Question 1

The same energy Q enters five different substances as heat.Which of these has the greatest specific heat?

Accepted Answer

A) The temperature of 3 g of substance A increases by 10 K 
B) The temperature of 4 g of substance B increases by 4 K 
C) The temperature of 6 g of substance C increases by 15 K 
D) The temperature of 8 g of substance D increases by 5 K 
E) The temperature of 10 g of substance E increases by 10 K 
A) The temperature of 3 g of substance A increases by 10 K 
B) The temperature of 4 g of substance B increases by 4 K 
C) The temperature of 6 g of substance C increases by 15 K 
D) The temperature of 8 g of substance D increases by 5 K 
E) The temperature of 10 g of substance E increases by 10 K B

Question 2

For constant volume processes the heat capacity of gas A is greater than the heat capacity of gas B.We conclude that when they both absorb the same energy as heat at constant volume:

Accepted Answer

A) the temperature of A increases more than the temperature of B 
B) the temperature of B increases more than the temperature of A 
C) the internal energy of A increases more than the internal energy of B 
D) the internal energy of B increases more than the internal energy of A 
E) A does more positive work than B 
A) the temperature of A increases more than the temperature of B 
B) the temperature of B increases more than the temperature of A 
C) the internal energy of A increases more than the internal energy of B 
D) the internal energy of B increases more than the internal energy of A 
E) A does more positive work than B B

Question 3

The specific heat of a substance is:

Accepted Answer

A) the amount of heat energy to change the state of one gram of the substance 
B) the amount of heat energy per unit mass emitted by oxidizing the substance 
C) the amount of heat energy per unit mass to raise the substance from its freezing to its boiling point 
D) the amount of heat energy per unit mass to raise the temperature of the substance by 1°C 
E) the temperature of the object divided by its mass 
A) the amount of heat energy to change the state of one gram of the substance 
B) the amount of heat energy per unit mass emitted by oxidizing the substance 
C) the amount of heat energy per unit mass to raise the substance from its freezing to its boiling point 
D) the amount of heat energy per unit mass to raise the temperature of the substance by 1°C 
E) the temperature of the object divided by its mass D

Question 4

The heat capacity of an object is:

Accepted Answer

A) the amount of heat energy to raise its temperature by 1°C 
B) the amount of heat energy to change its state without changing its temperature 
C) the amount of heat energy per kilogram to raise its temperature by 1°C 
D) the ratio of its specific heat to that of water 
E) the change in its temperature caused by adding 1 J of heat 
A) the amount of heat energy to raise its temperature by 1°C 
B) the amount of heat energy to change its state without changing its temperature 
C) the amount of heat energy per kilogram to raise its temperature by 1°C 
D) the ratio of its specific heat to that of water 
E) the change in its temperature caused by adding 1 J of heat

Question 5

A certain humidifier operates by raising water to the boiling point and then evaporating it.Every minute 30 g of water at 20°C are added to replace the 30 g that are evaporated.The heat of fusion of water is 333 kJ/kg, the heat of vaporization is 2256 kJ/kg, and the specific heat is 4190 J/kg  How many joules of energy per minute does this humidifier require?

Accepted Answer

A) 4800 J/min 
B) 18,600 J/min 
C) 24,600 J/min 
D) 77,700 J/min 
E) 10,100,000 J/min 
A) 4800 J/min 
B) 18,600 J/min 
C) 24,600 J/min 
D) 77,700 J/min 
E) 10,100,000 J/min

Question 6

An insulated container, filled with water, contains a thermometer and a paddle wheel.The paddle wheel can be rotated by an external source.This apparatus can be used to determine:

Accepted Answer

A) specific heat of water 
B) relation between kinetic energy and absolute temperature 
C) thermal conductivity of water 
D) efficiency of changing work into heat 
E) mechanical equivalent of heat 
A) specific heat of water 
B) relation between kinetic energy and absolute temperature 
C) thermal conductivity of water 
D) efficiency of changing work into heat 
E) mechanical equivalent of heat

Question 7

Metal pipes, used to carry water, sometimes burst in the winter because:

Accepted Answer

A) metal contracts more than water 
B) outside of the pipe contracts more than the inside 
C) metal becomes brittle when cold 
D) ice expands when it melts 
E) water expands when it freezes 
A) metal contracts more than water 
B) outside of the pipe contracts more than the inside 
C) metal becomes brittle when cold 
D) ice expands when it melts 
E) water expands when it freezes

Question 8

An electric stove burner of diameter 20 cm is at a temperature of 250 °C.If σ = 5.67 x 10-8 W/m2·K4, at what rate is the burner radiating energy? Assume the emissivity ε = 0.6.

Accepted Answer

A) 4 W 
B) 80 W 
C) 320 W 
D) 1600 W 
E) 8000 W 
A) 4 W 
B) 80 W 
C) 320 W 
D) 1600 W 
E) 8000 W

Question 9

A cube of aluminum has an edge length of 20 cm.Aluminum has a density 2.7 times that of water (1 g/cm3)and a specific heat 0.217 times that of water (1 cal/g°C ).When the internal energy of the cube increases by 47000 cal its temperature increases by:

Accepted Answer

A) 5 C° 
B) 10 C° 
C) 20 C° 
D) 100 C° 
E) 200 C° 
A) 5 C° 
B) 10 C° 
C) 20 C° 
D) 100 C° 
E) 200 C°

Question 10

The coefficient of expansion of a certain type of steel is 0.000012 per C°.The coefficient of volume expansion is:

Accepted Answer

A) (0.000012)3 (C°)-1 
B) (4°/3)(0.000012)3 (C°)-1 
C) 3 ° 0.000012 (C°)-1 
D) 0.000012 (C°)-1 
E) depends on the shape of the volume to which it will be applied 
A) (0.000012)3 (C°)-1 
B) (4°/3)(0.000012)3 (C°)-1 
C) 3 ° 0.000012 (C°)-1 
D) 0.000012 (C°)-1 
E) depends on the shape of the volume to which it will be applied

Question 11

During the time that latent heat is involved in a change of state:

Accepted Answer

A) the temperature does not change 
B) the substance always expands 
C) a chemical reaction takes place 
D) molecular activity remains constant 
E) kinetic energy changes into potential energy 
A) the temperature does not change 
B) the substance always expands 
C) a chemical reaction takes place 
D) molecular activity remains constant 
E) kinetic energy changes into potential energy

Question 12

To help keep buildings cool in the summer, dark colored window shades have been replaced by light colored shades.This is because light colored shades:

Accepted Answer

A) are more pleasing to the eye 
B) absorb more sunlight 
C) reflect more sunlight 
D) transmit more sunlight 
E) have a lower thermal conductivity 
A) are more pleasing to the eye 
B) absorb more sunlight 
C) reflect more sunlight 
D) transmit more sunlight 
E) have a lower thermal conductivity

Question 13

The international standard thermometer is kept:

Accepted Answer

A) near Washington, D.C. 
B) near Paris, France 
C) near the north pole 
D) near Rome, Italy 
E) nowhere (there is none) 
A) near Washington, D.C. 
B) near Paris, France 
C) near the north pole 
D) near Rome, Italy 
E) nowhere (there is none)

Question 14

Suppose object C is in thermal equilibrium with object A and with object B.The zeroth law of thermodynamics states:

Accepted Answer

A) that C will always be in thermal equilibrium with both A and B 
B) that C must transfer energy to both A and B 
C) that A is in thermal equilibrium with B 
D) that A cannot be in thermal equilibrium with B 
E) nothing about the relationship between A and B 
A) that C will always be in thermal equilibrium with both A and B 
B) that C must transfer energy to both A and B 
C) that A is in thermal equilibrium with B 
D) that A cannot be in thermal equilibrium with B 
E) nothing about the relationship between A and B

Question 15

If two objects are in thermal equilibrium with each other

Accepted Answer

A) they cannot be moving 
B) they cannot be undergoing an elastic collision 
C) they cannot have different pressures 
D) they cannot be at different temperatures 
E) they cannot be falling in the Earth's gravitational field 
A) they cannot be moving 
B) they cannot be undergoing an elastic collision 
C) they cannot have different pressures 
D) they cannot be at different temperatures 
E) they cannot be falling in the Earth's gravitational field

Question 16

Heat has the same units as:

Accepted Answer

A) temperature 
B) work 
C) energy/time 
D) heat capacity 
E) energy/volume 
A) temperature 
B) work 
C) energy/time 
D) heat capacity 
E) energy/volume

Question 17

The energy given off by 300 grams of an alloy as it cools by 50°C raises the temperature of 300 grams of water from 30°C to 40°C.The specific heat of the alloy is:

Accepted Answer

A) 5.0 cal/g °C 
B) 0.10 cal/g °C 
C) 0.15 cal/g °C 
D) 0.20 cal/g °C 
E) 0.50 cal/g °C 
A) 5.0 cal/g °C 
B) 0.10 cal/g °C 
C) 0.15 cal/g °C 
D) 0.20 cal/g °C 
E) 0.50 cal/g °C

Question 18

The formation of ice from water is accompanied by:

Accepted Answer

A) absorption of energy as heat 
B) temperature increase 
C) decrease in volume 
D) an evolution of heat 
E) temperature decrease 
A) absorption of energy as heat 
B) temperature increase 
C) decrease in volume 
D) an evolution of heat 
E) temperature decrease

Question 19

The coefficient of linear expansion of iron is 10-5 per C°.The volume of an iron cube, 5 cm on edge, will increase by what amount if it is heated from 10°C to 60°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 20

The units of thermal conductivity might be:

Accepted Answer

A) cal.cm/(s.C°) 
B) cal/(cm.s.C°) 
C) cal.s/(cm.C° 
D) cm.s.C°/cal 
E) C°/(cal.cm.s) 
A) cal.cm/(s.C°) 
B) cal/(cm.s.C°) 
C) cal.s/(cm.C° 
D) cm.s.C°/cal 
E) C°/(cal.cm.s)

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

The same energy Q enters five different substances as heat.Which of these has the greatest specific heat?

For constant volume processes the heat capacity of gas A is greater than the heat capacity of gas B.We conclude that when they both absorb the same energy as heat at constant volume:

The specific heat of a substance is:

The heat capacity of an object is:

An insulated container, filled with water, contains a thermometer and a paddle wheel.The paddle wheel can be rotated by an external source.This apparatus can be used to determine:

Metal pipes, used to carry water, sometimes burst in the winter because:

An electric stove burner of diameter 20 cm is at a temperature of 250 °C.If σ = 5.67 x 10-8 W/m2·K4, at what rate is the burner radiating energy? Assume the emissivity ε = 0.6.

A cube of aluminum has an edge length of 20 cm.Aluminum has a density 2.7 times that of water (1 g/cm3)and a specific heat 0.217 times that of water (1 cal/g°C ).When the internal energy of the cube increases by 47000 cal its temperature increases by:

The coefficient of expansion of a certain type of steel is 0.000012 per C°.The coefficient of volume expansion is:

During the time that latent heat is involved in a change of state:

To help keep buildings cool in the summer, dark colored window shades have been replaced by light colored shades.This is because light colored shades:

The international standard thermometer is kept:

Suppose object C is in thermal equilibrium with object A and with object B.The zeroth law of thermodynamics states:

If two objects are in thermal equilibrium with each other

Heat has the same units as:

The energy given off by 300 grams of an alloy as it cools by 50°C raises the temperature of 300 grams of water from 30°C to 40°C.The specific heat of the alloy is:

The formation of ice from water is accompanied by:

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

The units of thermal conductivity might be:

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Filters

An electric stove burner of diameter 20 cm is at a temperature of 250 °C.If σ = 5.67 x 10^-8 W/m²·K⁴, at what rate is the burner radiating energy? Assume the emissivity ε = 0.6.

A cube of aluminum has an edge length of 20 cm.Aluminum has a density 2.7 times that of water (1 g/cm³)and a specific heat 0.217 times that of water (1 cal/g°C ).When the internal energy of the cube increases by 47000 cal its temperature increases by:

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