What always comes into a house through the keyhole?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

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

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Who can jump higher than a Mountain?

A person is found murdered in his Chamber. When the crime scene is investigated, the Investigator find out that there is a calendar on which the victim has written a few numbers with his blood. The numbers are 4, 11, 11 and 4.

There are four suspects in the murder, John, Jacob, Anna and Lee. Can you find out who is the murderer?

I went to the bookshop and spent one-half of the money that was in my purse.

When I came out, I found that I had as many cents as I had dollars and half as many dollars as I had cents when I went in. Find the money in my purse when I entered the store.

It begins where the time ends.
Its second is an expression of surprise.
Its third is a question.
Its fourth is urinate.
It ends with a drink.

Which country it is?