Explanation

• Grey is obtained using Raw Umber in paint mixtures.
• Raw umber is a natural earth pigment containing iron oxide and manganese.
• It is used to reduce brightness and create muted, earthy shades.
• Mixing raw umber with white can produce greyish-brown or neutral grey tones.
• It is commonly used in artistic and decorative painting.

Last verified on 04-08-2026

Explanation

• A Grillage Foundation is a special type of isolated footing.
• It is used for heavily loaded steel structures.
• It is suitable where the bearing capacity of the soil is poor.
• It spreads heavy column loads over a larger area.
• Grillage foundations are commonly used for steel columns and industrial structures.

Last verified on 04-08-2026

Explanation

• The Hydraulic test is the most commonly used method for testing pipelines.
• It checks the pipeline for leakage and strength under water pressure.
• The pipeline is filled with water and pressurized above its normal operating pressure.
• Any pressure drop or leakage indicates a defect.
• Hydraulic testing is widely used for water supply and pressure pipelines.

Last verified on 04-08-2026

Explanation

• Wood has the highest thermal resistance among the given materials.
• Thermal resistance is the ability of a material to resist the flow of heat.
• Wood is a good thermal insulator due to its low thermal conductivity.
• Materials with higher thermal resistance are commonly used for insulation.

Last verified on 04-08-2026

Explanation

• A Single-way cock is used to stop or allow the flow of fluid in a straight pipe.
• It controls the flow through a single passage.
• It is commonly used in water supply and plumbing systems.
• It allows easy opening and closing of the pipeline.
• It is used where only one flow path is required.

Last verified on 04-08-2026

Explanation

• A sink is commonly installed in the kitchen.
• It is used for washing utensils, vegetables, and food items.
• Kitchen sinks are connected to the water supply and drainage system.
• They are usually made of stainless steel, ceramic, or granite.
• A wash basin is generally installed in a lavatory (bathroom).

Last verified on 04-08-2026

Explanation

• The Head jamb is the upper horizontal member of a door frame.
• It connects the two side jambs of the frame.
• It supports the top of the door opening.

Additional information:

• The stile is the vertical member of the door shutter.
• A post is a vertical structural member.

Last verified on 04-08-2026

Explanation

In surveying, degree of curve is related to radius by:

For arc definition with 20 m chord: 

Degree of curve D = 1145.92 / R (R in meters)

Given R = 430 m

D = 1145.92 / 430 

D = 2.665° ≈ 2.67°

For arc definition with 30 m arc:

D = 1718.87 / R = 1718.87 / 430 = 4.00°

The most commonly used formula in many countries with 30 m arc gives:

D ≈ 4°

Last verified on 04-08-2026

Explanation

ppm = parts per million = mg of substance per liter of water 

Given:

Salt = 100 mg

Water = 1 liter

For water, 1 liter ≈ 1,000,000 mg

Concentration in ppm = (mg of salt / liters of water)

Concentration in ppm = 100 mg / 1 L = 100 ppm

Last verified on 04-08-2026

Explanation

• A tank in which sedimentation takes place is called a Settling Tank or Clarifier.
• Both terms are commonly used in water and wastewater treatment.
• Suspended solids settle at the bottom due to gravity.
• The clarified water flows out from the top.
• Sedimentation improves the efficiency of the treatment process.

Last verified on 04-08-2026