1. Bitumen paint renders
ⓐ. a protective surface
ⓑ. a shining surface
ⓒ. a smooth surface
ⓓ. a hard surface
Correct Answer: Option ⓐ
Explanation: Bitumen paint is used to provide a protective surface coating. It forms a waterproof and durable protective layer when applied to various surfaces, helping to prevent moisture penetration and other forms of damage.
2. When a bitumen is graded by 75/15, the figure 75 represents
ⓐ. viscosity in centipoises
ⓑ. softening point in °C
ⓒ. fire point in °C
ⓓ. flash point in °C
Correct Answer: Option ⓑ
Explanation: When a bitumen is graded as 75/15, the figure 75 represents the softening point in degrees Celsius (°C). Bitumen grades provide information about various properties of the bitumen, such as its temperature-related characteristics.
3. *Softening point test (x/y) for bitumen is done at a temperature of upper numeral indicates the softening temperature (x°C) while the lower numeral indicates
ⓐ. viscosity
ⓑ. softening point
ⓒ. penetration
ⓓ. flash point
Correct Answer: Option ⓒ
Explanation: The softening point test for bitumen is denoted by two numerals (x/y). The upper numeral (x°C) indicates the softening temperature at which the bitumen softens, while the lower numeral (y) indicates the penetration value, which is related to the consistency of the bitumen.
4. *Plastic bitumen is generally used for
ⓐ. road pavements
ⓑ. painting
ⓒ. expansion joints
ⓓ. crack filling
Correct Answer: Option ⓓ
Explanation: Plastic bitumen is generally used for crack filling. It is a type of bitumen that remains pliable and flexible, making it suitable for sealing and filling cracks in road pavements and other surfaces.
5. *The commonly used grade of bitumen that is used in the moderate temperature range of Nepal is:
ⓐ. 60/100
ⓑ. 70/100
ⓒ. 80/100
ⓓ. 90/100
Correct Answer: Option ⓒ
Explanation: The commonly used grade of bitumen for the moderate temperature range is 80/100. Bitumen grades like 80/100 indicate specific properties and characteristics suitable for particular temperature conditions and applications.
6. *Bitumen is generally obtained from
ⓐ. organic material
ⓑ. petroleum product
ⓒ. synthetic material
ⓓ. coal
Correct Answer: Option ⓑ
Explanation: Bitumen is generally obtained from petroleum products. It is a viscous, black or dark brown material derived from crude oil through various refining processes.
7. *The weight loss on heating of bitumen used for pavement should not be more than
ⓐ. 1%
ⓑ. 3%
ⓒ. 4%
ⓓ. 5%
Correct Answer: Option ⓐ
Explanation: The weight loss on heating of bitumen used for pavement should not be more than 1%. This property ensures that the bitumen maintains its integrity and performance under heat and load conditions.
8. *Galvanizing means
ⓐ. depositing a fine film of zinc on iron or steel by dipping in molten zinc
ⓑ. depositing a fine film of tin on iron or steel by dipping in molten tin
ⓒ. depositing a finefilm of lead on iron or steel by dipping in molten iron
ⓓ. none of the above
Correct Answer: Option ⓐ
Explanation: Galvanizing means depositing a fine film of zinc on iron or steel by dipping it in molten zinc. This process is commonly used to protect iron and steel from corrosion, extending the lifespan of the metal.
9. *Brass is an alloy of
ⓐ. copper and zinc
ⓑ. copper and tin
ⓒ. copper and nickel
ⓓ. copper and chromium
Correct Answer: Option ⓐ
Explanation: Brass is an alloy of copper and zinc. It is known for its durability and resistance to corrosion, making it suitable for various applications, including the production of musical instruments and decorative items.
10. *Bronze is an alloy of
ⓐ. copper and zinc
ⓑ. copper and tin
ⓒ. copper and nickel
ⓓ. copper and chromium
Correct Answer: Option ⓑ
Explanation: Bronze is an alloy of copper and tin. It is a strong and durable material known for its resistance to corrosion and various mechanical properties. Bronze has been used historically for sculptures, coins, and other decorative and functional items.
11. Monel metal is an alloy of
ⓐ. copper and zinc
ⓑ. copper and tin
ⓒ. copper and nickel
ⓓ. copper and chromium
Correct Answer: Option ⓒ
Explanation: Monel metal is an alloy of copper and nickel. It is known for its high strength and resistance to corrosion, making it suitable for use in various applications, including marine engineering and chemical processing.
12. *Stainless steel metal is an alloy of
ⓐ. copper and zinc
ⓑ. copper and tin
ⓒ. copper and nickel
ⓓ. nickel and chromium
Correct Answer: Option ⓓ
Explanation: Stainless steel is an alloy of nickel and chromium. It is known for its high resistance to corrosion and staining, making it suitable for various applications where durability and hygiene are essential, such as kitchen utensils and medical equipment.
13. *Stainless steel resists corrosion due to
ⓐ. carbon
ⓑ. sulfur
ⓒ. nickel
ⓓ. chromium
Correct Answer: Option ⓓ
Explanation: Stainless steel resists corrosion due to the presence of chromium. Chromium forms a passive layer on the surface of stainless steel, protecting it from corrosion and oxidation, even in harsh environments.
14. German silver is an alloy of
ⓐ. zinc, lead, and nickel
ⓑ. copper, lead, and nickel
ⓒ. copper, zinc, and nickel
ⓓ. copper, lead, and zinc
Correct Answer: Option ⓒ
Explanation: German silver is an alloy of copper, zinc, and nickel. Despite its name, German silver does not contain silver but is valued for its silver-like appearance and resistance to corrosion, making it suitable for various decorative and ornamental purposes.
15. *The percentage of carbon in cast iron is:
ⓐ. 0.7%
ⓑ. 1.2 to 1.7%
ⓒ. 1.2%
ⓓ. 2 to 4.5%
Correct Answer: Option ⓓ
Explanation: The percentage of carbon in cast iron is typically in the range of 2 to 4.5%. Cast iron is known for its high carbon content, which contributes to its strength and brittleness, making it suitable for applications where hardness and wear resistance are required.
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