What is the SI base unit used to measure time?

Explanation

The second is the SI base unit used to measure time, and it is now precisely defined based on a specific, extremely stable property of cesium atoms, rather than any astronomical reference, allowing for extraordinarily accurate timekeeping. This modern atomic definition replaced older definitions that were based on Earth’s rotation or orbit, which are not perfectly regular over very precise timescales. Nearly all other common units of time, including minutes, hours, and days, are simply defined as specific multiples of this fundamental base unit. Explore more Everyday Science MCQs on mcqstutor to keep practicing.