Question

Recycling steel reduces:

(a) Energy use by 75%

(b) Energy use by 50%

(c) Energy use by 35%

(d) Energy use by 20%

This question was posed to me in a job interview.

Origin of the question is Cost Effective Materials in section Materials for Construction of Basic Civil Engineering

Answer 1

Correct option is (a) Energy use by 75%

Explanation: Six scrapped cars can yield a good strong steel frame.  It requires less energy (75%) to produce recycled steel than normal steel. It also saves space in landfills.