Department of Natural Sciences
Clayton State University
Morrow, Georgia

February 3, 2009

SCI 1901E - Quiz 4

Name _________SOLUTION____________

Select the single best answer in the following multiple choice questions:

(03)     1.    Which of the following is a statement of the First Law of Thermodynamics?

a.        Heat flows spontaneously only from a hot object to a cold object.

b.        The change in total energy of a system is equal to the work done on the system plus the heat added to the system.

c.        The change in thermal energy of a system is equal to the heat added to the system.

d.        The change in mechanical energy of a system is equal to the change in temperature of the system.

(03)     2.    A material with a high specific heat 

a.        requires less heat to increase its temperature than a material of equal mass with a lower specific heat.

b.        releases less heat when it cools than a material of equal mass with a lower specific heat.

c.        cools more quickly than a material of equal mass with a lower specific heat.

d.        stores thermal energy longer than a material of equal mass with a lower specific heat.

(03)     3.    During a phase change,

a.        the temperature of a material remains constant.

b.        heat is released if the material goes from solid to liquid.

c.        heat is released if the material goes from liquid to gas.

d.        None of the above.

(03)     4.    The rate of heat flow by conduction

a.        is directly proportional to the surface area of the material through which heat passes.

b.        is directly proportional to the temperature difference across the material through which heat passes.

c.        is inversely proportional to the thickness of the material through which heat passes.

d.        All of the above.

(03)     5.    Convective heat transfer

a.        requires the motion of fluids.

b.        requires no medium for heat transfer.

c.        is most efficient in solids.

d.        None of the above.