What is so fragile that saying its name breaks it?

Find the missing letter in the last circle logically in the given below picture.

If an electric train is travelling south, then which way is the smoke going?

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

what does the below rebus mean?

What has many keys but can’t open a single lock?

What Time Should the last watch show in the below figure?

There is an exact a week gap between Christmas and New Year. Hence, It is obvious that the new year that comes right after Christmas comes on the same day of the week.

A Strange thing happened in the Year 1777. Christmas occurs on Wednesday and New Year on Monday. How is that possible?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?