What you cannot hold but it is yours?

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

How many letters are in the alphabet?

What do you see in the given picture?

Can you count the number of matches in the picture below ?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

Can you write down eight eights so that they add up to one thousand?