What is so fragile that saying its name breaks it?

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?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

What does below rebus means ?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

The world's largest Thanksgiving turkey was on display at a fair. Everyone was admiring it when suddenly a woman ran up and shot the turkey and left. Everyone knew her yet nobody made any attempts to stop or report her. Why?

I cannot talk, but I always reply when spoken to. What am I?