Can you start the fire using two pieces of wood?

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?

What does below pictogram mean?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

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

Through your logical capabilities, can you make 7 an even?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Can you place six X (crosses) in below board without making three in a row in any way ?

How many Watermelons are there in the below picture?