(Multiple choice) Which one of the following statements is true? Explain why the

Question

(Multiple choice)
Which one of the following statements is true? Explain why they are T/F
(a) When an overhead power line is fastened between utility poles and then subjected to a
sharp frost, the conductor will experience increased mechanical tension.
(b) Thermal shock resistance is promoted by a high thermal expansion coefficient and a high
thermal conductivity.
(c) Both the heat capacity and the specific heat capacity of amorphous polymers increase as
the polymer is cooled through its glass transition.
(d) Metals are characterized by a high specific heat capacity, high thermal conductivity, and
high electrical conductivity.
(e) Thermal conductivity depends on the ability of atoms to diffuse from warmer regions to
cooler regions in a material.

Explanation / Answer

a) By sharp frosting the vibration of atom decreases and the decrease in volume is responsible for the increase in mechanical tension.True

b) Resistance shock is inversly proportional to thermal expansion coefficient. False

c) False   ( below glass transition heat capcity and specfic heat capacity is decreased because below transition they become hard and brittle.)

d) True ( Metals are good conductor)

e) True( Heat is conducted by mean of atoms in conduction) .

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