Question 1

Natural processes tend to increase the entropy of thermodynamic systems.

Accepted Answer

The second law of thermodynamics states that in a closed system, the entropy tends to increase over time. Natural processes are part of this system, so they tend to increase the entropy as well. Therefore, the statement is true.

Question 2

A bimetallic strip is usable in a thermometer because of its heat capacity.

Accepted Answer

A bimetallic strip is usable in a thermometer because it bends when heated due to the different coefficients of expansion of the two metals it is made of, not because of its heat capacity.

Question 3

A bimetallic strip is formed from two materials that have different heat capacities.

Accepted Answer

A bimetallic strip is formed from two materials that have different coefficients of thermal expansion. Heat capacity is a different property related to the amount of heat required to increase the temperature of a material by a certain amount.

Question 4

The specific heat capacity of copper is three times the specific heat capacity of lead.Equal masses of copper and lead are heated from room temperature to the temperature of boiling water.To achieve this,the amount of heat added to the copper is 3 times the amount of heat added to the lead.

Accepted Answer

This statement is true according to the given information. Copper has a specific heat capacity that is three times higher than lead, meaning it requires three times more heat energy to raise the temperature of copper compared to an equal mass of lead. Therefore, to heat both metals to the same temperature, three times more heat energy would need to be added to the copper compared to the amount added to the lead.

Question 5

The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass.An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water.The change in length of the ordinary glass rod will be 3 times the change in length of the Pyrex glass rod.

Accepted Answer

The coefficient of linear expansion is the factor by which a material expands when heated. The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. This means that for the same change in temperature, ordinary glass will expand three times as much as Pyrex glass. When the two rods are dropped into boiling water, they will both undergo thermal expansion. However, the extension of the ordinary glass rod will be three times that of the Pyrex glass rod because of its higher coefficient of linear expansion. Therefore, the statement is true.

Question 6

A thermostat can work because of a bimetallic strip.

Accepted Answer

A bimetallic strip is often used in thermostats. It is made up of two different metals that have different rates of expansion when heated. As the temperature changes, the metal strip coils or uncoils, opening or closing the circuit and regulating the temperature.

Question 7

Celsius degrees are larger than Fahrenheit degrees.

Accepted Answer

This is true. One Celsius degree is equivalent to 1.8 Fahrenheit degrees. Therefore, Celsius degrees are larger than Fahrenheit degrees.

Question 8

When you hold one end of a solid rod in a fire,the other end becomes hot because of heat convection.

Accepted Answer

Heat is transferred through the solid rod by conduction, not convection. Conduction occurs when heat is transferred through a material without the movement of the material itself.

Question 9

A barometer can work because of a bimetallic strip.

Accepted Answer

A barometer works by measuring changes in atmospheric pressure using a sealed glass tube filled with mercury or another fluid. There is no bimetallic strip involved in this process.

Question 10

One "food calorie" equals 1000 calories.

Accepted Answer

In nutrition, a "food calorie" (Calorie with an uppercase C) is equivalent to 1000 small calories (calories with a lowercase c), also known as a kilocalorie.

Question 11

When ice melts,its temperature increases.

Accepted Answer

When ice melts, it absorbs heat energy from the surroundings, which causes a phase change from solid to liquid. This heat energy does not result in an increase in temperature, but rather helps break the bonds between the molecules of the ice, resulting in a change in state. As a result, the temperature of the ice remains constant at 0 degrees Celsius until all the ice has melted.

Question 12

A hot pizza contains heat.

Accepted Answer

The answer of A hot pizza contains heat....

Question 13

A refrigerator is an example of a heat mover.

Accepted Answer

A refrigerator absorbs heat from the inside and releases it to the outside, moving heat from a colder area to a warmer area. Therefore, it is an example of a heat mover or a heat pump.

Question 14

You feel warm from the Sun at the beach because of heat radiation.

Accepted Answer

This is because the Sun emits electromagnetic waves, which include visible light and infrared radiation. When these waves come into contact with your skin, they transfer heat energy, causing you to feel warm.

Question 15

You can increase the internal energy of a gas by heating it or by compressing it.

Accepted Answer

Heating a gas increases the kinetic energy of its particles, while compressing it increases the potential energy of the particles due to their closer proximity. Both of these processes result in an increase in the internal energy of the gas.

Question 16

Heat is transferred from a substance if it is exposed to something that has a lower temperature.

Accepted Answer

Heat always flows from hot to cold objects, so if a substance is exposed to something with a lower temperature, heat will transfer from the substance to the cooler object.

Question 17

A steam turbine is an example of a heat mover.

Accepted Answer

A steam turbine is a device that converts thermal energy into mechanical work, not a heat mover. Heat movers transfer heat from one place to another, like refrigerators or heat pumps.

Question 18

As the air cools at night the relative humidity usually drops.

Accepted Answer

As the air cools at night, its capacity to hold moisture decreases, often causing the relative humidity to rise.

Question 19

On the Kelvin scale the temperature is proportional to the average kinetic energy of the atoms or molecules whose temperature is being measured.

Accepted Answer

This statement is true. The Kelvin scale is based on the absolute zero point, at which all thermal motion of particles would stop, and temperature is directly proportional to the average kinetic energy of the particles.

Question 20

A wood stove in the corner of a cabin causes the entire cabin to become heated because of heat conduction.

Accepted Answer

Heat conduction is the transfer of heat through a material, but in the case of a wood stove heating a cabin, the primary method of heat transfer is convection, where warm air circulates throughout the space, and radiation, where heat is emitted from the stove's surface.

Quiz 5: Temperature and Heat