Ceramics consist of
Explanation: Ceramics consists of ionic and covalent bonds only.There is no hydrogen compound so no case of H boding.
All ceramics contain clay.
Explanation: No this may sound convincing but all ceramics don’t contain clay.
The densities of ceramics are low.
Explanation: In ceramics, different oxides and carbides are not compactly bonded.
There are small voids in ceramics structure.
Explanation: Compounds are less compactly bonded and hence voids are formed.
Which of the following properties are true for ceramics.
Explanation: Properties of ceramics.
Paraffin wax is represented by
Explanation: Paraffin wax in a semi solid stage is represented by C18H38.
A thermoplastic material has a linear polymer chain while a thermosetting plastic has a crosslinked polymer chain.
Explanation: Given statement is true thats why thermoplastic can be remoulded while thermosettings can’t be.
Which of the following is a thermosetting polymer?
Explanation: a), b) and c) consist of linear structures while polyester consists of cross linked and hence is a thermosetting polymer.
Teflon has very high coefficient of resistance.
Explanation: Teflon is very smooth and has coefficient of friction as low as 0.04.
Viscoelastic materials at low temperatures show no change in its strain with change in stress.
Explanation: Viscoelastic materials follow Hooke’s law at intermediate temperatures.