1.Wood that has not been seasoned is also called:
a) Sap wood
b) Fresh wood
c) Heart wood
d) Green wood
Explanation: Green wood usually indicates wood that freshly cut. If not seasoned, it is called green wood. Very rarely green wood is sold in markets.
2.Before peeling in the production of plywood, what has to be carried out?
a) Conditioning
b) Seasoning
c) Debarking
d) Sorting
Explanation: Plywood is made by pressing plys of wood. To peel wood, it must be soft. Conditioning involves exposing wood to moisture by soaking in hot water or live stream.
3. Wax or paint is applied to end-grain of lumber to be air dried, in order to seal the ends.
a) True
b) False
Explanation: To ensure uniform drying of lumber, end-grains are waxed or painted. They slow down drying rate of extremities.
4. The carbon content of steel is:
a) Less than 0.15%
b) 2% – 4%
c) 0.08%
d) 0.002% – 2.1%
Explanation: Cast iron contains 2-4% of carbon, wrought iron contains less than 0.15% of carbon and stainless steel contains maximum 0.08% carbon.
5.When carbon contents less than 0.1%, steel is called:
a) Mild steel
b) Medium carbon steel
c) Dead steel
d) Hard steel
Explanation: Mild steel contains carbon up to 0.25%. Medium carbon steel has 0.25%-0.7% carbon. Hard steel has 0.7-1.5%.
6. Very low carbon steel is used for:
a) Wires
b) Wire nails
c) Screw drivers
d) Rods
Explanation: Since it has very low carbon contents, that is 0.05-0.1% it can be used for low strength works.
7. What property does steel impart to an R.C.C. structure?
a) Compression and tension
b) Tension
c) Shear
d) Compression
Explanation: Concrete and steel are primarily used in R.C.C – reinforced cement concrete. Concrete is strong in compression and weak in tension. Steel is strong in both properties and hence provides strength to the structure.
8.Which of the below is not an ISI classified channel section?
a) ISLC
b) ISJC
c) ISHC
d) ISMC
Explanation: ISLC stands for Indian Standards Light Channel. Similarly, there are Junior (J), Medium (M) and Special (S) Channels. There is no heavy (H) Channel.
9. What is the full form of TMT bars?
a) Thermo Modified Treated
b) Thermo Mechanically Treated
c) Thermal Mechanic Twisted
d) Thermo Mechanically Twisted
Explanation: TMT bars are produced by sudden quenching of red hot steel bars by spraying water. Hence it is called Thermo Mechanically Treated bar.
10. Corrugated sheets are also referred to as:
a) CS Sheets
b) CI Sheets
c) GC Sheets
d) GI Sheets
Explanation: The corrugated sheets are galvanized to add a protective coating to the steel sheet. Hence, GI-Galvanized Iron sheet is another name for corrugated sheets.