| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.22 |
| Score | 0% | 64% |
Changes to an object's speed or direction of motion are caused by which of the following?
power |
|
kinetic energy |
|
a force |
|
work |
Force is applied to change an object's speed or direction of motion.
The connective tissue that connects bones to other bones at joints is called:
tendons |
|
ligaments |
|
cartilage |
|
knuckles |
Tough fibrous cords of connective tissue called tendons connect muscles to the skeleton while another type of connective tissue called ligaments connect bones to other bones at joints (elbow, knee, fingers, spinal column).
Which of the following temperatures is least like the others?
32°F |
|
0K |
|
-273°C |
|
absolute zero |
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.
Which of the following does not filter air as part of the respiratory system?
pharynx |
|
epiglottis |
|
trachea |
|
nasal cavity |
After air enters through the nose, it passes through the nasal cavity which filters, moistens, and warms it. Further filtering takes place in the pharynx, which also helps protect against infection, and then in the trachea which is just past the epiglottis which prevents food from entering the airway.
The hottest of Earth's atmospheric layers is which of the following?
mesosphere |
|
troposphere |
|
stratosphere |
|
thermosphere |
Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.