Q.1.
Plastics which get deformed easily on heating and can be bent easily are known as thermoplastics
Q.2.
Teflon is a special plastic on which oil and water do net stick.
Q.3.
The materials which is not easily decomposed by natural processes is called biodegradable.
Q.4.
Characteristics of synthetic fibres :
Q.5.
The properties of plastic
Q.6.
Which of these is a fibre derived from chemicals?
Q.7.
State if true or false. Plastics are poor conductors of heat
Q.8.
List the 5Rs.
Q.9.
There are two properties of rayon below. Select the two correct properties.
Q.10.
Name the form of polyester which is replacing materials like glass and used for making bottles and jars.
Q.11.
What is the full form of PVC?
Q.12.
What is Ester?
Q.13.
Name a basic component of animal fibres.
Q.14.
Synthetic fibres are synthesised from a raw material called ________.
Q.15.
The uniforms of firemen have coating of __________ plastic to make them flame resistant.
Q.16.
A polymer is a chain of many small units joined together which is called
Q.17.
Artificial wool is called
Q.18.
Which fibre is used to make parachutes?
Q.19.
Terylene + cotton =
Q.20.
Which synthetic fibre is called as an artificial silk?