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

Can you decipher the below rebus?

PBLUESAISNUERSES

There are hundred red gems and hundred blue gems. The blue gems are priceless while the red gems equal wastage. You have two sacks one labeled Heads and the other Tails. You have to distribute the gems as you want in the two sacks. Then a coin will be flipped and you will be asked to pick up a gem randomly from the corresponding sacks.

How will you distribute the gems between the sacks so that the odds of picking a Blue gem are maximum?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Akbar called Birbal and asked him to draw a line on the floor. He asked Birbal to make that line smaller without erasing it. Birbal smiled and did it before Akbar could blink his eyes.

How did he managed to do it?

Can you solve the below tricky visual equation?

How many words can a pen with half refill write?

Client Dempsey living in one of the East Coast states of the U.S. was talking to Landon Donovan, who was living in the West Coast state of the U.S.

Dempsey: What time is it?
Donovan: Wow, It is the same time here.

How is this possible?