How many Thursdays are there in the month of August?

If some year (which is not a leap year) first day is Sunday, then what will be the last day be of that year?

If this is the year $2004$. How many years ago was the refrigerator invented$?$

Write the months in which there are five Thursdays$?$

Answer in one word.

It is used to know about days, weeks and months.

Answer the following on the basis of the calender of $2002:$

On which day, does the month November end?

Prabhat remembers that his mother's birth day falls after ${17}^{\mathrm{th}}$ April but before ${21}^{\mathrm{st}}$ April. His sister Urmila remembers that her mother's birth day falls after ${19}^{\mathrm{th}}$ April but before ${24}^{\mathrm{th}}$ April. What is the exact date on which his mother's birth day falls?

The cycle was invented $49$ years before the petrol car. When was the bicycle invented$?$ 

The ballpoint pen was invented $54$ years after the fountain pen. When was that$?$

Which month has the least number of days$?$

On which date and day does January end $?$

Look at the calendar for the year $2018$ and circle the below mentioned dates in the calendar.

 $26\mathrm{th}$ January, $14\mathrm{th}$ November, $31\mathrm{st}$ December.

Is there something special about these dates$?$

Alexander Graham Bell invented the telephone in $1876$. How many years ago was that, if this is the year $2004$.

How is time measured? Name the unit for measuring time.