**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 seconds.

- Example:

Convert 5 hours in

(a) 18000 seconds (b) 19000 seconds

(c) 21000 seconds (d) All the above

Ans. (a)

Explanation: 1 hour = 60 \[\times \] 60 seconds = 3600 seconds. So 5 hours = 5 \[\times \] 3600 seconds = 18000 seconds.

Clocks

Clocks are the devices for measuring and indicating time. 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

Ans. (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

Ans. (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

Ans. (a)

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

- Example:

A clock which shows the time in numbers is called:

(a) Analog clock (b) Digital clock

(c) Mechanical clock (d) All the above

(e) None of these

Ans. (b)

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 2017:

- Example:

How many months of the year have 30 days?

(a) 6 (b) 4

(c) 7 (d) All the above

(e) None of these

Ans. (b)

- Example:

Fill in the blank from the options given below.

Sunday _________Tuesday

(a) Saturday (b) Friday

(c) Monday (d) All the above

(e) None of these

Ans. (c)

*play_arrow*Time and Calendar*play_arrow*Introduction*play_arrow*Hours, Minutes and Seconds*play_arrow*Clocks*play_arrow*Calendar*play_arrow*Time and Calendar

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