Different lights make me strange by changing me into different sizes. What am I?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

You can see three almost identical images below. Can you spot the odd one out from them?

Remove two matchsticks to make the below equation correct.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

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

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

You can see it everyday, But cannot touch it at will. What is it?

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.