Modern Material and Chemicals Flashcards
Porcelain is made for making crockery which is itself being prepared by:
ClaY
Ceramics bear properties of:
(a) High melting and boiling point
(c) Chemically unreactive
hard
Materials which can retain their strength above 550°C are known as
Ceramics
Synthetic Polymers?
Plastic
poly means
Meros mean
many
Parts
Bakelite is a good:
Insulator
Natural substances made up of long molecules are:
Rubber and Wool
Long chains of atoms are linked by:
Carbon
________is a synthetic fibre used for making woollen clothesd
Acrylic
Synthetic fibres are made using________as raw materials.
Petrochemicals
Fibre obtained by chemical treatment of wood pulp is called
Rayon
Nylon is obtained by _
Mixing coaL air and water
_________is polyester used for making bottles, utensils, films
PET
Three dimensional molecules with cross links are formed in the case of a
Thermosetting plastic
If a substance such as heavy metals, pesticides accumulates in a body for a long time, it
will be:
(a) Passed out through egestion
(c) Become insoluble in water
(d) Passed on to next consumer in food chain
(d) Passed on to next consumer in food chain
Pests may be not be destroyed through:
(b) Passed out through excretion
(a) Vaccine Insecticides (c) Herbicides (d) Pesticides
Vaccine
Pesticides designed to kill birds are called
Avicides
Primrary soil macro nutrient are
Potassium
Nitrogen
Phosphorus
