Question 1

A constant-volume gas thermometer is used to measure the temperature of an object.When the thermometer is in contact with water at its triple point (273 K)the pressure in the thermometer is 8.50  x  104 Pa.When it is in contact with the object the pressure is 9.65  x 104 Pa.The temperature of the object is:

Accepted Answer

A) 41.0 K 
B) 114 K 
C) 241 K 
D) 310 K 
E) 314 K

Question 2

The diagram shows four thermometers, labeled W, X, Y, and Z.The freezing and boiling points of water are indicated.Rank the thermometers according to the size of a degree on their scales, smallest to largest.

Accepted Answer

A) W, X, Y, Z 
B) Y, W, X, Z 
C) Z, Y, W, X 
D) Z, X, W, Y 
E) W, Y, Z, X

Question 3

The coefficient of linear expansion of steel is 11  x  10-6 per C°.A steel ball has a volume of exactly 100 cm3 at 0°C.When heated to 100°C, its volume becomes:

Accepted Answer

A) 100.33 cm3 
B) 100.11 cm3  
C) 100.0011 cm3 
D) 100.0033 cm3 
E) none of these

Question 4

The rate of heat flow by conduction through a slab does NOT depend upon the:

Accepted Answer

A) temperature difference between opposite faces of the slab 
B) thermal conductivity of the slab 
C) slab thickness 
D) cross-sectional area of the slab 
E) specific heat of the slab

Question 5

According to the first law of thermodynamics, applied to a gas, the increase in the internal energy during any process:

Accepted Answer

A) equals the heat input minus the work done on the gas 
B) equals the heat input plus the work done on the gas 
C) equals the work done on the gas minus the heat input 
D) is independent of the heat input 
E) is independent of the work done on the gas

Question 6

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

Question 7

Possible units for the coefficient of volume expansion are:

Accepted Answer

A) mm/C° 
B) mm3/C° 
C) (C°)3 
D) 1/(C°)3 
E) 1/C°

Question 8

Room temperature is about 20 degrees on the:

Accepted Answer

A) Kelvin scale 
B) Celsius scale 
C) Fahrenheit scale 
D) absolute scale 
E) C major scale

Question 9

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

Question 10

When the temperature of a copper penny is increased by 100 C°, its diameter increases by 0.17%.The area of one of its faces increases by:

Accepted Answer

A) 0.17% 
B) 0.34% 
C) 0.51% 
D) 0.13% 
E) 0.27%

Question 11

A system undergoes an adiabatic process in which its internal energy increases by 20 J.Which of the following statements is true?

Accepted Answer

A) 20 J of work was done on the system 
B) 20 J of work was done by the system 
C) the system received 20 J of energy as heat 
D) the system lost 20 J of energy as heat 
E) none of the above are true

Question 12

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

Question 13

A heat of transformation of a substance is:

Accepted Answer

A) the energy absorbed as heat during a phase transformation 
B) the energy per unit mass absorbed as heat during a phase transformation 
C) the same as the heat capacity 
D) the same as the specific heat 
E) the same as the molar specific heat

Question 14

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

Accepted Answer

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

Question 15

How many calories are required to change one gram of 0°C ice to 100°C steam? The latent heat of fusion is 80 cal/g and the latent heat of vaporization is 540 cal/g.The specific heat of water is 1.00 cal/g ° K.

Accepted Answer

A) 100 cal 
B) 540 cal 
C) 620 cal 
D) 720 cal 
E) 900 cal

Question 16

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

Question 17

Thin strips of iron and zinc are riveted together to form a bimetallic strip which bends when heated.The iron is on the inside of the bend because:

Accepted Answer

A) it has a higher coefficient of linear expansion 
B) it has a lower coefficient of linear expansion 
C) it has a higher specific heat 
D) it has a lower specific heat 
E) it conducts heat better

Question 18

A thermos bottle works well because:

Accepted Answer

A) its glass walls are thin 
B) silvering reduces convection 
C) vacuum reduces heat radiation 
D) silver coating is a poor heat conductor 
E) none of the above

Question 19

Steam at 100°C enters a radiator and leaves as water (at 80°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%

Question 20

Heat is:

Accepted Answer

A) energy transferred by virtue of a temperature difference 
B) energy transferred by macroscopic work 
C) energy content of an object 
D) a temperature difference 
E) a property objects have by virtue of their temperatures

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