What occurs twice in a week, once in a year but never in a day?

Why do people go to bed?

Which letter of the alphabet has the most water?

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?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

If,

Akriti = 631
Levis = 521
Sroti = 521
Aneel = 533
Then,
Sunil =?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

A four-digit number (not beginning with 0) can be represented by ABCD. There is one number such that ABCD=A^B*C^D, where A^B means A raised to the B power. Can you find it?