What is the next number in this matchsticks series riddle?

What do you see in the given picture?

If you say my name, I will no longer exist. What am I?

Can you decipher the below rebus?

PBLUESAISNUERSES

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

John was writing his first book. After saving the document, he locked his laptop with a password and mentioned some phrases for the hint box.

A friend of his tried opening his laptop but found out that it was password protected. Following is the hint that appeared.
1 mobile 3 books 2 roars 1 night 4 balls 2 lighters 1 ghost 1 hat 3 watches.

Can you help him in cracking the password?

How can you make number one disappear by adding something to it?

The centre of the third figure is empty. What digit should fit inside?

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

There once were seven dwarfs who were all brothers. They were all born two years apart. The youngest dwarf is seven years old. How old is his oldest brother?