All questions of Clock & Calendar for Class 4 Exam

Understanding Leap Years
Leap years are determined by specific rules that govern the Gregorian calendar. A standard year has 365 days, but a leap year has 366 days, with an extra day added in February (February 29).
Rules for Determining a Leap Year
- A year is a leap year if it is divisible by 4.
- However, if the year is divisible by 100, it is not a leap year unless it is also divisible by 400.
Analyzing the Year 2100
- The year 2100 is divisible by 4 (2100 ÷ 4 = 525).
- The year 2100 is also divisible by 100 (2100 ÷ 100 = 21).
- Since 2100 is divisible by 100, we must check if it is divisible by 400.
- 2100 is not divisible by 400 (2100 ÷ 400 = 5.25).
Conclusion
Since 2100 follows the rule where it is divisible by 100 but not by 400, it is not considered a leap year. Thus, the correct answer is option 'B': No, 2100 is not a leap year.
This rule ensures that the calendar stays aligned with the Earth's revolutions around the sun, maintaining accuracy over long periods.

After 7 days, it will be Monday again. Adding 3 more days gives Thursday.

Dividing 25 by 7 gives a remainder of 3. Three days after Friday is Tuesday.

The months with 31 days are January, March, May, July, August, October, and December—7 months in total.

The hour hand between 3 and 4 indicates it is past 3, and the minute hand at 6 represents 30 minutes. The time is 3:30.

Understanding Time Difference
To find the time difference between 3:45 PM and 6:30 PM, we need to break down the hours and minutes.
Step 1: Identify the Times
- Start Time: 3:45 PM
- End Time: 6:30 PM
Step 2: Break Down the Hours
1. From 3:45 PM to 4:00 PM:
- Remaining minutes: 15 minutes (from 45 to 60)
2. From 4:00 PM to 6:00 PM:
- Total hours: 2 hours
3. From 6:00 PM to 6:30 PM:
- Remaining minutes: 30 minutes
Step 3: Combine the Time
- Total Time = Minutes from 3:45 PM to 4:00 PM (15 minutes) + Hours from 4:00 PM to 6:00 PM (2 hours) + Minutes from 6:00 PM to 6:30 PM (30 minutes)
- Calculate the total:
- 2 hours
- 15 minutes + 30 minutes = 45 minutes
Final Calculation
- Total time difference = 2 hours and 45 minutes.
Therefore, the correct answer is option C: 2 hours 45 minutes.
This method of breaking down the time into manageable parts helps in understanding how to calculate time differences effectively.

From 4:25 PM to 6:00 PM is 1 hour and 35 minutes.

Understanding Leap Years
A leap year is a special year in our calendar that occurs every four years. It has an extra day added to it to keep our calendar in alignment with the Earth's revolutions around the Sun.
Why Do We Have Leap Years?
- The Earth takes approximately 365.25 days to orbit the Sun.
- To account for that extra 0.25 days, we add an additional day (February 29) every four years.
How Many Days Are in a Leap Year?
- A standard year has 365 days.
- In a leap year, we add one extra day:
- 365 days (standard year) + 1 day (extra in leap year) = 366 days.
When Is a Leap Year?
- A year is considered a leap year if:
- It is divisible by 4.
- If it is divisible by 100, it must also be divisible by 400 to be a leap year.
- For example, the year 2000 was a leap year, but 1900 was not.
Conclusion
Thus, the correct answer to the question "How many days are there in a leap year?" is option 'C', which states there are 366 days in a leap year. This extra day helps keep our calendar accurate and in sync with the seasons.

From 7:10 AM to 8:40 AM is a difference of 1 hour and 30 minutes.

The hour hand at 9 and the minute hand at 12 means the time is exactly 9:00.

From 11:20 AM to 2:05 PM is a journey of 2 hours and 45 minutes.

Dividing 45 by 7 gives a remainder of 3. Three days after Sunday is Wednesday.

Dividing 18 by 7 gives 4 days extra. Four days after Thursday is Monday.

2020 is divisible by 4, making it a leap year. Leap years occur every 4 years.

At 7:45, the hour hand is slightly past 7, and the minute hand is at 9 (representing 45 minutes).

The hour hand at 12 and the minute hand at 3 represent 15 minutes past 12. The time is 12:15.

In a non-leap year, February has 28 days.

From 9:15 AM to 12:00 PM is a time difference of 2 hours and 45 minutes.

Counting 15 days backward, it was Tuesday.

Leap years occur every 4 years.