I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Which Burger Is Different in below image?

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?

What breaks yet never falls, and what falls yet never breaks?

What word begins and ends with an E, but has only one letter?

What is more useful when it is broken?

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.

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?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

I’m tall when I’m young, and I’m short when I’m old. What am I?