1.2 Review CC Question Preview (ID: 43460)


Scientific Investigations. TEACHERS: click here for quick copy question ID numbers.

Which description here characterizes an experiment?
a) observation of plants or animals in their natural environment
b) conducting of an organized procedure to study something under controlled conditions
c) use of physical or mathematical representation of an object or process
d) collection of data from the unregulated world for comparative purposes

On the following list, which procedure would not be included as part of a valid scientific experiment?
a) precise observations
b) organized procedures
c) uncontrolled variables
d) controlled surroundings

Raul wants to investigate how the angle of a ramp affects the speed of an object rolling down the ramp. He can conduct his investigation in a number of different ways. Which investigation should he perform?
a) perform an experiment in a lab in which the angle of the ramp is controlled and the speed of a rolling cart is measured
b) observe different bicyclists riding down hills of varying steepness
c) record the time it takes one bicyclist to ride down hills of varying steepness
d) observe video of various objects rolling down hills and estimate the angle of the hill and the speed of the object

Hillary is dropping objects that are the same volume. She wants to investigate how an object’s mass affects the average speed at which it travels when dropped, until it hits the ground. Which variable must Hillary change during the experiment?
a) the timer
b) the drop height
c) the place where she drops it
d) the mass of the object

In chemistry, scientists classify some substances as bases. The following are all characteristics of bases. Which observation can you make about a base using the senses alone?
a) has a pH greater than that of pure water
b) has a density greater than that of pure water
c) feels slippery to the touch
d) conducts an electrical current when dissolved in water

Any good scientific investigation should include a large amount of trials, controlled conditions, and which of the following?
a) It must be able to be replicated by other scientists.
b) It must be conducted in a big lab.
c) It must be run by a university scientist.
d) It must be done with expensive equipment.

Which statement is a hypothesis?
a) Sample X has a greater mass than sample Y.
b) There are more than 100 elements in the periodic table.
c) We have found that bean seeds sprout faster than corn seeds.
d) I think bean seeds that receive 10 mL of water a day will sprout faster than bean seeds that receive 5 mL of water a day.

Two students conduct the same experiment, but they get different results. What should the students do next?
a) Both students should throw out their data and start over.
b) The students should check their procedure and tools for sources of error.
c) The students should compare data with other students and then use the data from the student who was closest to the rest of th
d) The students should find the average of each data set and each report the average data.

Which of the following is a true statement about any hypothesis?
a) It must communicate the conclusions of the experiment.
b) It is not valuable if it is not supported by the results of the experiment.
c) It must be testable using an investigation.
d) It should describe the experiment set-up, variables, and testing methods.

Which of the following is NOT a true statement about any hypothesis?
a) It must communicate the conclusions of the experiment.
b) It must be testable using an investigation.
c) It should be a statement that includes an explanation.
d) It should be possible to determine the variables from the hypothesis.

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