When my father was 31 I was 8. Now he is twice as old as me. How old am I?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

What does this mean?

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A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

What does this simple rebus mean?

I am lying and I always lie. Tell me whether I am lying or telling the truth.

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

What breaks yet never falls, and what falls yet never breaks?