I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

What does it mean?

You knock a Table over in the library, and suddenly 20 eyes are looking at you.

There are six people in a family namely M, N, O, P, Q and R.

R and O are brother and sister.

N is the brother of Q's husband.
P is the father of M and grandfather of R.

How many male members are in the family?

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

The more it dries, the wetter it becomes. Can you tell what it is?

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

I have feet, but no legs. Which animal Am I?

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.