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

John and Jacob are twin brothers. One of them is a liar whereas the other one is a truth-teller.

I called their home number and one of them picked up.
I asked. 'Does John lie?' The person replied with a yes.

Whom did I talk with, John or Jacob?

Get total of 120 by using five zeros 0,0,0,0,0 and any one mathematical operator.
Do you ?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

Move three sticks of the spiral below to form a square.

In a concert, Christina is performing a dance show with her group.
At 10:00, she and her crew were dancing in an absolutely straight line. At that time Christina was standing in 4th position from both the front and back end of the row.

What was the size of her crew?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Known by all without exception, Forever here, for your protection, Sometimes strong, sometimes weak, Right after the night I come - hot and chic. And while millions of miles away, I always get to you, I find my way. No life around could do without me, Can you guess what I might be?