Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

Why is a river so rich ?

The answer I give is yes, but what I mean is no. What was the question?

Can you name any English verb that becomes its past tense by simply rearranging the alphabets ?

Christina is older than Kareena and Karishma. Katrina is older than Karishma and younger than Kareena. If Kareena has a brother named John, who is older than Christina, who's the youngest?

100 prisoners are stuck in the prison in solitary cells. The warden of the prison got bored one day and offered them a challenge. He will put one prisoner per day, selected at random (a prisoner can be selected more than once), into a special room with a light bulb and a switch which controls the bulb. No other prisoners can see or control the light bulb. The prisoner in the special room can either turn on the bulb, turn off the bulb or do nothing. On any day, the prisoners can stop this process and say "Every prisoner has been in the special room at least once". If that happens to be true, all the prisoners will be set free. If it is false, then all the prisoners will be executed. The prisoners are given some time to discuss and figure out a solution. How do they ensure they all go free?

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?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

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?