| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.37 |
| Score | 0% | 67% |
__________ and __________ pair to strengthen bones.
vitamin D, magnesium |
|
vitamin D, calcium |
|
iron, calcium |
|
calcium, vitamin A |
Vitamin D helps calcium strengthen bones while also aiding muscle, nerve, and immune system function.
Which of the following is not true about simple magnets?
all of these are untrue |
|
same poles repel each other |
|
opposite poles repel each other |
|
opposite poles attract each other |
Simple magnets have two poles, north and south, and opposite poles attract each other (N attracts S, S attracts N). Likewise, the same pole of two magnets repel (N repels N, S repels S). The Earth has a magnetic field and North and South Poles which enables the use of a magnetic compass to determine direction.
Which of the following is not a base unit in the metric system?
liter |
|
degree Fahrenheit |
|
gram |
|
meter |
The Fahrenheit scale is used for measuring temperature in the British system. The metric system uses the Celsius scale.
Absolute zero is which of the following?
the coldest temperature possible in the universe |
|
the freezing point of oxygen |
|
0°C |
|
the freezing point of hydrogen |
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.
Earth's breathable air is held in which atmospheric layer?
troposphere |
|
stratosphere |
|
mesosphere |
|
thermosphere |
The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.