Can anyone tell me a word in the English dictionary which has a silent 'z'?

Can you divide the below-given shape into four equal and identical pieces?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

What four weights can be used to balance from 1 to 30 pounds?

Solve the following series:
AZ, GT, MN, __, YB

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

What question can you never answer yes to?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?