Which subsampling method involves collecting a sample at a single point in time?

• A. Grab sampling
• B. Coning and quartering
• C. Splitters
• D. Rotational traversing cut

Answer: (A)

Grab sampling is about taking a sample at a single point in time to get a quick snapshot of what the material looks like right then. It’s useful for fast checks or process monitoring when the material is relatively uniform at that moment, but it may miss changes that occur over time or across the batch, so it isn’t always representative of the whole lot. Other methods are designed to account for variability by averaging across portions or across a cross-section, rather than just capturing one instant. That’s why collecting a sample at a single moment best fits the concept of grab sampling.