Question

As per structural properties of structural steel, the unit mass of steel is____.
1. 250 × 10³ g/m³
2. 7835 × 10³ g/m³
3. 5000 × 10³ g/m³
4. 7850 × 10³ g/m³

Answer 1

Correct Answer - Option 4 : 7850 × 10³ g/m³

Explanation:

The properties of structural steel, as per clause 2.2.4 of IS 800:2007, for use in design, may be taken as given in clauses 2.2.4.1 and 2.2.4.2 of the code.

Physical Property	Value
Unit mass of steel, p	7850 kg/m3
Modulus of elasticity, E	2.0 × 105 N/mm2
Poisson ratio, μ	0.3
Modulus of rigidity, G	0.769 × 105 N/mm2
Coefficient of thermal expansion, Cx	12 × 10-6/ºC

Since, 

1 kg = 10³ g

Therefore, 7850 kg/m³ = 7850 × 103 g/m3