Question

Which of the following is the correct choice of particle size measurement technique in scoring order ofsize?
(i) Sieve
(ii) Anderson Pipette
(iii) Coulter counter
(iv) Light scattering
Arrange the correct order

• A. ii, iv, iii, i
• B. ii, iv, iii, i
• C. i, iii, ii, iv
• D. iv, i, iii, ii

Answer 1

The Correct Option is A

To solve the question regarding the choice of particle size measurement techniques, it's essential to understand the principle and typical application range of each method. Let's break down each option:

• Sieve: Sieves are used for measuring larger particles, typically in the range of millimeters down to about 45 micrometers. They are not suitable for fine particle measurements.
• Anderson Pipette: This is used for sedimentation-based measurements, which is ideal for particles ranging approximately from 1 micrometer to 100 micrometers. It's often used for finer particles than those analyzed by sieves.
• Coulter Counter: This method measures particles based on changes in electrical resistance as they pass through a small orifice. It is suitable for particles ranging from about 0.5 micrometers to 400 micrometers, offering more precision than sieving.
• Light Scattering: Techniques such as laser diffraction or dynamic light scattering can measure particles down to the nanometer range, making it the most suitable for very fine particles.

Considering these ranges, the correct order from largest to smallest measurable particle size is:

1. Anderson Pipette (around 1 micrometer to 100 micrometers)
2. Light Scattering (typically able to measure down to nanometers)
3. Coulter Counter (0.5 micrometers to 400 micrometers)
4. Sieve (down to about 45 micrometers)

Therefore, the correct choice of particle size measurement technique in scoring order of size is ii, iv, iii, i.

This concludes that the correct answer is ii, iv, iii, i, aligning with the given correct answer.