Can you find out the smallest number that can be conveyed as the sum of three squares in three unique ways?

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?

Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

A 52% bias toss for head using the 51% tail bias coin was done to obtain a fair result.

Can you find how bias is the floor in this case?

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?

If,
29 - 1 = 30
9 - 1 = 10
14 - 1 = 15

Based on similar logic, Can you prove that the below algebraic equation is true?
11 - 1 = 10 ?

By what process could you make a 'Tea-Table' into food?

What has one eye, but can’t see?

What runs around the whole yard without moving?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?