MCQ about Plastic and tiles
Which of the following plastic is recommended for manufacturing floor tiles?
- Alkyd
- Cumarone-indene
- Styrene
- Vinyl
Cumarone-indene
Cumarone-indene: These resins become soft over a narrow range of temperature. Their electrical properties do not change with humidity.
They are brittle and are used for floor tiles, rubber manufacturing, etc.
Important Points:
Some other forms of thermoplastic resins are as follows:
Alkyd: these resins are made from glycerine and phthalic anhydride. They are used for preparing thin films of plastics.
Styrene: These resins are made of ethylene which is made of petroleum. This is useful in electronic and telecommunications industry.
Cumarone-indene: These resins become soft over a narrow range of temperature. Their electrical properties do not change with humidity.
They are brittle and are used for floor tiles, rubber manufacturing, etc.
Important Points:
Some other forms of thermoplastic resins are as follows:
Alkyd: these resins are made from glycerine and phthalic anhydride. They are used for preparing thin films of plastics.
Styrene: These resins are made of ethylene which is made of petroleum. This is useful in electronic and telecommunications industry.
Ring shakes in timber are:
Longitudinal separations in the wood between the annual rings
Shakes
Shakes are nothing but cracks which separates the wood fibres partly or completely. There is a longitudinal separation in the wood between the annual rings.Different types of shakes are:
i) Star Shakes:
This type of shake starts propagating from the bark towards the sapwood and sometimes even towards the heartwood along the lines of medullary rays. Cracks are wider on the outer edge or bark and narrower on the inside.
ii) Ring shakes:
When the crack separates the annual ring completely, it is called ring shakes.
iii) Heart shakes:
heart shakes start propagating from the pith to the sapwood along the lines of medullary rays. Shrinkage of the interior part of the timber causes this crack.
READ ABOUT ROCKS
Rocks
Sedimentary Rocks ⇒Rocks formed by accumulation, compaction, and consolidation of sediments are sedimentary rocks. It is also known as secondary rocks.
Examples: Breccia, Limestone, Sandstone, Shale
Metamorphic Rocks ⇒
Rocks formed due to metamorphism (process responsible for all the changes that take place in an original rock under the influence of changes in the surrounding, conditions of temperature and pressure) are known as metamorphic rocks.
Examples: Quartzite, Marble, Slate, Phyllite, Schist, Gneiss
Igneous Rock ⇒
Rocks formed due to cooling or solidification of magma or lava is known as igneous rocks.
There are two types of igneous rocks:
Intrusive Igneous Rocks →
These rocks are formed due to cooling/solidification of magma within the crust of a planet. It is also known as Plutonic Rock.
Examples: Dike, Sill, Granite, Laccolith, Pegmatite, etc.
Extrusive Igneous Rocks →
These rocks are formed due to cooling/solidification of magma at the crust’s surface. It cools faster than the intrusive one.
Examples: Basalts, Traps, Black Smokers, etc.
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Rocks
