What is a Polaroid ? State its two uses.

What is polaroid?

What are Polaroids?

What is a geostationary satellite? State its two uses. OR What is a communication satellite? Give any two of its uses.

Polaroid are used

What is an amalgam ? State its use with an example.

What is a fixed pulley ? State its one use.

What is amniocentesis ? State two uses of amniocentesis.