UPSC Prelims 1998·GS1·science-and-technology·science and technology

An accurate clock shows the time as 3.00. After hour hand has moved 135°, the time would be

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Last updated 23 May 2026, 3:31 pm IST
  1. A7.30Correct
  2. B6.30
  3. C8.00
  4. D9.30

Explanation

To solve this, we determine the rate at which the hour hand moves. A clock is a circle of 360 degrees representing 12 hours. Therefore, the hour hand moves 30 degrees every hour (360 divided by 12). If the hour hand moves 135 degrees, we divide 135 by 30 to find the elapsed time. 135 divided by 30 equals 4.5 hours, which is 4 hours and 30 minutes. Starting from 3.00, adding 4 hours and 30 minutes brings the time to 7.30. Thus, option A is correct.
science-and-technology: An accurate clock shows the time as 3.00. After hour hand has moved 135°, the time would be
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