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1A liquid started at 15 degrees C. During an experiment its temperature rose by 8 degrees C. What was the final temperature?
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Answer: 23 degrees C
The temperature rose by 8 degrees, so the final temperature is 15 + 8 = 23 degrees C.
2Rising global temperatures linked to increased greenhouse gases can affect ecosystems by:
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Answer: Shifting the ranges where species can survive and disrupting existing food webs
Rising temperatures can shift habitable ranges for species, disrupting established food webs and ecosystem balance.
3In three trials, a student measured values of 15, 35, and 34 millimeters. What is the average (mean) of these measurements?
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Answer: 28
Mean = (15 + 35 + 34) / 3 = 84 / 3 = 28 mm.
4Convert 6 liters to milliliters. (1 liter = 1000 milliliter)
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Answer: 6000 milliliters
Multiply by 1000: 6 x 1000 = 6000 milliliters.
5Which of the following best describes the role of research in the engineering design process?
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Answer: It helps engineers learn from existing solutions before developing new ones
Researching existing solutions and background information helps engineers avoid repeating past mistakes and informs better design choices.
6A student wants to separate a mixture of sand and salt water. Which sequence of methods would successfully separate all three substances (sand, salt, and water)?
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Answer: Filtration, then evaporation
Filtration removes the insoluble sand from the salt water, and evaporation of the remaining liquid leaves behind the dissolved salt.
7Which best describes the Sun?
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Answer: A star at the center of our solar system
The Sun is a star, an enormous ball of hot gas, and its gravity holds the solar system together.
8An object has a mass of 40 grams and a volume of 10 cubic centimeters. What is its density?
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Answer: 4 g/cm3
Density = mass / volume = 40 g / 10 cm3 = 4 g/cm3. Distractors come from adding, multiplying, or confusing the given values.
9Which organ system breaks down food into nutrients the body can absorb?
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Answer: Digestive system
The digestive system mechanically and chemically breaks down food so nutrients can be absorbed into the bloodstream.
10Which practice best represents sustainable use of forest resources?
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Answer: Selective logging combined with replanting trees
Selective logging paired with replanting allows forest resources to regenerate, supporting long-term ecosystem health.