2017
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Five-second
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Two-second
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one and half-second
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one-second
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Detailed explanation-1: -In simple words, CSIR-NPL maintains the Indian Standard Time (IST). The time authority by NPL is based on a bank of Cesium (Cs) atomic clocks and a Hydrogen maser. These clocks are so accurate that they would lose or gain one second in about three lakh years.
Detailed explanation-2: -The first leap second was inserted into the UTC time scale on June 30, 1972. Leap seconds are used to keep the difference between UT1 and UTC to within ±0.9 s.
Detailed explanation-3: -A “Leap Second” is added every now and then to Coordinated Universal Time (UTC) in order to synchronize clocks worldwide with the Earth’s ever slowing rotation.
Detailed explanation-4: -The practice of adding leap seconds to clocks started in 1972. Since then, a leap second has been added to UTC whenever the two time systems drift apart by more than 0.9 seconds.