89. How many hours are there in one day?
Answer: B
There are 24 hours in one day.
A standard day consists of 24 hours, which is the accepted measurement of time in a complete rotation of the Earth on its axis.
A) 12
Option A is incorrect because it represents only half of a full day. While there are 12 hours in a half-day period (such as from midnight to noon), it does not account for the full 24-hour cycle.
B) 24
Option B is correct as it accurately reflects the total number of hours in one complete day. This is a universally recognized measurement of time that aligns with the Earth's rotation.
C) 36
Option C is incorrect because it exceeds the total number of hours in a single day. A 36-hour day is not a standard or recognized measurement of time and does not reflect the reality of Earth's daily rotation.
D) 48
Option D is also incorrect as it suggests an even longer duration than a standard day. A 48-hour period would encompass two full days, not just one.
Conclusion
The correct answer is 24 hours, which is the definitive measure of time in one day based on Earth’s rotation. All other options fail to accurately represent this fundamental concept, making Option B the only correct choice.