Question

Given below are two statements:

Statement (I): Drift is more serious problem with dusts compared to sprays.

Statement (II): Drift can be minimized by producing sprays having small volume mean diameter (VMD).

In light of the above statements, choose the most appropriate answer from the options given below.

• A. Both Statement (I) and Statement (II) are correct.
• B. Both Statement (I) and Statement (II) are incorrect.
• C. Statement (I) is correct but Statement (II) is incorrect.
• D. Statement (I) is incorrect but Statement (II) is correct.

Hint:

Think about whether fine or coarse droplets resist wind drift better.

Answer 1

The Correct Option is C

Drift happens when applied particles are light enough for wind to carry them away from the target before they land. Dust particles are solid and dry with almost no weight, so even gentle air movement pushes them off course, which is why dusts are known to drift worse than sprays.

For a liquid spray, droplet size decides how much wind can move it. A droplet with a small volume mean diameter is tiny and light, so it behaves almost like a dust particle and drifts away easily. A droplet with a large volume mean diameter is heavier for its size and falls more directly onto the target.

So reducing drift calls for a LARGER volume mean diameter, not a smaller one, which means Statement (II) states the opposite of the correct practice.

\[\boxed{\text{Statement (I) true, Statement (II) false}}\]