Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

A Car is crossing a bridge 2 miles long. The bridge can only hold 10000 lbs, which is the exact weight of the car. The Car makes it half way across the bridge and stops. A bird lands on the car. Does the bridge collapse? Explain.

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

why number 8549176320 is one of a kind?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

What does this rebus means ?

Count the number of lines in the image below ?

What number divided by 4 is the same as that number minus 4?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E