Question 1

In the figure, what is the sign of the work done by the gas?

Accepted Answer

A)  positive if the transition is A → B and negative if the transition is B → A 
B)  negative if the transition is A → B and positive if the transition is B → A 
C)  positive 
D)  negative 
E)  zero (no work is done) 
A)  positive if the transition is A → B and negative if the transition is B → A 
B)  negative if the transition is A → B and positive if the transition is B → A 
C)  positive 
D)  negative 
E)  zero (no work is done)

Question 2

If the zeroth law of thermodynamics were not valid, which of the following could not be considered a property of an object?

Accepted Answer

A)  Pressure 
B)  Center of mass energy 
C)  Internal energy 
D)  Momentum 
E)  Temperature 
A)  Pressure 
B)  Center of mass energy 
C)  Internal energy 
D)  Momentum 
E)  Temperature

Question 3

It is more difficult to measure the coefficient of volume expansion of a liquid than that of a solid because:

Accepted Answer

A)  no relation exists between linear and volume expansion coefficients 
B)  a liquid tends to evaporate 
C)  a liquid expands too much when heated 
D)  a liquid expands too little when heated 
E)  the containing vessel also expands 
A)  no relation exists between linear and volume expansion coefficients 
B)  a liquid tends to evaporate 
C)  a liquid expands too much when heated 
D)  a liquid expands too little when heated 
E)  the containing vessel also expands

Question 4

The diagram shows four rectangular plates and their dimensions. All are made of the same material. The temperature now increases. Of these plates:

Accepted Answer

A)  the vertical dimension of plate 1 increases the most and the area of plate 1 increases the most 
B)  the vertical dimension of plate 2 increases the most and the area of plate 4 increases the most 
C)  the vertical dimension of plate 3 increases the most and the area of plate 1 increases the most 
D)  the vertical dimension of plate 4 increases the most and the area of plate 3 increases the most 
E)  the vertical dimension of plate 4 increases the most and the area of plate 4 increases the most 
A)  the vertical dimension of plate 1 increases the most and the area of plate 1 increases the most 
B)  the vertical dimension of plate 2 increases the most and the area of plate 4 increases the most 
C)  the vertical dimension of plate 3 increases the most and the area of plate 1 increases the most 
D)  the vertical dimension of plate 4 increases the most and the area of plate 3 increases the most 
E)  the vertical dimension of plate 4 increases the most and the area of plate 4 increases the most

Question 5

The diagram shows four slabs of different materials with equal thickness, placed side by side. Heat flows from left to right and the steady-state temperatures of the interfaces are given. Rank the materials according to their rates of thermal conduction, smallest to largest.

Accepted Answer

A)  1, 2, 3, 4 
B)  2, 1, 3, 4 
C)  1, 2, 4, 3 
D)  3, 4, 2, 1 
E)  all are equal 
A)  1, 2, 3, 4 
B)  2, 1, 3, 4 
C)  1, 2, 4, 3 
D)  3, 4, 2, 1 
E)  all are equal

Question 6

The units of thermal conductivity might be:

Accepted Answer

A)  cal.cm/(s.C $\degree$) 
B)  cal/(cm.s.0C $\degree$) 
C)  cal.s/(cm.C $\degree$) 
D)  cm.s.C $\degree$/cal 
E)  C $\degree$/(cal.cm.s) 
A)  cal.cm/(s.C $\degree$) 
B)  cal/(cm.s.0C $\degree$) 
C)  cal.s/(cm.C $\degree$) 
D)  cm.s.C $\degree$/cal 
E)  C $\degree$/(cal.cm.s)

Question 7

The coefficient of linear expansion of iron is 10-5 per C $\degree$ . The volume of an iron cube, 5 cm on edge, will increase by what amount if it is heated from 10 $\degree$C to 60 $\degree$C?

Accepted Answer

A)  0.00375 cm3 
B)  0.1875 cm3 
C)  0.0225 cm3 
D)  0.0075 cm3 
E)  0.0625 cm3 
A)  0.00375 cm3 
B)  0.1875 cm3 
C)  0.0225 cm3 
D)  0.0075 cm3 
E)  0.0625 cm3

Question 8

Fifty grams of ice at 0  $\degree$C is placed in a thermos bottle containing one hundred grams of water at 6  $\degree$C. How many grams of ice will melt? The heat of fusion of water is 333 kJ/kg and the specific heat of water is 4190 J/kg . K.

Accepted Answer

A)  7.5 g 
B)  2.0 g 
C)  8.3 g 
D)  17 g 
E)  50 g 
A)  7.5 g 
B)  2.0 g 
C)  8.3 g 
D)  17 g 
E)  50 g

Question 9

There is a temperature at which the reading on the Kelvin scale is numerically:

Accepted Answer

A)  equal to that on the Celsius scale 
B)  lower than that on the Celsius scale 
C)  equal to that on the Fahrenheit scale 
D)  less than zero 
E)  none of the above 
A)  equal to that on the Celsius scale 
B)  lower than that on the Celsius scale 
C)  equal to that on the Fahrenheit scale 
D)  less than zero 
E)  none of the above

Question 10

During an adiabatic process an object does 100 J of work and its temperature decreases by 5 K. During another process it does 25 J of work and its temperature decreases by 5 K. Its heat capacity for the second process is:

Accepted Answer

A)  20 J/K 
B)  24 J/K 
C)  5 J/K 
D)  15 J/K 
E)  100 J/K 
A)  20 J/K 
B)  24 J/K 
C)  5 J/K 
D)  15 J/K 
E)  100 J/K

Question 11

A gas:

Accepted Answer

A)  does positive work as it expands. 
B)  does positive work as it contracts. 
C)  does no work if it expands adiabatically. 
D)  does negative work if it expands at constant pressure. 
E)  may do either positive or negative work as it expands, depending on the heat transfer. 
A)  does positive work as it expands. 
B)  does positive work as it contracts. 
C)  does no work if it expands adiabatically. 
D)  does negative work if it expands at constant pressure. 
E)  may do either positive or negative work as it expands, depending on the heat transfer.

Question 12

The mercury column in an ordinary medical thermometer doubles in length when its temperature changes from 95 $\degree$F to 105 $\degree$F. Choose the correct statement:

Accepted Answer

A)  the coefficient of volume expansion of mercury is 0.10 per  $\degree$ 
B)  the coefficient of volume expansion of mercury is 0.30 per  $\degree$ 
C)  the coefficient of volume expansion of mercury is (0.10/3) per  $\degree$ 
D)  the vacuum above the column helps to "pull up" the mercury this large amount 
E)  none of the above is true 
A)  the coefficient of volume expansion of mercury is 0.10 per  $\degree$ 
B)  the coefficient of volume expansion of mercury is 0.30 per  $\degree$ 
C)  the coefficient of volume expansion of mercury is (0.10/3) per  $\degree$ 
D)  the vacuum above the column helps to "pull up" the mercury this large amount 
E)  none of the above is true

Question 13

Steam at 100 $\degree$C enters a radiator and leaves as water (at 80 $\degree$C). Take the heat of vaporization to be 540 cal/g. Of the total energy given off as heat, what percent arises from the cooling of the water?

Accepted Answer

A)  100% 
B)  54% 
C)  26% 
D)  14% 
E)  3.6% 
A)  100% 
B)  54% 
C)  26% 
D)  14% 
E)  3.6%

Question 14

The "triple point" of a substance is that point for which the temperature and pressure are such that:

Accepted Answer

A)  only solid and liquid are in equilibrium 
B)  only liquid and vapor are in equilibrium 
C)  only solid and vapor are in equilibrium 
D)  solid, liquid and vapor are all in equilibrium 
E)  the temperature, pressure and density are all numerically equal 
A)  only solid and liquid are in equilibrium 
B)  only liquid and vapor are in equilibrium 
C)  only solid and vapor are in equilibrium 
D)  solid, liquid and vapor are all in equilibrium 
E)  the temperature, pressure and density are all numerically equal

Question 15

A slab of material has area A, thickness L, and thermal conductivity k. One of its surfaces (P) is maintained at temperature T1 and the other surface (Q) is maintained at a lower temperature T2. The rate of heat flow from P to Q is:

Accepted Answer

A)  kA(T1 - T2)/L2 
B)  kL(T1 - T2)/A 
C)  kA(T1 - T2)/L 
D)  k(T1 - T2)/(L
A)  
E)  LA(T1 - T2)/k 
A)  kA(T1 - T2)/L2 
B)  kL(T1 - T2)/A 
C)  kA(T1 - T2)/L 
D)  k(T1 - T2)/(L
A)  
E)  LA(T1 - T2)/k

Question 16

Which one of the following statements is true?

Accepted Answer

A)  temperatures differing by 25 $\degree$ on the Fahrenheit scale must differ by 45 $\degree$on the Celsius scale 
B)  40 K corresponds to -40 $\degree$C 
C)  temperatures which differ by 10 $\degree$ on the Celsius scale must differ by 18 $\degree$ on the Fahrenheit scale 
D)  water at 90 $\degree$C is warmer than water at 202 $\degree$F 
E)  0 $\degree$F corresponds to -32 $\degree$C 
A)  temperatures differing by 25 $\degree$ on the Fahrenheit scale must differ by 45 $\degree$on the Celsius scale 
B)  40 K corresponds to -40 $\degree$C 
C)  temperatures which differ by 10 $\degree$ on the Celsius scale must differ by 18 $\degree$ on the Fahrenheit scale 
D)  water at 90 $\degree$C is warmer than water at 202 $\degree$F 
E)  0 $\degree$F corresponds to -32 $\degree$C

Question 17

When two gases separated by a diathermal wall are in thermal equilibrium with each other:

Accepted Answer

A)  only their pressure must be the same 
B)  only their volumes must be the same 
C)  they must have the same number of particles 
D)  they must have the same pressure and the same volume 
E)  only their temperatures must be the same 
A)  only their pressure must be the same 
B)  only their volumes must be the same 
C)  they must have the same number of particles 
D)  they must have the same pressure and the same volume 
E)  only their temperatures must be the same

Question 18

Which of the following statements pertaining to a vacuum flask (thermos) is NOT correct?

Accepted Answer

A)  Silvering reduces radiation loss 
B)  Vacuum reduces conduction loss 
C)  Vacuum reduces convection loss 
D)  Vacuum reduces radiation loss 
E)  Glass walls reduce conduction loss 
A)  Silvering reduces radiation loss 
B)  Vacuum reduces conduction loss 
C)  Vacuum reduces convection loss 
D)  Vacuum reduces radiation loss 
E)  Glass walls reduce conduction loss

Question 19

In a constant-volume process with a gas,

Accepted Answer

A)  no heat is exchanged with the environment 
B)  the internal energy of the gas does not change 
C)  the gas does no work 
D)  the pressure of the gas does not change 
E)  the temperature of the gas does not change 
A)  no heat is exchanged with the environment 
B)  the internal energy of the gas does not change 
C)  the gas does no work 
D)  the pressure of the gas does not change 
E)  the temperature of the gas does not change

Question 20

The diagram shows four slabs of different materials with equal thickness, placed side by side. Heat flows from left to right and the steady-state temperatures of the interfaces are given. Rank the materials according to their thermal conductivities, smallest to largest.

Accepted Answer

A)  1, 2, 3, 4 
B)  2, 1, 3, 4 
C)  1, 2, 4, 3 
D)  3, 4, 2, 1 
E)  4, 3, 2, 1 
A)  1, 2, 3, 4 
B)  2, 1, 3, 4 
C)  1, 2, 4, 3 
D)  3, 4, 2, 1 
E)  4, 3, 2, 1

Exam 18: Temperature, Heat, and the First Law of Thermodynamics

In the figure, what is the sign of the work done by the gas?

If the zeroth law of thermodynamics were not valid, which of the following could not be considered a property of an object?

It is more difficult to measure the coefficient of volume expansion of a liquid than that of a solid because:

The diagram shows four rectangular plates and their dimensions. All are made of the same material. The temperature now increases. Of these plates:

The diagram shows four slabs of different materials with equal thickness, placed side by side. Heat flows from left to right and the steady-state temperatures of the interfaces are given. Rank the materials according to their rates of thermal conduction, smallest to largest.

The units of thermal conductivity might be:

The coefficient of linear expansion of iron is 10-5 per C °\degree° . The volume of an iron cube, 5 cm on edge, will increase by what amount if it is heated from 10 °\degree° C to 60 °\degree° C?

Fifty grams of ice at 0 °\degree° C is placed in a thermos bottle containing one hundred grams of water at 6 °\degree° C. How many grams of ice will melt? The heat of fusion of water is 333 kJ/kg and the specific heat of water is 4190 J/kg . K.

There is a temperature at which the reading on the Kelvin scale is numerically:

During an adiabatic process an object does 100 J of work and its temperature decreases by 5 K. During another process it does 25 J of work and its temperature decreases by 5 K. Its heat capacity for the second process is:

A gas:

The mercury column in an ordinary medical thermometer doubles in length when its temperature changes from 95 °\degree° F to 105 °\degree° F. Choose the correct statement:

Steam at 100 °\degree° C enters a radiator and leaves as water (at 80 °\degree° C). Take the heat of vaporization to be 540 cal/g. Of the total energy given off as heat, what percent arises from the cooling of the water?

The "triple point" of a substance is that point for which the temperature and pressure are such that:

A slab of material has area A, thickness L, and thermal conductivity k. One of its surfaces (P) is maintained at temperature T1 and the other surface (Q) is maintained at a lower temperature T2. The rate of heat flow from P to Q is:

Which one of the following statements is true?

When two gases separated by a diathermal wall are in thermal equilibrium with each other:

Which of the following statements pertaining to a vacuum flask (thermos) is NOT correct?

In a constant-volume process with a gas,

The diagram shows four slabs of different materials with equal thickness, placed side by side. Heat flows from left to right and the steady-state temperatures of the interfaces are given. Rank the materials according to their thermal conductivities, smallest to largest.

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The coefficient of linear expansion of iron is 10^-5 per C $\degree$ . The volume of an iron cube, 5 cm on edge, will increase by what amount if it is heated from 10 $\degree$ C to 60 $\degree$ C?

Fifty grams of ice at 0 $\degree$ C is placed in a thermos bottle containing one hundred grams of water at 6 $\degree$ C. How many grams of ice will melt? The heat of fusion of water is 333 kJ/kg and the specific heat of water is 4190 J/kg . K.

The mercury column in an ordinary medical thermometer doubles in length when its temperature changes from 95 $\degree$ F to 105 $\degree$ F. Choose the correct statement:

Steam at 100 $\degree$ C enters a radiator and leaves as water (at 80 $\degree$ C). Take the heat of vaporization to be 540 cal/g. Of the total energy given off as heat, what percent arises from the cooling of the water?

A slab of material has area A, thickness L, and thermal conductivity k. One of its surfaces (P) is maintained at temperature T₁ and the other surface (Q) is maintained at a lower temperature T₂. The rate of heat flow from P to Q is: