Question

3 a)

As the grain size in a metallic decreases, electrical conductivity is likely to increase significantly. O True False

b)

c)

d)

Answer 1

Solution :

Answer 3

Part a

True

If grain size if metallic reduce size, The density of contact area grain/grain increases, resistivity decresases and the conductivity will increases.

Part b

False

At 60 degree or at low temperatures Ductility increases more than toughness.

Part c

Ts < Cs

Tensile strength of concrete is much lower than its concete strength because ease with which cracks propagate under tensile load.

Part d

False

The thermal conductivity decreases with temperature increase.

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