| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.30 |
| Score | 0% | 66% |
The angle of reflection is equal to which the following?
refractive index |
|
angle of incidence |
|
focal point |
|
90° |
The law of reflection specifies how waves, including light waves, bounce off of surfaces. Specifically, the angle of incidence of the approaching wave is equal to the angle of reflection of the reflected wave as measured from a line perpendicular (90°) to the surface.
Herbivores are __________ that subsist on producers like plants and fungus.
scavengers |
|
secondary consumers |
|
tertiary consumers |
|
primary consumers |
Primary consumers (herbivores) subsist on producers like plants and fungus. Examples are grasshoppers, cows, and plankton.
Which of blood component fights infection?
plasma |
|
platelets |
|
white blood cells |
|
red blood cells |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
Stratus clouds are __________clouds characterized by horizontal layering with a broad flat base.
high-altitude |
|
low-altitude |
|
mid-altitude |
|
all-altitude |
Clouds are categorized based on their shape, size, and altitude. Stratus clouds are low-altitude clouds characterized by horizontal layering with a broad flat base. When stratus clouds occur on the ground the result is fog.
Absolute zero is which of the following?
the freezing point of hydrogen |
|
0°C |
|
the freezing point of oxygen |
|
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.