What can you catch but never throw?

If an electric train is travelling south, then which way is the smoke going?

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

I look at you, you look at me, I raise my right, you raise your left. What am I?

You can see it everyday, But cannot touch it at will. What is it?

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

What does this Rebus Picture means ?

Can you decipher the following common phrase?

T M C
A U O
H S M
W T E

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?