| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?
sound radiation |
|
Doppler effect |
|
reflection |
|
refraction |
The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.
In taxonomy, domains are the broadest classification of life. How many domains are there?
6 |
|
3 |
|
5 |
|
dozens |
The broadest classification of life splits all organisms into three groups called domains. The three domains of life are bacteria, archaea and eukaryota.
A dominant trait will be expressed when paired with:
a gene |
|
a chromosome |
|
a dominant trait |
|
a recessive trait |
The traits represented by genes are inherited independently of each other (one from the male and one from the female gamete) and a trait can be dominant or recessive. A dominant trait will be expressed when paired with a recessive trait while two copies of a recessive trait (one from each parent) must be present for the recessive trait to be expressed.
The energy posessed by a thrown baseball is an example of what kind of energy?
transitional |
|
gravitational |
|
kinetic |
|
potential |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
atom |
|
molecule |
|
compound |
|
element |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.