| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.90 |
| Score | 0% | 58% |
Absolute zero is which of the following?
the freezing point of oxygen |
|
0°C |
|
the freezing point of hydrogen |
|
the coldest temperature possible in the universe |
In contrast to the Celsius scale (measured in degrees centigrade) that fixes 0° at the freezing point of water and the Fahrenheit scale that uses 32°, the Kelvin scale fixes 0 at absolute zero (-273°C) which is the lowest temperature possible in the universe.
50°F is how many °C?
-10 |
|
122 |
|
10 |
|
58 |
The formula to convert from F° to C° is:
\(C° = {5 \over 9} (F° - 32)\)
plugging in our values gives:
\(C° = {5 \over 9} (50 - 32)\)
\(C° = {5 \over 9} (18)\)
\(C° = {90 \over 9}\)
\(C° = 10\)
Sound travels fastest through which of the following media?
vacuum |
|
water |
|
metal |
|
air |
The speed of a sound wave will vary with the medium. Sound travels fastest through media that has particles that are very close together, like metal. Thus, it travels faster through water than through air and doesn't travel at all through a vacuum (there are no particles in empty space to vibrate).
Which of the following is true about species groups?
a community is made up of a group of populations |
|
an ecosystem is a biological population |
|
a biome is a made up of a group of biospheres |
|
a population is made up of a group of communities |
A population is a group of organisms of the same species who live in the same area at the same time. A community is a group of populations living and interacting with each other in an area.
__________ is caused by a lack of Vitamin C.
anemia |
|
diabetes |
|
shingles |
|
scurvy |
Scurvy is a difficiency disease caused by a lack of Vitamin C in the diet.