Question : Lens is made up of:

Option 1: Pyrex glass

Option 2: Flint glass

Option 3: Ordinary glass

Option 4: Cobalt glass

Question : Heat resistant variety of Glass is ____.

Option 1: Pyrex glass

Option 2: Haed glass

Option 3: Flint glass

Option 4: None of these

Question : The polymer used in making plastic crockery is 

Option 1: Decron

Option 2: Nylon

Option 3: Backelite

Option 4: Melamine

Question : Which of the following is a mettalic ore?

Option 1: Mica

Option 2: Quartz

Option 3: feldspar

Option 4: Galena

Question : Which of the following metals (shown by its symbol) is generally used for making filament of bulbs?

Option 1: Fe

Option 2: Au

Option 3: Ag

Option 4: W