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

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

Move four matchsticks to the below square to form three squares?

Katrina wants to go on a date and prefers her date to be tall, dark and handsome.

Of the preferred traits - tall, dark and handsome - no two of Shahrukh, Ajay, Salman and Akshay have the same number.
Only Shahrukh or Akshay is tall and fair.
Only Ajay or Salman is short and handsome.
Shahrukh and Salman are either both tall or short.
Ajay and Akshay are either both dark or both fair.
Who is Katrina's date?

A man is trapped in a room. The room has only two possible exits doors. Through the first door there is a room constructed from magnifying glass. The blazing hot sun instantly fries anything or anyone that enters. Through the second door there is a fire-breathing dragon. How does the man escape?

I am quite hot but become too cold if you remove the first two letters. What am I?

How many words can a pen with half refill write?

What do you get if you add 2 to 100 four times?

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

How many times do a clock's hands overlap in a day ?