What does an Island and the letter T have in common?

I know a nine-letter word having only one vowel.
Do you ?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

Can you find out which options fits best with the missing column?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

what one word does the below rebus identifies?

Prove that twice of ten is the same as twice of eleven.

What word is pronounced the same if you take away four of its five letters?