Which rpm falls within the cytocentrifuge speed range of 200-1000 rpm?

• A. 150 rpm
• B. 250 rpm
• C. 1500 rpm
• D. 100 rpm

Answer: (B)

Choosing a value that lies within a defined rpm range is the key idea. For cytocentrifugation, the speed range given is 200 to 1000 rpm. A value within that interval is suitable, while values outside are not. Among the options, 250 rpm sits between 200 and 1000 rpm, whereas 150 rpm and 100 rpm are below the lower limit, and 1500 rpm exceeds the upper limit. Therefore 250 rpm is the correct choice. In practice, staying within this range helps achieve proper cell sedimentation while preserving morphology.