What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

People put me on the table and cut me but do not eat me. What am I?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

You find yourself in a strange place guarded by two guards.One of the guard always say truth while other always lies.You don't know the identity of the two.You can ask only one question to go out from there. What should you ask?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

You walk into a room and see a bed. On the bed, there are two dogs, five cats, a giraffe, six cows, and a goose. There are also three doves flying above the bed. How many legs are on the floor?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Why are televisions attracted to people?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?