There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Forwards I am heavy, backward I am not. What am I?

Which digit occurred maximum times between the number 1 and 1000?

What goes up but never comes down?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

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