A day has how many hours?
A) 12 hours
B) 24 hours
C) 36 hours
D) 48 hours

Hint:A normal year has 365 days. Convert the days into hours. They have asked in the options in terms of hours and not in seconds or minutes. 1 hour = 60 minutes and 1 minute = 60 seconds.

Complete step by step answer:
A day is a time taken by a celestial body to complete one rotation around its axis. On earth day, there are 24 hours. It is just an approximation because the earth day is 23 hours 56 minutes and 4.09 seconds. so it is considered as approximately 24 hours.
A twelve-hour clock shows 12: 00 at midnight and 12: 00 at midday. A 24-hour clock shows from 0: 00 to 23: 59: 59.
We know that AM is any time between midnight and midday and PM is any time between midday and midnight
We call midnight as in a location the time is six hours after sunset and six hours before sunrise .
Basically, on the earth, there are 24 time zones. In every time zone where a clock will show the same time is called Universal time and measured as GMT.
Therefore we can say that in a day there are 24 hours.
Option B 24 hours is the correct option.

Note:
Check whether the question asked is to convert a day into hours or minutes or seconds. Go through the topics like how many times the minute had and secondhand coincide in a single day.