This set of Basic Civil Engineering Multiple Choice Questions & Answers (MCQs) focuses on “PVC”.
1. Modifying properties of PVC is called:
Explanation: Properties of PVC resins can be altered by adding certain additives to it. This process is called compounding. It is thus possible to attain rigid PVC products.
2. PVC is widely used to make pipes because:
a) Cost effective
b) Does not react to chemicals
c) Easily available
d) Easy to transport
Explanation: PVC is resistant to attack by kerosene oil, acid and chemicals. It is water proof too. Hence it is widely used for pipe manufacture for carrying sewage and rain water.
3. In how many forms does PVC come?
Explanation: The 2 forms are rigid (RPVC) and flexible PVC. RPVC is used in construction of pipes, bottles, cards, etc. Flexible PVC is used in cables, wires, inflatable products, etc.
4. RPVC can be made softer and more flexible using:
Explanation: Addition of plasticizers makes RPVC softer and more flexible. Most commonly used form is phthalates.
5. What is the Limiting Oxygen Index (LOI) of PVC?
a) 45 or more
b) 20 or more
c) 45 or less
d) 20 or less
Explanation: Limiting Oxygen Index is minimum concentration of oxygen that will support combustion of a polymer. It is expressed as percentage. PVC has good flame retardancy. Air has 20% oxygen, PVC has LOI of 45% or more.
6. Flexible PVC is used for:
b) Partition walls
d) Door frames
Explanation: It is inexpensive, attractive and durable as a flooring material. It is possible to print 3D designs on to this and protect it using a clear wear coat. The tough surface prevents microbes from breeding and keeps the floor sterile.
7. Which of the following PVC product is not there in the market?
a) PVC brick decor
b) PVC door
c) PVC cement
d) PVC plaster
Explanation: PVC brick wallpapers are available, with an adhesive at the back. PVC cement is used to attach 2 PVC pipes. PVC doors are also common. PVC plastering accessories are available, not PVC plaster.
Explanation: Coupler has threaded or plain ends. It is a small piece used to connect 2 PVC pipes in a pipe line.
9. PVC plug is used to:
a) Connect pipes of varying diameter
b) Connect 2 pipe lines
c) Seal pipes of less diameter
d) Seal end of pipe line
Explanation: PVC plug and cap are used to seal the end of pipeline. They have a threaded endand the other end is closed.
10. How is PVC recycled commonly?
a) Feedstock process
b) VinyLoop process
c) Mechanical process
d) Chemical process
Explanation: VinyLoop process is most commonly employed. It involves filtering out composite materials and grinding it down to PVC granules.
11. Which additive in PVC pipe leads to contamination of potable water?
Explanation: Lead is added to increase stability and work ability of PVC pipes. It is found to leach into potable water from the surface of PVC pipes, hence, contaminating it.
12. Pure PVC is ____________ in colour.
Explanation: Pure PVC is white in colour. It can be coloured according to colour scheme followed in various countries for electrical usage, plumbing, etc.
Sanfoundry Global Education & Learning Series – Basic Civil Engineering.
To practice all areas of Basic Civil Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers.