Why is Saturday stronger than Monday?

I know a nine-letter word having only one vowel.
Do you ?

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

You’ll find me on Mercury, Earth, Mars, Jupiter, Saturn, and Uranus. But never Neptune, or Venus. What am I?

Out of the nine cats that you can see in the picture, there are only two that are completely identical. Can you find them out?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

Count the number of triangles in the picture below:

On one occasion, A Boy collects 71 rupees in form of 20 paise and 25 paise. He collects a total of 324 coins.

Can you tell me how many 20-paisa and 25-paisa he got?

What English word has three consecutive double letters?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?