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

Before Mount Everest was discovered, what was the highest mountain in the world?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

1. What does:
TIM JOB
represent?

2. What does:
MO_ _
represent?

What does this rebus means ?

PROG WORKRESS

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

Can you make a six-letter word using the letters N, A and B ?

What brings you down but never up?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?