Before Mount Everest was discovered, what was the highest mountain in the world?

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?

If,

A = 1

B = 2

C = 3

...

...

Z = 26.

Based on above rule, you need to find an eleven letter word whose letter sum is equal to 52.

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Why 1729 is a magic number? Answer Logically.

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?