Earliest time piece in record

Q. The earliest clocks made by Egyptians in year 800 BC for measuring time was :

Q. Which of these can only measure time interval and not the time of day?

(a) sand clock
(b) sundial
(c) pendulum clock
(d) quartz clock

Q. What will be the time by a 24-hour clock, if the time by your watch is 9 O' clock in the evening?

Q. Set the time in the analog clock by matching the time shown in the digital watch.

Q.

Two clocks are set to show the correct time at 1:00am on a day. One clock loses 3 minutes in an hour and the other clock gains 3 minutes in an hour. Exactly after how many days will both the watches show the correct time? Assume that is a 12 hour clock.