I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

Spot 5 differences in two Christmas tree below:

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

In the four images below, can you find the odd one out?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

I have one of the three numbers: 1, 2, or 3 in my mind. I speak only truth. You can ask me just one question for which I will only reply in yes or no or don't know. What question will you ask from me so that you are able to know the number?

I have a head like a cat and feet like a cat, but I am not a cat. What am I?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.

What's a single-digit number with no value?