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UKPSC Prelims 2016Paper-IQ. 18 of 250
Q. 181 markMedium
UKPSC Prelims 2016·Paper-I
Which one of the following is NOT a natural unit of time?
(a)Tropical year
(b)Lunar month
(c)Standard time
(d)Day
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Which one of the following is NOT a natural unit of time?