The Young’s modulus of elasticity of steel, is A. 150 KN/mm2 B. 200 KN/mm2 C. 250 KN/mm2 D. 275 KN/mm2

The Young’s modulus of elasticity of steel is 200 KN/mm2. It is a measure of how much a material stretches or deforms under stress. A higher Young’s modulus means that the material is stiffer and will not deform as much under stress. Steel has a high Young’s modulus because it is a strong and stiff material.

Option A is incorrect because it is too low. Option B is correct. Option C is incorrect because it is too high. Option D is incorrect because it is the same as Option C.