10+ AmBoxDemo-NIS Interview Questions and Answers

The least count of a dumpy level staff reading is typically 0.01 ft or 1 mm.

• The least count is the smallest measurement that can be read on the scale of the dumpy level staff.

• For most dumpy levels, the least count is 0.01 ft or 1 mm.

• This means that the dumpy level can measure differences in elevation as small as 0.01 ft or 1 mm.

The volume of a 50 kg bag of cement varies depending on the density of the cement.

• The volume of cement can be calculated using the formula: Volume = Mass / Density

• The density of cement typically ranges from 1.1 to 1.6 g/cm^3

• For example, if the density of the cement is 1.4 g/cm^3, the volume of a 50 kg bag would be approximately 35.71 liters

The slump value of concrete for Normal RCC work is typically between 25-75 mm.

• The slump value of concrete for Normal RCC work is usually around 50 mm.

• The slump value can vary based on the specific requirements of the project and the mix design.

• A higher slump value indicates a more workable concrete mix, while a lower slump value may be used for specialized applications.

• It is important to test the slump value of concrete before pouring to ensure it meets the desired specificat...read more

Civil engineers at site are responsible for overseeing construction projects, ensuring they are completed safely, on time, and within budget.

• Supervising construction activities to ensure compliance with design specifications and safety standards

• Managing resources and materials efficiently to meet project deadlines

• Collaborating with architects, contractors, and other stakeholders to resolve any issues that may arise

• Conducting regular inspections and quality control checks to m...read more

Concrete cover is provided for reinforcement to protect it from corrosion, fire, and other environmental factors.

• Concrete cover protects reinforcement from corrosion by preventing exposure to moisture and aggressive chemicals.

• It provides fire resistance by acting as a barrier between the reinforcement and the fire.

• Concrete cover helps in maintaining the bond between reinforcement and concrete, ensuring structural integrity.

• Proper concrete cover thickness is essential to preve...read more

Minimum concrete grade for RCC work is M20.

• Minimum concrete grade for RCC work is M20 as per IS 456:2000.

• Higher grades like M25, M30, M35, etc. can also be used depending on structural requirements.

• Concrete grades indicate the compressive strength of concrete after 28 days of curing.

• Higher grades are used for structures requiring higher strength like bridges, high-rise buildings, etc.

The density of unit weight of cement is typically around 1440 kg/m^3.

• The density of unit weight of cement is commonly around 1440 kg/m^3.

• This value can vary slightly depending on the type and brand of cement.

• Density is a measure of mass per unit volume, in this case, kilograms per cubic meter.

Generally, 7-8 bags of cement are required to fill 1 cubic meter of concrete.

• On average, 7-8 bags of cement are needed to fill 1 cubic meter of concrete.

• The exact number of bags may vary based on the mix design and proportions used.

• For example, if each bag of cement is 50 kg, then 7 bags would be 350 kg and 8 bags would be 400 kg.

The size of a concrete cube is typically 150mm x 150mm x 150mm.

• Standard size of a concrete cube is 150mm x 150mm x 150mm

• Used for testing the compressive strength of concrete

• Other sizes like 100mm x 100mm x 100mm or 200mm x 200mm x 200mm may also be used

Ductility of steel refers to its ability to deform without breaking under stress.

• Ductility is a crucial property in structural engineering as it allows steel to be shaped and formed into various structures.

• Steel with high ductility can undergo significant deformation before failure.

• Ductility is often measured by the percentage of elongation or reduction in area during a tensile test.

• Examples of ductile materials include mild steel and stainless steel.

Grade of cement refers to the strength of the cement as per the compressive strength test.

• Grade of cement is determined by the compressive strength of cement mortar cubes at 28 days of curing.

• Common grades of cement include 33, 43, and 53 where the number represents the compressive strength in MPa.

• Higher grade cement is used for structures requiring higher strength like bridges and high-rise buildings.