What does this simple rebus mean?

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

Which number should replace the question mark?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

Find the hidden panda in the image below.

Manish has to secure 40% marks to pass his B.tech final exams.
He got just 40 marks and failed by 40-marks.

What is the maximum marks?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

I am the one who remains awake when you sleep. But I need to rest when you awake. Who Am I?

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?