Can you find out which options fits best with the missing column?

Open a Laptop which is password protected. Hint for the password is given as below:

1 mobile 3 books 2 Boards 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

What can you catch but never throw?

An explorer goes on an exposition in the jungle. He sets up camp in the middle of the jungle. The next morning he sees something with a head and a tail, but he is not afraid. What did he see in his bag?

How many times can you subtract the number two from the number fifty?

Find the next number in the series

12, 20, 40, 72, 116, 172 ?

Can you find a seven digit number which describes itself. The first digit is the number of zeros in the number. The second digit is the number of ones in the number, etc. For example, in the number 21200, there are 2 zeros, 1 one, 2 twos, 0 threes and 0 fours.

What has many teeth, but cannot bite?

Can you find the key in the picture below?