What has one letter and starts with an E?

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

Before Mount Everest was discovered, what was the highest mountain in the world?

It is an eleven letter word.
The first, second, third and fourth letters form a banquet's name.
The fifth, sixth and seventh letters form a car's name.
The eighth, ninth, tenth and eleventh letters form a mode of transport.

Can you identify what word it is?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

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

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

What is the riddle which can be asked all day with a different correct answer each time.

I know a nine-letter word having only one vowel.
Do you ?