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UPPSC Prelims 2019CSATQ. 30 of 219
Q. 301 markMedium
UPPSC Prelims 2019·CSAT
Choose the correct meaning of the phrase "Zero hour".
(a)12 o' clock at night.
(b)The hour when an operation begins.
(c)The hour when the sun rises.
(d)The hour when the sun sets.