1) As shown in the figure, a bimetallic strip, consisting of metal G on the top and metal H on the bottom, is rigidly attached to a wall at the left. The coefficient of linear thermal expansion for metal G is greater than that of metal H. If the strip is
B
2) Consider a flat steel plate with a hole through its center as shown in the figure. When the temperature of the plate is increased, the hole will
A) expand only if it takes up more than half the plate's surface area.
B) contract if it takes up less than
D
3) The coefficient of linear expansion for aluminum is 1.8 � 10-6 K-1. What is its coefficient of volume expansion?
A) 9.0 � 10-6 K-1
B) 5.8 � 10-18 K-1
C) 5.4 � 10-6 K-1
D) 3.6 � 10-6 K-1
E) 0.60 � 10-6 K-1
C
5) If you wanted to know how much the temperature of a particular piece of material would rise when a known amount of heat was added to it, which of the following quantities would be most helpful to know?
A) initial temperature
B) specific heat
C) density
B
7) A thermally isolated system is made up of a hot piece of aluminum and a cold piece of copper, with the aluminum and the copper in thermal contact. The specific heat capacity of aluminum is more than double that of copper. Which object experiences the g
D
9) Object 1 has three times the specific heat capacity and four times the mass of Object 2. The two objects are given the same amount of heat. If the temperature of Object 1 changes by an amount ?T, the change in temperature of Object 2 will be
A) ?T.
B)
E
11) The figure shows a graph of the temperature of a pure substance as a function of time as heat is added to it at a constant rate in a closed container. If LF is the latent heat of fusion of this substance and LV is its latent heat of vaporization, what
D
12) A solid cylindrical bar conducts heat at a rate of 25 W from a hot to a cold reservoir under steady state conditions. If both the length and the diameter of this bar are doubled, the rate at which it will conduct heat between these reservoirs will be
C
14) An architect is interested in estimating the rate of heat loss, ?Q/?t, through a sheet of insulating material as a function of the thickness of the sheet. Assuming fixed temperatures on the two faces of the sheet and steady state heat flow, which one
C
15) On a cold day, a piece of metal feels much colder to the touch than a piece of wood. This is due to the difference in which one of the following physical properties of these materials?
A) density
B) specific heat
C) emissivity
D) thermal conductivity
D
17) The process in which heat flows by the mass movement of molecules from one place to another is known as
A) conduction.
B) convection.
C) radiation.
B
18) An object having a fixed emissivity of 0.725 radiates heat at a rate of 10 W when it is at an absolute temperature T. If its temperature is doubled to 2T, at what rate will it now radiate?
A) 20 W
B) 40 W
C) 80 W
D) 160 W
E) 320 W
D
19) If the absolute temperature of an object is tripled, the thermal power radiated by this object (assuming that its emissivity and size are not affected by the temperature change) will
A) increase by a factor of 3.
B) increase by a factor of 9.
C) incre
E
20) By what primary heat transfer mechanism does the sun warm the earth?
A) convection
B) conduction
C) radiation
D) All of the above processes are equally important in combination.
C
22) Consider two equal-volume flasks of gas at the same temperature and pressure. One gas, oxygen, has a molecular mass of 32. The other gas, nitrogen, has a molecular mass of 28. What is the ratio of the number of oxygen molecules to the number of nitrog
E
24) A mole of diatomic oxygen molecules and a mole of diatomic nitrogen molecules are at STP. Which statements are true about these molecules? (There could be more than one correct choice.)
A) Both gases have the same average molecular speeds.
B) Both gas
B,C
26) A sample of an ideal gas is heated and its Kelvin temperature doubles. If the root-mean-square speed of its molecules was originally v, what is the new root-mean-square speed?
A) 4v
B) 2v
C) v
D) v/
E) v/4
C
32) For an ideal gas,
A) CP = CV for all ideal gases.
B) CP > CV for all ideal gases.
C) CP < CV for all ideal gases.
D) it depends on whether the gas is monatomic or diatomic.
B
34) A certain ideal gas has a molar specific heat at constant volume 7R/2. What is its molar specific heat at constant pressure?
A) 5R/2
B) 3R/2
C) 8R
D) 9R/2
E) 6R
D
37) When a gas expands adiabatically,
A) the internal (thermal) energy of the gas decreases.
B) the internal (thermal) energy of the gas increases.
C) it does no work.
D) work is done on the gas.
E) the temperature of the gas remains constant.
A
38) An ideal gas is compressed isothermally to one-third of its initial volume. The resulting pressure will be
A) three times as large as the initial value.
B) less than three times as large as the initial value.
C) more than three times as large as the i
A
The process shown on the pV diagram in the figure is an
A) adiabatic expansion.
B) isothermal expansion.
C) isometric expansion.
D) isobaric expansion.
D
) The process shown on the pV diagram in the figure is
A) adiabatic.
B) isothermal.
C) isochoric.
D) isobaric.
C
) A gas is taken through the cycle shown in the pV diagram in the figure. During one cycle, how much work is done by the gas?
A) p0V0
B) 2 p0V0
C) 3 p0V0
D) 4 p0V0
C