Answer:
(a) True. In tensile stress, the interatomic separation becomes greater than equilibrium separation and the interatomic forces are attractive. In compressional stress, the interatomic separation becomes less than\[{{r}_{0}}\] and the interatomic forces are repulsive. (b) False. As the piece of rubber returns to its original length when unloaded, it is a case of elastic hysteresis in which there is some loss of energy. This signifies non-conservative forces. (c) False. Even if the stress-strain curves are non-linear, the elastic forces are conservative as long as loading and unloading curves are identical.
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