What is stroboscope?

Q.  Which of the following statements is true about stroboscope?
- Published on 11 Sep 15

a. Stroboscope is non-contact type frequency instrument
b. Stroboscope can measure frequency upto 5 Hz
c. Stroboscope uses electromagnetic radiations to measure frequency
d. All of the above

ANSWER: Stroboscope is non-contact type frequency instrument

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