Why is Saturday stronger than Monday?

What's the only room from which no one can enter or leave

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Spot 5 differences in two Christmas tree below:

Which is Odd One Out and why?

4377

3954

9862

8454

9831

See the given image carefully. What you have to do is move the blue checkers in the position of the black checkers and vice versa. You are only allowed to move the checker to an adjacent empty space. Do it in the least possible moves.

Can you start the fire using two pieces of wood?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

What is the next shape from answers A, B, C, and D figure?