Smart City Interview Questions and Answers

Steel unit weight varies with diameter.

• The unit weight of steel varies with the diameter of the steel.

• The weight of steel can be calculated using the formula: weight = volume x density.

• The density of steel is approximately 7850 kg/m³.

• The weight of a steel rod with a diameter of 10mm and a length of 1 meter is approximately 0.785 kg.

• The weight of a steel rod with a diameter of 20mm and a length of 1 meter is approximately 3.14 kg.

Cement types and grades depend on their composition and usage.

• Cement types include Portland cement, white cement, and blended cement.

• Grades are determined by strength and setting time.

• Portland cement has five grades: 33, 43, 53, 63, and 73.

• Blended cement is a mixture of Portland cement and other materials like fly ash or slag.

• White cement is used for decorative purposes.

• The choice of cement type and grade depends on the project requirements.