What brings you down but never up?

A Child was born in Lahore, Pakistan.

Still child is not a Pakistani citizen.why ?

How many words can a pen with half refill write?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

You walk into an old horror house. It has no power or plumbing. Once inside, you see three doors. Each door has a number on it. Behind each door is a way for you to die. Behind door number one, you die by getting eaten by a lion. Behind door number two, you die by getting murdered. Behind door number three, you die by an electric chair. You can’t turn back, so you have to go through a door. Which door do you go through?

Prove that twice of ten is the same as twice of eleven.

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?