| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.12 |
| Score | 0% | 62% |
Which of the following is not a method of heat transfer?
radiation |
|
convection |
|
conduction |
|
reflection |
Heat is always transferred from warmer to cooler environments through conduction, convection, or radiation.
212°F is how many °C?
100 |
|
\(135 {5 \over 9}\) |
|
-100 |
|
0 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (212 - 32)\)
\(C° = {5 \over 9} (180) = {{180 \times 5} \over 9}\)
\(C° = {900 \over 9}\)
\(C° = 100\)
Which of the following does not represent the freezing point of water?
273K |
|
0°F |
|
0°C |
|
32°F |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
Earth's history is divided into time periods, which of these is the shortest time period?
period |
|
age |
|
epoch |
|
eon |
The Earth is approximately 4.6 billion years old and its history is divided into time periods based on the events that took place and the forms of life that were dominant during those periods. The largest graduation of time is the eon and each eon is subdivided into eras, eras into periods, periods into epochs, and epochs into ages.
The transfer of heat by the circulation or movement of the heated parts of a liquid or gas is called:
conduction |
|
diffusion |
|
convection |
|
radiation |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas. Examples of heat transfer by convection include water coming to a boil on a stove, ice melting, and steam from a cup of coffee.