The more of this there is, the less you see. What is it?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

In the picture below can you find the correct switch that will turn on the bulb?

Readers with high attention to detail can spot the cheater in the exam hall in 5 seconds. Are you one of them? Test your visual skills now!

The more you take me, the more you leave me behind.
Who Am I?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

There is a five-letter word which has 3 consonants(all are same) and 2 different vowels.
Also, something wrong is associated with the word.

Can you name it?

How many letters are in the alphabet?

It can be easily calculated that the digits 0 to 9 can be arranged into 3628800 distinct ten-digit numbers.

But do you know how many of these numbers are prime?