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?

If two's company, and three's a crowd, then whats four and five ?

What occurs twice in a week, once in a year but never in a day?

What common phrase is represented by the below lines

Easy going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Medium going:
Weak, 'I'm going.'
Tough, 'I'm staying.'

Tough going:
Weak, 'I can't do it, I'm staying!'
Tough, 'Let's get going.'

Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

Decode this picture on T-Shirt and tell what it says ?

You have two buckets of 11 liters and 6 litres.
How can you measure exactly 8 litres?

You board a train. The train will have to enter a tunnel soon. You are claustrophobic. Which place is the best for you to sit?

What you cannot hold but it is yours?

Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?