Question : There are some plastics when moulded once, cannot be softened by heating. These are called:

Option 1: Thermosetting polymers

Option 2: Polyvinyl chloride

Option 3: Thermoplastic polyurethanes (TPU)

Option 4: High-density polyethene (HDPE)

Question : Which of the following is used to make lightweight but strong plastic?

Option 1: Nylon

Option 2: Polythene

Option 3: Polyvinyl chloride

Option 4: Methyl methacrylate

Question : Which of the following is not a characteristic of a solid?

Option 1: High compressibility

Option 2: High density

Option 3: Regular shape

Option 4: High rigidity

Question : Saltpetre is another name for ______.

Option 1: sodium chloride

Option 2: potassium nitrate

Option 3: potassium chloride

Option 4: sodium hydroxide

Question : Which of the following Statements is false?

Option 1: Polystyrene was discovered in 1839 by Edward Simon.

Option 2: It is used for making plastics and CD cases.

Option 3: It is not biodegradable.

Option 4: None of these

Question : Which of the following is the main compound of voter ink?

Option 1: Silver nitrate

Option 2: Ammonium chloride

Option 3: Silver chloride

Option 4: Ammonium nitrate