How is a fly different from a mosquito?

Who can jump higher than a Mountain?

What does this rebus riddle means ?

What Time Should the last watch show in the below figure?

What goes up but never comes down?

A detective visits his friend John just to discover that John's neighbour Dr Jacob was murdered. Dr Jacob, who is a mathematician wrote the murderer's name in a code word "Hcqtfz". There were five suspects
1. Ajit
2. Pankaj
3. Ganpat
4. Deenu
5. Hariya

The Detective was instantly able to find the murderer.
Can you?

What am I?

Can you tell a 3D object that has just two surfaces?

I organized a small get together at my home.
In the party , i have a barrel with some whiskey in it.

Suddenly Guest 1 say 'I bet this barrel of whiskey is more than half full'.
'No, it's less than half full' Guest 2 replied.

I don't have any measuring instrument and without removing whiskey from it , how can i determine which of the guest is right ?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?