Principles of Science & Matter & Energy Exam
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Last updated over 3 years ago
19 questions
Please read and answer each question carefully. You may use open book & open notes for this test. You will not get extended time. You must complete the test in one sitting. You will not be able to open it up to continue work once you have closed it.
A pulmonologist hears complaints from a few of his patients that they feel tired and fatigued after wearing an N95 mask for hours at a time and believe that their blood oxygen levels are lowered. The doctor, having to wear a mask all day himself, does not believe this is true, but decides to test it.
He finds a group of 50 volunteers for his study. He assigns 25 of them to wear an N95 mask while walking at a brisk pace of 5km/hr on a treadmill for 30 minutes. The other 25 will be unmasked while performing the same exercise.
Following the study, he finds that the average oxygen saturation level of the masked group is 98.1%, while the average oxygen saturation level of the unmasked group is 98.3%.
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What was the hypothesis in this study?
What was the hypothesis in this study?
1
Looking at the experimental design, the independent variable would be the _____________, while the dependent variable was the __________________.
Looking at the experimental design, the independent variable would be the _____________, while the dependent variable was the __________________.
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What was the control group in this experiment?
What was the control group in this experiment?
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What was a controlled variable in this experiment? Select all that apply.
What was a controlled variable in this experiment? Select all that apply.
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How could this experiment be changed to reduce the margin of error?
How could this experiment be changed to reduce the margin of error?
1
What final step should this doctor take before sharing his conclusions with his patients?
What final step should this doctor take before sharing his conclusions with his patients?
1
A company develops study to evaluate the effectiveness of a new sports drink in relieving cramping and fatigue after an intensive workout. One group of people is given the new sports drink, while the other group is given a drink that looks and tastes like a sports drink, but is just flavored water. After the workout, doctors will evaluate each group without knowing what kind of drink they received.What type of experiment is this?
A company develops study to evaluate the effectiveness of a new sports drink in relieving cramping and fatigue after an intensive workout. One group of people is given the new sports drink, while the other group is given a drink that looks and tastes like a sports drink, but is just flavored water. After the workout, doctors will evaluate each group without knowing what kind of drink they received.
What type of experiment is this?
1
What is the difference between correlation and causation
What is the difference between correlation and causation
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Which condition, if true, would result in a claim being classified as pseudoscience?
Which condition, if true, would result in a claim being classified as pseudoscience?
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What is always the first step of the scientific method?
What is always the first step of the scientific method?
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Where do plants get most of their mass from as they grow from seeds?
Where do plants get most of their mass from as they grow from seeds?
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What law states that some energy is lost during each transformation in a food chain?
What law states that some energy is lost during each transformation in a food chain?
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If 2000 kcal/m2/year of primary production occurs at the producer level of this food web, how much energy will be present for the secondary consumer level?
If 2000 kcal/m2/year of primary production occurs at the producer level of this food web, how much energy will be present for the secondary consumer level?
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What form of electromagnetic radiation is released by the sun and used by plants to perform photosynthesis?
What form of electromagnetic radiation is released by the sun and used by plants to perform photosynthesis?
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The gasoline that is used to power cars contains what kind of energy?
The gasoline that is used to power cars contains what kind of energy?
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Jan Ingenhousz discovered one of the components of photosynthesis when he observed bubbles of oxygen being released from aquatic plants. What environmental condition did the plants need to do this?
Jan Ingenhousz discovered one of the components of photosynthesis when he observed bubbles of oxygen being released from aquatic plants. What environmental condition did the plants need to do this?
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What substance was discovered when Joseph Priestly performed themouse in a jar experiment?
What substance was discovered when Joseph Priestly performed the
mouse in a jar experiment?
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Air is made of nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and water (H2O). What do these all have in common?
Air is made of nitrogen (N2), oxygen (O2), carbon dioxide (CO2), and water (H2O). What do these all have in common?
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Matter is defined as any substance that … (select two)
Matter is defined as any substance that … (select two)