You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

How many letters are in the alphabet?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Do You See It?

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"

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

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

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?