What is the next shape from answers A, B, C, and D figure?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

Suppose you are sitting in an interview and the interviewee asks you an aptitude question.

You have three buckets with a capacity of 4 litres, 8 litres and 10 litres and you have a large tank of water. Now you have to measure 3 litres of water precisely using those buckets. How will you do it?

A man dies of old age on his 25 birthday. How is this possible?

What does it mean?

What has many keys but can’t open a single lock?

Alpha is Beta's sister.

Gamma is a Beta mother.

Delta is Gamma's father.

Tango is Delta's mother.

Then,

How is Alpha related to Delta?

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

What does a man do only once in his lifetime, but women do once a year after they are 29?

Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks.