| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.70 |
| Score | 0% | 54% |
Which of the following is not true about simple magnets?
all of these are untrue |
|
opposite poles attract each other |
|
same poles repel each other |
|
opposite poles repel each other |
Simple magnets have two poles, north and south, and opposite poles attract each other (N attracts S, S attracts N). Likewise, the same pole of two magnets repel (N repels N, S repels S). The Earth has a magnetic field and North and South Poles which enables the use of a magnetic compass to determine direction.
Convert -20C° to F°.
-4 |
|
-36 |
|
78 |
|
36 |
To convert from C° to F° use:
\(F° = {9 \over 5}C° + 32\)
\(F° = {9 \over 5}(-20) + 32\)
\(F° = {-180 \over 5} + 32\)
\(F° = -36 + 32 = -4\)
Examples of secondary consumers include:
plankton |
|
chickens |
|
grasshoppers |
|
wolves |
Secondary consumers (carnivores) subsist mainly on primary consumers. Omnivores are secondary consumers that also eat producers. Examples are rats, fish, and chickens.
Which of the following describes the Earth's outer core?
solid |
|
makes up most of the Earth's volume |
|
primarily solid |
|
liquid |
The Earth's core is divided into the liquid outer core (1,430 miles or 2,300 km radius) and the solid inner core (745 miles or 1,200 km radius).
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
results |
|
reactants |
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products |
|
side effects |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).