Q:
      
      
         
            
The modulus of elasticity for mild steel is approximately equal to
         
       
      
      
      
          
      
      
          Answer & Explanation
         Answer: A) 210 kN/mm2         
         
Explanation: It is useful to have a property of a material that is independent of the size of the sample and can be use to compare its elastic properties with another - this is called the Modulus of Elasticity for the material.
The modulus of elasticity is defined as:
 
Modulus of elasticity = Stress / Strain
 
There are three types of moduli. They are :
(a) the Young Modulus - tensile and compression longitudinal stress
(b) the shear modulus - a shearing stress
(c) the bulk modulus - volume changes of the specimen.
 

       
      
      
      
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