1. Rubber wood is eco-friendly and easily available.
a) True
b) False
Explanation: Unlike other trees have grown solely for timber purpose, rubber tree provides latex also. After 25-30 years, its latex yields become lower and they are felled. They are replanted after that.
2. Synthetic rubber is also called:
a) Gum rubber
b) Caoutchouc
c) Buna-S
d) Gum elastic
Explanation: It is sold under different names. Some of them are neoprene, buna-s, hypalon, silastic, etc. Gum rubber, caoutchouc and gum elastic are names used for natural rubber.
3. Which of the below adhesive is not attacked by water?
a) Starch glue
b) Albumin glue
c) Vegetable glue
d) Rubber glue
Explanation: Albumin glue is better quality glue and is used for furniture. Starch glue and Vegetable glue is not water resistant.
4. The process of applying an adhesive is:
a) Speedy
b) Slow
c) Costly
d) Cumbersome
Explanation: Adhesive is used to join two surfaces, forming a strong bond between them. It is easy, economic and fast to apply
5.Nitrocellulose glue is prepared from:
a) Pyridine
b) Benzene
c) Pyroxylin
d) Resin
Explanation: Pyroxylin is a nitrated cellulose. It is derived by treating cellulose with a nitric acid. It produces films which adheres to a glass surface.
6.Which of the following glues is used to join light metals?
a) Metal glue
b) Cycle weld
c) Araldite glue
d) Special glue
Explanation: Special glue is used to join metals in general. Cycle weld is used to join aluminium sheet and araldite glue is used to join light metals.
7. Epoxy adhesives are used in the manufacturing of:
a) Glass
b) Fabric
c) Plywood
d) Plastic
Explanation: Epoxy adhesives can cure fast and bonds concrete surfaces as well. They can be used in automobile, aircraft and plywood manufacturing.
8. Which IS code gives details about tile adhesives?
a) IS 14458
b) IS 15477
c) IS 15478
d) IS 14557
Explanation: Adhesive specifications to be used when laying ceramic tiles and mosaics are given in IS 15477
9. Which of the below glue can be made plastic again by re-heating?
a) Thermo-setting
b) Rubber glue
c) Animal protein glue
d) Thermo-plastic
Explanation: Glue from synthetic resins can be either thermo-setting or thermo-plastic. The thermo-setting one is permanent in nature. Thermo-plastic glue can be reheated and made plastic again.
10. Which glue can bond a metal to wood?
a) Contact cement
b) Super glue
c) PVC cement
d) Gorilla glue
Explanation: First the metal is cleaned and filed using sand paper. It is done to make it rough for the adhesive to grip onto. Then adhesive is applied to both surfaces and pressed. Super glue is used for porcelain to porcelain; PVC cement for plastic to plastic and gorilla glue for wood to wet wood.