What has to be broken before you can use it?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

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?

John enters a small room. The Door Closes.
When the door opens, John is in a larger room.

Explain?

Solve the puzzle by telling what does below picture means.

What kind of tree can you carry in your hand?

Outside a tattoo artist's shop, there was a signboard which read 'I make tattoos on only them who do not tattoo themselves'.

Reading it what do you think, does the tattoo artist tattoo himself?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Identify the 10 differences between the two given pictures.