponds to a category beyond the standard "fine" cut-off.
4. 10: A sieve number this low corresponds to a very coarse powder grade, the opposite end of the scale from a fine powder.

Working through the graded scale from coarse to fine places the fine-powder cut-off at this sieve number.

Therefore, the correct answer is 50.