Discussion
In cadmium conductors, the addition of 1% or 2% cadmium in copper increases the tensile strength by about ______.
Answer: D
The key gives about 50 % as the increase in tensile strength when 1 to 2 % cadmium is added to copper. Cadmium copper is stronger than pure copper, with only a small loss of conductivity, and it is used for overhead lines of long spans, in trolley wires and in telephone lines.
I could not check the percentage in a source, so the answer follows the key. The values of 5 %, 15 % and 25 % are lower figures. The fourth option is the one given.
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