PowerPoint 1 part 2 Scientific Principles

What three can cause corrosion to plastics?

• Heat

• Dirt

• Oxygen

• Water

• UV

What two can cause corrosion to plastics?

• Bending

• Light

• Chemicals

What type of plastic is commonly used for guttering and can be heated and re-shaped?

• Thermoplastic

• Thermosetting Plastic

What type of plastic can-not be altered by further heating?

• Thermosetting Plastic

• Thermoplastic

Underground mains (blue) is made from which Thermoplastic?

• MDPE (Medium Density Polyethylene)

• HDPE (High Density Polyethylene)

Guttering are made from which Thermoplastic?

• MDPE (Medium Density Polyethylene)

• PVCu

What is the formula for calculating weight?

• Mass / Gravity

• Mass x Gravity

What is the formula for calculating Density?

• Mass / Volume

• Mass x Volume

What is the Density of water?

• 0.5

• 1

• 2

• 4

What is the Density of air?

• 0.5

• 1

• 2

• 4