An egg

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Chicken.

Picture frame.

Chess.

He jumped in the window.
He was outside the window
He was a window washer!

The second one.

c and y c(and)y.

16
4 is the square of 2; 9 is the square of 3; 25 is the square of 5; xmust be the square of 4 (16).

11cm

Perimeter of triangle is given by formula;P = X + Y + Z
Substitutes the values
P=X+Y+Z
25=10+4+Z
Rearrange Z+14=25
Z=25-14 Z=11
Therefore the length of third side is 11cm.

You can hang the iron rods on a string and watch which one turns to the north (or hang just one rod).
Another solution: take one rod and touch with its end the middle of the second rod. If they get closer, then you have a magnet in your hand

a sister