What is both possible and impossible at the same time?

During an interview, the interviewer ordered hot coffee for the candidate to relieve the stress. The coffee was kept before him. After a minute, the interviewer asked him, 'What is before you?' He replied 'Tea'.

The candidate was selected immediately. Why?

Can it be possible to build a house that has all its four walls facing towards the South?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

Why do people go to bed?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

I am an odd number. Take away a letter and I become even. What number am I?

Can you count the number of triangles in the picture below?

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.