T/F HEAT
When ice changes to water at 0 degrees Celsius, energy is released.
False
Winds and weather patterns are good examples of radiation currents.
False
In a gas kept at a constant temperature, all molecules move with the same speed.
False
In a vacuum flask, the vacuum helps in reducing heat loss due to radiation.
False
The process of changing from a gas to a liquid is evaporation.
False
The process of changing from a liquid state to a solid state is condensation.
False
The process of changing from a liquid to a gas is condensation.
False
The temperature of a system must increase when heat energy is added.
False
The three common phases are mass, density, and volume.
False
The total of all energies in a substance is its temperature.
False
If the internal energy of a volume of air at 10 degrees Celsius is doubled, its temperature will then be 20 degrees Celsius.
False
A bimetallic strip consists of two strips of the same material welded together.
False
A calorie is a common unit of force.
False
A good emitter of heat is also a good reflector of heat.
False
A temperature scale that has 100 degrees between the boiling point and the freezing point of water is the Fahrenheit scale.
False
Air high in the atmosphere that plunges downward tends to cool.
False
Gases don't expand very much when heated.
False
Heat transfer by means of atoms moving from place to place is conduction.
False
Heat transfer by means of electrons colliding with other electrons in a metal is convection.
False
If all the friction could be eliminated in a heat engine, its efficiency would be 100%.
False
A good reflector of heat is a poor absorber of heat.
True
All objects above 0 K radiate energy.
True
Efficiency in a heat engine is increased when there is a greater difference in input and output temperatures.
True
Heat is the energy that moves from one object to another because of a temperature difference.
True
Heat that is transferred to us from the sun is transferred by radiation.
True
It is possible to totally convert a given amount of mechanical energy to heat.
True
Liquids usually expand when heated.
True
Materials that are poor heat conductors are insulators.
True
Sometimes evaporation takes place at the bottom of a liquid. This process is boiling.
True
Systems left alone then to move to a state of great entropy.
True
The amount of heat required to change the temperature of a unit mass of a substance by 1 degree is its specific heat capacity.
True
The average kinetic energy of molecules in a substance is related to temperature.
True
The entropy of a system measures the state of disorder of the system.
True
The rate of cooling an object is proportional to the temperature difference between the object and its surroundings.
True
Water contracts when heated from 0 degrees C to 4 degrees C.
True
When steam changes to water at 100 degrees Celsius, energy is released.
True
When work is done by a system on something else, the temperature of the system decreases.
True
Whenever heat is added to a system, it transforms to an equal amount of some other form of energy.
True
