Question 1 :
Identify the product based on the given features.
I. It is a man-made product.
II. It has a linear arrangement of monomer units.
III. It is used for making goods like toys, combs, containers, etc.
Question 3 :
A polymer is a large molecule composed of many repeated units. What is a polyester composed of?
Question 4 :
Which of the following material is a mixture of two fibres?
Question 7 :
One of the advantages of nylon over rayon is that nylon:
Question 9 :
Fibres of _______ resemble that of silk and hence, it is popularly known as ‘artificial silk’.
Question 10 :
Firefighters’ uniform is coated with a plastic that is fire resistant. Identify the plastic from the given options.
Question 11 :
Identify the type of plastic that can best be used to make electrical switches.
Question 12 :
Modern non-stick cookware and the flat end of an electric iron has a coating of a polymer. Identify the name of the polymer.
Question 18 :
Assertion: Acrylic fibres are used in making socks and shawls.
Reason: Acrylic fibres are a replacement or woolen fibres.
Question 34 :
A chain of small chemical units combined to form a large single unit is called ___..
Question 35 :
A chain of small chemical units combined to form a large single unit is called ___..
Question 37 :
Plastics which when moulded once, cannot be softened by heating. Such plastics are called ____
Question 43 :
Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant.
Question 44 :
The coating on modern non- stick cookware and electric iron is of.
Question 45 :
Clothes we wear are made up of thin strands called ……………..
Question 46 :
Raw materials for preparation of synthetic fibres are obtained from substances like …………….. , …………….. and ……………..
Question 47 :
…………….. are made up of small repeating units, joined together through bonds in linear pattern.
Question 49 :
………….. is the property of materials by which they can be moulded into any shape.