What is always in front of you but can’t be seen?

What goes up but never comes down?

Can you find the odd one out from the below words ?

First Second Third Forth Fifth Sixth Seventh, Eighth Nine Ten Eleven Twelve.

Can anyone tell me a word in the English dictionary which has a silent 'z'?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

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

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

I have teeth but i don't bite. Who Am I ?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?