Yesterday I fell from 30 feet high ladder but I don't get hurt. Why?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

The LCD device should be able to tell the right time in the format HH:MM: SS in a 12-hour format. You can refer to the picture to get an idea. The device is a simple "level indicator" which has to be converted into a watch. How will you program it to work?

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

We have shown you a regular water barrel as below. Without using any measuring device can you check if the barrel is more than half-filled or less than half-filled?

Can you make four (4) nines (9) equal 100?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

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

French Police inspects a room where there are no windows, no doors, no tables and is almost empty expect there is just a puddle of water. They found a dead man who obviously hung herself from the ceiling, but they are not able to figure out how this had happened.

John and Jacob entered the crime scene and easily able to solve the case.

How did the man die?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?