2nd Class Mathematics Calendar Time and Calendar

                                                                 Time and Calendar

Hours, Minutes and Seconds

Hour, minute and second are the unit for the measurement of time

24 hours = 1 day;

1 hour= 60 minutes;

1 minute = 60 seconds;

Hence, 1 hour\[=60\times 60=3600\,\sec onds\].

• Example:

Convert 5 hours in seconds.

(a) 18000 seconds                       (b) 19000 seconds

(c) 21000 seconds                      (d) All the above

Answer (a)

Explanation: \[1\,hour=60\times 60=3600\,\sec onds\].

So\[5\,hour=5\times 3600\,\sec onds=18000\,Seconds\]

Clocks

Clocks are the devices that let us know of the times in a day. See the examples given below:

The small hand in a clock is for hour and the big hand is for the measurement of minute.

Example:

Hour hand of a clock is at 3 and minute hand is at 4 then the time will be:

(a) 3 : 20                                   (b) 3 : 50       

(c) 3 : 10                                   (d) All the above

(e) None of these

Answer (a)

• Example:

In how many rotation of hour hand of a clock complete 12 hours?

(a) 2                                          (b) 1           

(c) 60                                        (d) All the above

(e) None of these

Answer (b)

Explanation: Hour hand of a clock complete one rotation in 12 hours.

Digital Clocks

The clocks that shows the time in numbers are called digital clocks. Given below are the examples of digital clocks.

• Example:

A man walks 2 hours 20 minutes in the morning and 1 hour 30 minutes in the afternoon. Find the total hours he walks in a day.

(a) 3 hours 50 minutes                 (b) 3 hours 40 minutes

(c) 2 hours 20 minutes                 (d) All the above

(e) None of these

Answer (a)

Explanation: 2 hour 20 minutes + 1 hour 30 minutes = 3 hours 50 minutes.

Calendar

Calendar is the systematic arrangement of dates and months of the year. There are 12 months in a year.

The following are the name of the months and their number of days:

Look at the given calendar of the year 2018:

Example:

How many months of the year have 30 days?

(a) 6                                           (b) 4

(c) 7                                           (d) All the above

(e) None of these

Answer (b)