The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Name a key which is hardest to turn.

What has hands, but can’t clap?

Prove that the below maths equation is true.

8 + 8 = 91

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

What two things can you never eat for breakfast?

I have Rs.50 and I spend it in the way as below.

A word I know has six letters it contains, remove one letter and 12 remain. What is it?

During which month do people sleep the least?