Discussion
Match each machine in List I with the property it exploits in List II.
List I
A. Indented cylinder
B. Aspirator
C. Gravity table
D. Spiral separator
List II
1. Terminal velocity
2. Length
3. Shape and rolling behaviour
4. Density
Select the correct match.
Answer: B
Correct answer: A-2, B-1, C-4, D-3
Four machines and four different physical properties. The indented cylinder works on length, lifting short particles out in its pockets. The aspirator works on terminal velocity. The gravity table works on density, stratifying a fluidised bed. And the spiral separator works on shape and rolling behaviour, throwing round seeds outward while flat ones slide.
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