You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

When monkey rotate the gear, which mark will be hit 1 or 2 ?

Different lights make me strange by changing me into different sizes. What am I?

What is the word or phrase?

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?

You are given 2 eggs.
You have access to a 100-storey building.
Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor, Both eggs are identical.
You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

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

Women do it once a year after they turn 19 but men get to do it only once in a lifetime. What is it?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.