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Sample Practice Test Questions
Solve for a:
2a + 2 < 8 - 8a
To solve this equation, repeatedly do the same thing to both sides of the equation until the variable is isolated on one side of the < sign and the answer on the other.
2a + 2 < 8 - 8a
2a < 8 - 8a - 2
2a + 8a < 8 - 2
10a < 6
a < \( \frac{6}{10} \)
a < \(\frac{3}{5}\)
Changes to an object's speed or direction of motion are caused by which of the following?
a force
Force is applied to change an object's speed or direction of motion.
Which of the following describes the Earth's mantle?
all of these
Mantle makes up 84% of the Earth's volume and has an average thickness of approximately 1,800 miles (2,900 km). It is dense, hot, and primarily solid although in places it behaves more like a viscous fluid as the plates of the upper mantle and crust gradually "float" along its circumference.
The electrical potential difference between two points is called:
voltage
Voltage (V) is the electrical potential difference between two points. Electrons will flow as current from areas of high potential (concentration of electrons) to areas of low potential. Voltage and current are directly proportional in that the higher the voltage applied to a conductor the higher the current that will result.
Which of the following represents the force a surface exerts when an object presses against it?
normal force
Normal force (FN) represents the force a surface exerts when an object presses against it.
The ignition coil is a(n):
step-up transformer
The ignition coil steps up the 12 volts available from the battery or alternator to a voltage of 30,000 or more volts at the spark plug. Converting a lower voltage input into a higher voltage output makes the ignition coil a step-up transformer.
Which of the following is not true about a line drop?
it is addressed by raising current and lowering voltage across the ransmission line
Electricity is delivered from power stations to customers as AC because it provides a more efficient way to transport electricity over long distances. A line drop is a decrease in voltage between two points on an electrical transmission line due to resistance in the line. A lower current and higher voltage across the line will help compensate for the line drop.
A trapezoid is a quadrilateral with one set of __________ sides.
parallel
A trapezoid is a quadrilateral with one set of parallel sides.