8 original questions from New Regents. The worksheet, answer key, and browser practice are free.
Independent and Dependent Variables 4 questions
Independent and Dependent Variables
New Regents original practice • Name: ____________________ Date: __________ Show your work for written answers.
The independent variable is deliberately changed. The dependent variable is measured in response. Controlled variables are kept the same.
Question 1
A student changes water temperature and measures how long a sugar cube takes to dissolve. What is the independent variable?
- Sugar cube mass
- Water temperature
- Dissolving time
- Beaker shape
Question 2
A team changes the thickness of insulation around a cup and measures its temperature after 10 minutes. What is the dependent variable?
- Insulation thickness
- Cup volume
- Elapsed time of 10 minutes
- Final temperature
Question 3
A team changes stirring speed to measure its effect on sugar-dissolving time. Identify one condition the team should hold constant and describe how to control it.
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Question 4
One trial uses warmer water and smaller sugar crystals than another. Explain why these two trials cannot determine the effect of temperature alone.
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Comparing Cooling Cups 4 questions
Comparing Cooling Cups
Use the information below to answer the questions.
A team measures temperature drop in water over 10 minutes. All cups contain the same volume of water at the same initial temperature. Room temperature and cup size are held constant.
| Trial | Cup material | Lid | Temperature drop (°C) |
|---|---|---|---|
| 1 | Paper | Off | 12 |
| 2 | Paper | On | 7 |
| 3 | Foam | On | 4 |
Question 5
Which pair isolates the effect of adding a lid?
- 1 and 2
- 1 and 3
- 2 and 3
- No pair does.
Question 6
For a paper cup, by how much did adding a lid reduce the measured temperature drop? Show your calculation.
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Question 7
Describe one new trial to compare foam and paper cups with both lids off. State which original trial to use for the comparison.
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Question 8
Which action best checks whether the difference between trials 1 and 2 is repeatable?
- Measure the temperature of the room only.
- Repeat both trials under the same conditions.
- Change both cups to foam and remove both lids.
- Use a smaller volume in trial 1 than in trial 2.
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