If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

What's the only room from which no one can enter or leave

If in a code language, DISTANCE is written as IDTUBECN and DOCUMENT is written as ODDVNTNE, the how will THURSDAY be coded as in the same language?

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?

If you say my name, I will no longer exist. What am I?

What breaks yet never falls, and what falls yet never breaks?

As shown in the image, the nine Dogs are square fenced. By constructing just two square fences can you make sure that two Dogs cannot meet each other without crossing the fence?

Two brothers were watching a horror film on video late one night. One brother dozed off and dreamed that he was being chased by the crazy man from the movie, who was trying to kill him. In the dream, he hid in a cupboard. There was no sound except his heart pounding, and he had no idea where his crazed captor was. He was terrified! At that moment, the video finished, and his brother put his hand on the shoulder of his sleeping sibling to wake him. The shock at that tense moment was enough that the sleeping brother suffered a massive heart attack and died instantly. True or false?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?