When monkey rotate the gear, which mark will be hit 1 or 2 ?

I am something people love or hate. I change peoples appearances and thoughts. If a person takes care of them self I will go up even higher. To some people I will fool them. To others I am a mystery. Some people might want to try and hide me but I will show. No matter how hard people try I will Never go down. What am I?

What can go up a chimney down, but can’t go down a chimney up?

Can you solve the photo plexer logic ?

What is more useful when it is broken?

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

What is the word or phrase?

Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?

Can you replace the question mark with the correct number?