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1Convert 8 meters to centimeters. (1 meter = 100 centimeter)
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Answer: 800 centimeters
Multiply by 100: 8 x 100 = 800 centimeters.
2When it is winter in New York (Northern Hemisphere), what season is it in Australia (Southern Hemisphere)?
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Answer: summer
Because the hemispheres tilt toward or away from the sun oppositely, when the Northern Hemisphere experiences winter, the Southern Hemisphere experiences summer.
3A group tests three bridge designs made of the same material but different shapes to see which holds the most weight. What is the dependent variable?
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Answer: The maximum weight held before failure
The dependent variable is the outcome measured in response to the changed variable; here it is the weight the bridge holds.
4An object has a mass of 9 grams and a volume of 3 cubic centimeters. What is its density?
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Answer: 3 g/cm3
Density = mass / volume = 9 g / 3 cm3 = 3 g/cm3. Distractors come from adding, multiplying, or confusing the given values.
5An object has a mass of 54 grams and a volume of 6 cubic centimeters. What is its density?
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Answer: 9 g/cm3
Density = mass / volume = 54 g / 6 cm3 = 9 g/cm3. Distractors come from adding, multiplying, or confusing the given values.
6An object has a mass of 14 grams and a volume of 2 cubic centimeters. What is its density?
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Answer: 7 g/cm3
Density = mass / volume = 14 g / 2 cm3 = 7 g/cm3. Distractors come from adding, multiplying, or confusing the given values.
7An object has a mass of 18 grams and a volume of 9 cubic centimeters. What is its density?
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Answer: 2 g/cm3
Density = mass / volume = 18 g / 9 cm3 = 2 g/cm3. Distractors come from adding, multiplying, or confusing the given values.
8Which structure controls the activities of a cell and contains its genetic material?
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Answer: Nucleus
The nucleus houses genetic material and directs cell activities. The membrane controls what enters and leaves, cytoplasm fills the cell, and the cell wall supports plant cells.
9Two students push on opposite sides of a box. One pushes with 40 N to the right, and the other pushes with 25 N to the left. What is the net force on the box?
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Answer: 15 N to the right
Net force is found by subtracting opposing forces: 40 N to the right minus 25 N to the left leaves a net force of 15 N to the right.
10An 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 5 cubic centimeters. What is the mass of the second object?
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Answer: 30 grams
Density = 54/9 = 6 g/cm3, the same for both objects. Mass of the second = 6 x 5 = 30 g.