What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

81 x 9 = 801. What must you do to make the this equation true?

You can hear me, but you can't touch or see me.

What am I?

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What colour are the stairs?

In the picture, you can see a chess board. On the top left position, the K marks a knight. Now, can you move the knight in a manner that after 63 moves, the knight has been placed at all the squares exactly once excluding the starting square?

What does this rebus means ?

PROG WORKRESS

Count the number of triangles in the below picture?

Can you count the number of triangles in the picture below?

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

How can you throw a ball as hard as you can and have it come back to you even if it doesn't hit anything there is nothing attached to it and no one else catches or throws it.