| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.70 |
| Score | 0% | 54% |
Which of the following would you find in the side view mirror of a car?
concave lens |
|
convex mirror |
|
convex lens |
|
concave mirror |
A concave (or converging) mirror bulges inward and focuses reflected light on the mirror's focal point where the mirror's angles of incidence converge. In contrast, a convex (or diverging) mirror bulges outward and diffuses the light waves that strike it. A common use of a concave mirror is in a reflecting telescope, a common use of a convex mirror is in the side view mirror of a car.
Which of the following temperatures is least like the others?
-273°C |
|
0K |
|
absolute zero |
|
32°F |
Absolute zero is the coldest possible temperature in the universe. In the Kelvin scale, absolute zero is 0K and in the Celsius scale it is -273°C.
The process of diffusion allows __________ to exchange oxygen, carbon dioxide, nutrients, and waste between blood and the body's cells.
arteries |
|
capillaries |
|
veins |
|
red blood cells |
Capillaries are small thin-walled vessels that permit the exchange of oxygen, carbon dioxide, nutrients, and waste between blood and the body's cells. This process of exchange is called diffusion.
Poor balance could indicate an issue with which part of the nervous system?
medulla |
|
cerebrum |
|
spinal cord |
|
cerebellum |
The cerebellum is a large cluster of nerves at the base of the brain that's responsible for balance, movement, and muscle coordination.
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
compound |
|
atom |
|
element |
|
molecule |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.