# 2nd Class Mathematics Time and Calendar

Time and Calendar

Category : 2nd Class

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

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

• 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

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

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:

 Name of the months Number of days January 31 February 28 (Increased by 1 in leap year) March 31 April 30 May 31 June 30 July 31 August 31 September 30 October 31 November 30 December 31

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