Question 1

If an object made of an ordinary metal contains a small hole, when the temperature increases, the size of the hole

Accepted Answer

A)  increases. 
B)  decreases. 
C)  remains unchanged. 
D)  cannot be determined. 
A)  increases. 
B)  decreases. 
C)  remains unchanged. 
D)  cannot be determined. A

Question 2

The specific heat at constant pressure is larger than the specific heat at constant volume because during a constant pressure process

Accepted Answer

A)  some of the particles are lost. 
B)  the number of moles is increased. 
C)  the volume of the gas remains constant. 
D)  part of the heat is converted into work. 
A)  some of the particles are lost. 
B)  the number of moles is increased. 
C)  the volume of the gas remains constant. 
D)  part of the heat is converted into work. D

Question 3

During an adiabatic expansion of a monatomic gas, a 3% increase in the volume of the gas will produce a decrease in the temperature (absolute) of the gas of

Accepted Answer

A)  2%. 
B)  3%. 
C)  4%. 
D)  6%. 
A)  2%. 
B)  3%. 
C)  4%. 
D)  6%. A

Question 4

The order of magnitude for the coefficient of linear expansion for most metals is

Accepted Answer

A)  1/10,000,000. 
B)  1/100,000. 
C)  1/1,000. 
D)  1/10. 
A)  1/10,000,000. 
B)  1/100,000. 
C)  1/1,000. 
D)  1/10.

Question 5

In a comparison between the magnitudes of the heat of fusion Hf and the heat of vaporization Hv, the normal relation

Accepted Answer

A)  is Hf > Hv. 
B)  is Hf = Hv. 
C)  is Hf v. 
D)  depends on the material. 
A)  is Hf > Hv. 
B)  is Hf = Hv. 
C)  is Hf v. 
D)  depends on the material.

Question 6

The specific heat of a material is the amount of heat that, when applied to

Accepted Answer

A)  1 kilogram of the material, raises its temperature by 1 degree Celsius. 
B)  the total mass (in kilograms) of the material, raises its temperature by 1 degree Celsius. 
C)  1 kilogram of the material, raises it to its final temperature. 
D)  the total mass (in kilograms) of the material, raises it to its final temperature. 
A)  1 kilogram of the material, raises its temperature by 1 degree Celsius. 
B)  the total mass (in kilograms) of the material, raises its temperature by 1 degree Celsius. 
C)  1 kilogram of the material, raises it to its final temperature. 
D)  the total mass (in kilograms) of the material, raises it to its final temperature.

Question 7

The proper relation between Cv and Cp for ideal gases is

Accepted Answer

A)  Cp / Cv = constant. 
B)  Cp - Cv = constant. 
C)  Cp + Cv = constant. 
D)  none of the above. 
A)  Cp / Cv = constant. 
B)  Cp - Cv = constant. 
C)  Cp + Cv = constant. 
D)  none of the above.

Question 8

If the loss in gravitational potential energy of a volume of water falling 100 meters (quite a high waterfall!) were converted completely to heat, the resultant rise in temperature of the water would be on the order of

Accepted Answer

A)  1/1000 degrees Celsius. 
B)  1 degree Celsius. 
C)  1000 degrees Celsius. 
D)  an amount that cannot be determined from the information presented. 
A)  1/1000 degrees Celsius. 
B)  1 degree Celsius. 
C)  1000 degrees Celsius. 
D)  an amount that cannot be determined from the information presented.

Question 9

For most solids all of the following statements are valid except

Accepted Answer

A)  higher temperatures increase the amplitude of the vibratory motion of the molecules about their equilibrium position. 
B)  the interatomic force is asymmetric. 
C)  higher temperatures result in a larger average separation of molecules. 
D)  none of the above. 
A)  higher temperatures increase the amplitude of the vibratory motion of the molecules about their equilibrium position. 
B)  the interatomic force is asymmetric. 
C)  higher temperatures result in a larger average separation of molecules. 
D)  none of the above.

Question 10

The peculiar behavior of water near 4 degrees Celsius is described by all of the following except

Accepted Answer

A)  its density is at a maximum. 
B)  its cubical expansion coefficient changes sign. 
C)  for a given mass, its volume is at a minimum. 
D)  none of the above. 
A)  its density is at a maximum. 
B)  its cubical expansion coefficient changes sign. 
C)  for a given mass, its volume is at a minimum. 
D)  none of the above.

Question 11

Metals are good conductors of heat. The principal mechanism whereby heat conduction in metals takes place is by

Accepted Answer

A)  one atom interacting with the next atom. 
B)  one atom avoiding interaction with the next atom. 
C)  one electron interacting with the next electron. 
D)  one electron avoiding interaction with the next electron. 
A)  one atom interacting with the next atom. 
B)  one atom avoiding interaction with the next atom. 
C)  one electron interacting with the next electron. 
D)  one electron avoiding interaction with the next electron.

Question 12

Because work is done by an ideal gas when its volume increases, we expect that

Accepted Answer

A)  Cv > Cp. 
B)  Cv = Cp. 
C)  Cv p. 
D)  the relation depends on the temperature of the gas. 
A)  Cv > Cp. 
B)  Cv = Cp. 
C)  Cv p. 
D)  the relation depends on the temperature of the gas.

Question 13

The adiabatic equation is of the form

Accepted Answer

A)  $p V ^ { \gamma }$ = constant. 
B)  $p ^ { \gamma } V$ = constant. 
C)  $p / V ^ { r }$ = constant. 
D)  $V / p ^ { \gamma } $ = constant. 
A)  $p V ^ { \gamma }$ = constant. 
B)  $p ^ { \gamma } V$ = constant. 
C)  $p / V ^ { r }$ = constant. 
D)  $V / p ^ { \gamma } $ = constant.

Question 14

The British thermal unit (Btu) is the heat that, when applied to

Accepted Answer

A)  1 pound of water, raises its temperature by 1 degree Fahrenheit. 
B)  1 pound of water, raises its temperature by 1 degree Celsius. 
C)  1 kilogram of water, raises its temperature by 1 degree Celsius. 
D)  1 kilogram of water, raises its temperature by 1 degree Fahrenheit. 
A)  1 pound of water, raises its temperature by 1 degree Fahrenheit. 
B)  1 pound of water, raises its temperature by 1 degree Celsius. 
C)  1 kilogram of water, raises its temperature by 1 degree Celsius. 
D)  1 kilogram of water, raises its temperature by 1 degree Fahrenheit.

Question 15

Consider a volume of gas in a sealed container. Assume that we do work on the gas by slightly compressing it (making the volume slightly smaller). Recalling that the work that gas does on its surroundings is $d W = p d V$ , what is the sign of $d W$ in this case?

Accepted Answer

A)  Negative 
B)  Positive 
C)  Zero 
D)  Cannot be determined 
A)  Negative 
B)  Positive 
C)  Zero 
D)  Cannot be determined

Question 16

A glass rod, $k = 0.84$ W/(m.K), has cross-sectional area $A = 10$ cm $2$ and a length of 2 m. If the ends have a temperature difference of 100 K, the rate at which thermal energy is transported down the rod is

Accepted Answer

A)  87 mJ/s. 
B)  42 mJ/s. 
C)  33 mJ/s. 
D)  21 mJ/s. 
A)  87 mJ/s. 
B)  42 mJ/s. 
C)  33 mJ/s. 
D)  21 mJ/s.

Question 17

A 15-kg ball is held 3.2 m above the ground and then dropped. If all the energy is converted into heat, how many calories are produced?

Accepted Answer

A)  331 cal 
B)  112 cal 
C)  222 cal 
D)  470 cal 
A)  331 cal 
B)  112 cal 
C)  222 cal 
D)  470 cal

Question 18

Consider one kilogram of brass ( $c = 390$ J/kg·ºC) at a temperature of 31ºC. If we add 10 kJ of heat to the brass, the final temperature is

Accepted Answer

A)  35ºC. 
B)  41ºC. 
C)  49ºC. 
D)  57ºC. 
A)  35ºC. 
B)  41ºC. 
C)  49ºC. 
D)  57ºC.

Question 19

Consider ordinary liquid water at 4ºC. Heat is extracted from the water, causing its temperature to drop by a few degrees. The density of the water will

Accepted Answer

A)  decrease. 
B)  remain constant. 
C)  increase. 
D)  do none of the above. 
A)  decrease. 
B)  remain constant. 
C)  increase. 
D)  do none of the above.

Question 20

A long metal ruler is heated, and its length expands by 0.001%. At the same time, a small hole in the ruler will increase in area by about

Accepted Answer

A)  0.001%. 
B)  0.002%. 
C)  0.003%. 
D)  0.004%. 
A)  0.001%. 
B)  0.002%. 
C)  0.003%. 
D)  0.004%.

Exam 20: Heat

If an object made of an ordinary metal contains a small hole, when the temperature increases, the size of the hole

The specific heat at constant pressure is larger than the specific heat at constant volume because during a constant pressure process

During an adiabatic expansion of a monatomic gas, a 3% increase in the volume of the gas will produce a decrease in the temperature (absolute) of the gas of

The order of magnitude for the coefficient of linear expansion for most metals is

In a comparison between the magnitudes of the heat of fusion Hf and the heat of vaporization Hv, the normal relation

The specific heat of a material is the amount of heat that, when applied to

The proper relation between Cv and Cp for ideal gases is

If the loss in gravitational potential energy of a volume of water falling 100 meters (quite a high waterfall!) were converted completely to heat, the resultant rise in temperature of the water would be on the order of

For most solids all of the following statements are valid except

The peculiar behavior of water near 4 degrees Celsius is described by all of the following except

Metals are good conductors of heat. The principal mechanism whereby heat conduction in metals takes place is by

Because work is done by an ideal gas when its volume increases, we expect that

The adiabatic equation is of the form

The British thermal unit (Btu) is the heat that, when applied to

Consider a volume of gas in a sealed container. Assume that we do work on the gas by slightly compressing it (making the volume slightly smaller). Recalling that the work that gas does on its surroundings is dW=pdVd W = p d VdW=pdV , what is the sign of dWd WdW in this case?

A glass rod, k=0.84k = 0.84k=0.84 W/(m.K), has cross-sectional area A=10A = 10A=10 cm 222 and a length of 2 m. If the ends have a temperature difference of 100 K, the rate at which thermal energy is transported down the rod is

A 15-kg ball is held 3.2 m above the ground and then dropped. If all the energy is converted into heat, how many calories are produced?

Consider one kilogram of brass ( c=390c = 390c=390 J/kg·ºC) at a temperature of 31ºC. If we add 10 kJ of heat to the brass, the final temperature is

Consider ordinary liquid water at 4ºC. Heat is extracted from the water, causing its temperature to drop by a few degrees. The density of the water will

A long metal ruler is heated, and its length expands by 0.001%. At the same time, a small hole in the ruler will increase in area by about

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In a comparison between the magnitudes of the heat of fusion H_fand the heat of vaporization H_v, the normal relation

The proper relation between C_vand C_pfor ideal gases is

Consider a volume of gas in a sealed container. Assume that we do work on the gas by slightly compressing it (making the volume slightly smaller). Recalling that the work that gas does on its surroundings is $d W = p d V$ , what is the sign of $d W$ in this case?

A glass rod, $k = 0.84$ W/(m.K), has cross-sectional area $A = 10$ cm $2$ and a length of 2 m. If the ends have a temperature difference of 100 K, the rate at which thermal energy is transported down the rod is

Consider one kilogram of brass ( $c = 390$ J/kg·ºC) at a temperature of 31ºC. If we add 10 kJ of heat to the brass, the final temperature is