| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.62 |
| Score | 0% | 72% |
The transfer of heat by the circulation or movement of the heated parts of a liquid or gas is called:
diffusion |
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conduction |
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convection |
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radiation |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas. Examples of heat transfer by convection include water coming to a boil on a stove, ice melting, and steam from a cup of coffee.
Water freezing or boiling is an example of which of the following?
cooling |
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phase transition |
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heating |
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sublimation |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
The heat from the Sun traveling to Earth is an example of which of the following?
radiation |
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electricity |
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convection |
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conduction |
Radiation occurs when electromagnetic waves transmit heat. An example is the heat from the Sun as it travels to Earth.
Within DNA, a variety of a particular gene is called a(n):
chromosome |
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allele |
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heterozygous |
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homozygous |
The gene is the base unit of inheritance and is contained within DNA. A gene may come in several varieties (alleles) and there are a pair of alleles for every gene. If the alleles are alike, a person is homozygous for that gene. If the alleles are different, heterozygous.
The rate of vibration of sound is called:
amplitude |
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frequency |
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volume |
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period |
The rate of vibration of sound is called frequency and is measured in hertz (Hz). One hertz is one repetition per second and sounds with high frequency have a higher pitch than sounds with lower frequency. Humans can hear sounds in the range of 20 Hz to 20 kHz.