Can you find the key in the picture below?

What goes up but never comes down?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

What is red and smells like blue paint?

The doctor prescribed you to take one pill from the bottle every half an hour. The bottle is now left with only three pills.

How long do you think you have before you run out of pills?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What does below chemistry rebus means?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?