What is common among 11, 69, and 88?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

Look at the picture and find out which square is not linked with any of the other squares.

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

10 people came into a hotel with 9 rooms and each guest wanted his own room. The bellboy solved this problem.
He asked the tenth guest to wait for a little with the first guest in room number 1. So in the first room, there were two people. The bellboy took the third guest to room number 2, the fourth to number 3, ..., and the ninth guest to room number 8. Then he returned to room number 1 and took the tenth guest to room number 9, still vacant.
How can everybody have his own room?

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

Out of four images which one is the odd one out?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

Which is faster, Heat or Cold ? Explain.

What does it mean?