| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.55 |
| Score | 0% | 71% |
Carbohydrates are found in:
animal sources |
|
sugars and starches |
|
vegetable oils |
|
food additives |
Carbohydrates are major sources of energy for the body and are found in sugars (fruit, cane sugar, beets) and starches (bread, rice, potatoes, pasta).
Water coming to a boil on a stove, ice melting, and steam from a cup of coffee are all examples of which of the following?
conduction |
|
reflection |
|
radiation |
|
convection |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas.
Cellular fermentation takes place:
in the presence of oxygen |
|
anaerobically |
|
in plant cells |
|
aerobically |
If no oxygen is present, cellular respiration is anaerobic and will result in fermentation where either lactic acid or alcohol is used instead of oxygen.
Which of the following is not true of light waves?
are electromagnetic waves |
|
can travel through a vacuum |
|
travel faster than sound waves |
|
are mechanical waves |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.
Which of the following is sedimentary rock?
basalt |
|
obsidian |
|
sandstone |
|
slate |
The Earth's rocks fall into three categories based on how they're formed. Igneous rock (granite, basalt, obsidian) is formed from the hardening of molten rock (lava), sedimentary rock (shale, sandstone, coal) is formed by the gradual despositing and cementing of rock and other debris, and metamorphic rock (marble, slate, quartzite) which is formed when existing rock is altered though pressure, temperature, or chemical processes.