Which one of the following is measured by a stroboscope ?

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Q: 5 (SCRA/2007)

Which one of the following is measured by a stroboscope ?
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question_subject: 

Science

question_exam: 

SCRA

stats: 

0,10,23,4,3,10,16

keywords: 

{'stroboscope': [0, 0, 1, 0], 'torque': [0, 0, 3, 1], 'frequency': [0, 0, 1, 3], 'pressure': [0, 0, 0, 1], 'temperature': [0, 1, 1, 7]}