Scientific Method: Question Preview (ID: 20437)

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Which of the following questions CANNOT be answered by science?
a) How do birds fly? b) Is this a good song? c) What is an atom? d) How does a clock work?
As temperature drops to the dew point, clouds form in the atmosphere, and dew forms on ground surfaces. A scientist proposes that adding more water molecules to the atmosphere will change the dew point. This proposal is —
a) an invalid observation b) a valid hypothesis c) an invalid problem d) a valid conclusion
Objects of the same mass but of different sizes and shapes were dropped from a given height. Their rates of free fall were measured and recorded. Which of the following is most likely the question this experiment was designed to answer?
a) How does height affect the force of gravity? b) How does gravity affect objects of different densities? c) How do mass and weight affect falling objects? d) How do size and shape affect an object’s rate of free fall?
In an investigation 10,000 dung beetles were examined for the presence of parasites. The data showed that about 5% of the beetles had parasites. The results are —
a) invalid because only dung beetles were examined b) unsupported because the parasite population was small c) erroneous because more beetles should have had parasites d) valid because the sample size was sufficient for accuracy
Ten different types of culture media were inoculated with the same strain of bacteria and incubated at the same temperature. Nine of the cultures grew. Which of these conclusions can be drawn from this information?
a) The media used in the experiment are all capable of sustaining bacterial growth. b) The temperature varied greatly during the experiment. c) Only the culture that failed to grow bacteria was inoculated properly. d) One of the media lacked the nutrients needed for the bacteria to grow.
Which of these is a hypothesis that can be tested through experimentation?
a) Bacterial growth increases exponentially as temperature increases. b) A fish’s ability to taste food is affected by the clarity of aquarium water c) Tadpoles’ fear of carnivorous insect larvae increases as the tadpoles age. d) The number of times a dog wags its tail indicates how content the dog is.
In order to be valid, an experiment can only
a) test one variable at a time b) test four variables at a time c) have two controls d) have no controls
The smell of an ammonia solution used to clean a floor can quickly be detected throughout a house. Scientists explain this phenomenon by theorizing that gas molecules from the ammonia are in continuous random high-speed motion, drifting rapidly and p
a) Scientists have observed tiny smoke particles moved by unseen particles in a rapid, irregular fashion. b) Scientists have unanimously agreed on this theory since Thomas Graham’s experiments in the 1820s. c) The possibility of another theory being formed to explain the phenomenon as well is very remote. d) Reason, as opposed to experimentation, is superior to any explanation found through chemical testing.
The independent variable in an experiment is the
a) variable that is being manipulated b) variable that results from a manipulation c) variable that is not tested d) variable that remains constant
The dependent variable in an experiment is the
a) variable that is being manipulated b) variable that results from a manipulation c) variable that is not tested d) variable that remains constant
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