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?

What has one letter and starts with an E?

John was going on a jungle trip. He asked his wife to pack something to eat, something to drink and something to burn if he feels cold in the jungle. When John opens the backpack he found just one thing in the bag. What was it?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

If a wheel has 54 spokes, how many spaces are there between the spokes?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

During which month do people sleep the least?

How many letters are in the alphabet?