What does does this rebus picture means ?

Can you find the key in the picture below?

Which tank will fill first?

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

From a pack of 52 cards, I placed 4 cards on the table.

I will give you 4 clues about the cards:

Clue 1: Card on left cannot be greater than the card on the right.
Clue 2: Difference between the 1st card and 3rd card is 8.
Clue 3: There is no card of an ace.
Clue 4: There are no face cards (queen, king, jacks).
Clue 5: Difference between the 2nd card and 4th card is 7.

Identify four cards?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

What 5-letter word typed in all capital letters can be read the same upside down?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

Can you name some countries which do not have the alphabet 'A' in them?