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1A meteorologist reports that the air is holding close to the maximum amount of water vapor it can hold at the current temperature. This describes:
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Answer: high relative humidity
Relative humidity measures how close the air is to saturation; air nearing its maximum water vapor capacity has high relative humidity.
2A liquid is heated at sea level and its temperature stops rising at 100 degrees Celsius even though heating continues. What is the best explanation for this?
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Answer: The liquid has reached its boiling point and added energy is being used for the phase change
At the boiling point, additional thermal energy is used to overcome intermolecular forces during vaporization rather than increasing particle speed, so temperature remains constant until the phase change is complete.
3According to Newton's second law, if the net force applied to an object doubles while its mass stays the same, what happens to its acceleration?
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Answer: It doubles
Newton's second law states that acceleration equals net force divided by mass; if force doubles and mass is unchanged, acceleration also doubles.
4An object moves a distance of 24 meters in 8 seconds at a constant rate. What is its speed?
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Answer: 3 m/s
Speed = distance / time = 24 m / 8 s = 3 m/s. Wrong choices add, multiply, or subtract the values instead of dividing.
5Convert 4 liters to milliliters. (1 liter = 1000 milliliter)
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Answer: 4000 milliliters
Multiply by 1000: 4 x 1000 = 4000 milliliters.
6An object made of a certain material has a mass of 54 grams and a volume of 9 cubic centimeters. A second object of the same material has a volume of 6 cubic centimeters. What is the mass of the second object?
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Answer: 36 grams
Density = 54/9 = 6 g/cm3, the same for both objects. Mass of the second = 6 x 6 = 36 g.
7In three trials, a student measured values of 33, 35, and 40 millimeters. What is the average (mean) of these measurements?
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Answer: 36
Mean = (33 + 35 + 40) / 3 = 108 / 3 = 36 mm.
8A city engineer must design a storm drain system that can handle a 100-year flood while keeping construction costs below $5 million. Which factor represents a criterion rather than a constraint?
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Answer: Handling a 100-year flood event
Handling the flood event is a performance requirement (criterion), while cost and legal limits act as constraints on the design.
9A city plans to build a pedestrian bridge and specifies it must support a load of 10,000 pounds, cost under $2 million, and be completed within one year. These specifications are examples of:
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Answer: Criteria and constraints
Load capacity, cost, and time limits are specific criteria (performance requirements) and constraints (limitations) for the design.
10Convert 4 kilograms to grams. (1 kilogram = 1000 gram)
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Answer: 4000 grams
Multiply by 1000: 4 x 1000 = 4000 grams.