A high school has a strange principal. On the first day, he has his students perform an odd opening day ceremony:

There are one thousand lockers and one thousand students in the school. The principal asks the first student to go to every locker and open it. Then he has the second student go to every second locker and close it. The third goes to every third locker and, if it is closed, he opens it, and if it is open, he closes it. The fourth student does this to every fourth locker, and so on. After the process is completed with the thousandth student, how many lockers are open?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?

You are given 2 eggs.
You have access to a 100-storey building.
Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor, Both eggs are identical.
You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

I have some blue and red sock in my drawer. I have a total of 4 socks. I pick 2 socks and the chance that I get a pair of red socks is 1/2.

What is the chance of picking a pair of blue socks?

Can you place six X (crosses) in below board without making three in a row in any way ?

What does an Island and the letter T have in common?

I have branches, but no fruit, trunk or leaves. What am I?

Do you know who was buried in John's tomb?