An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

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

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

What kind of tree can you carry in your hand?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

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.

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

A large container is kept in open under the rain. Every passing hour, the water collected inside the container becomes double what it was.

In ten hours, the container is filled completely. Can you calculate how long would it have taken to be filled in half?