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?

Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

Can it be possible to build a house that has all its four walls facing towards the South?

Can you spot what's wrong with the following sentence?

PETER WAS ANGRY AT
HIMSELF BECAUSE HE
ACCIDENTALLY LEFT THE
THE KEYS TO HIS CAR
AT HIS FRIEND'S HOUSE.

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

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

How many letters are in the alphabet?