How can one talk without saying a single word?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

Before reading ahead, you must know the fact that only one of the people here is telling the truth.

A says that B is lying.
B says that C is lying.
C says both A and B are lying.

Can you find out who is speaking the truth?

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

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

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

There was a minor accident with a doctor's son but the doctor noticed no major injury. After the treatment, the father of that doctors son is sitting with the son of the doctor without the doctor being in the room.

How can this be possible?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?