An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

What building has the most stories?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

Why Aeroplane windows are round?

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

I look at you, you look at me, I raise my right, you raise your left. What am I?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

The horse jumps over the king.
Strangely there is absolutely no scratch on him.

Can anyone explain, how is this possible?

In a competitive exam, each correct answer could win you 10 points and each wrong answer could lose you 5 points. You sat in the exam and answered all the 20 questions, which were given in the exam.
When you checked the result, you scored 125 marks on the test.

Can you calculate how many answers given by you were wrong?