Scientific Measurement — Unit test Answers

Which of the following is likely to be the most valid source of information about pollution?a.a website supported by manufacturing companiesb.an internal report by the Environmental Protection Agency (EPA)c.a website supported by environmental groupsd.a television news program

What is 1550 dm expressed in hectometers?a.1550000 hmb.155.0 hmc.15.50 hmd.1.55 hm

A scientific theory can never be disproven.

Which of the following is not an advantage of using the metric system?a.The basic units of measurement are related to each other.b.The units are based on multiples of ten.c.The units are used internationally.d.It was designed in France in 1791.

Scientific models can never be changed.

Which of the following is an inference? a. The flower is pink. b. Vinegar has a pungent aroma. c. A dog barks. d. A cup with steam coming from it will be hot to the touch. Please select the best answer from the choices provided

Which of the following statements about idea models is not true?a.Idea models depict a concept.b.Idea models are typically used to predict natural disasters.c.Idea models are typically in the form of a graph or equation.d.Idea models are used to show the relationship between variables.

Judging and evaluating advertisements requires critical thinking because _______. a.advertisements can contain confusing, misleading informationb.all advertisements contain false informationc.advertisers always want to convince consumers to buy unnecessary itemsd.truth in advertising laws ensure the accuracy of information in advertisements

Scientists best apply critical thinking in their work through _______.a.the scientific methodb.observationc.hypothesesd.experimentation

An independent variable isa.directly changed by the experimenter.b.manipulated by changes to the dependent variable.c.a variable that is kept constant.d.a variable that is used as a control.

There is no difference between the question and hypothesis steps of scientific inquiry.

Which of the following is the SI unit used to measure temperature?a.kilogramb.literc.meterd.Kelvin

What is the main purpose of scientific models?a.The main purpose of models is to have a physical object to which to refer.b.The main purpose of models is to represent observations.c.The main purpose of models is to study systems that no longer exist.d.The main purpose of models is to gain a better understanding of the world.

How many significant figures are in the measurement 1.050 L?a.1b.2c.3d.4

Scientific experiments are specially designed to test explanations for an observed phenomenon. A student decides to conduct an experiment to determine the effect that the amount of time spent in the sunlight has on the overall growth of a plant. The student will conduct the experiment using two identical plants that will only spend different amounts of time in the sunlight. All other aspects needed for growth will remain identical for each. In the experiment described, what would the amount of water given to each plant be considered? a. an observation b. a dependent variable c. an independent variable d. a control or constant Please select the best answer from the choices provided

Which of the following values is the largest?a.50000 mmb.0.5 kmc.50 md.5000 cm

Scientists utilize models for a variety of different purposes, but each type of scientific model has limitations. What might be a limitation of existing solar system models? a. They are not based on experimentation. b. They are used for prediction. c. They cannot be changed. d. They are based on current knowledge. Please select the best answer from the choices provided

A statement that can be proven by observation or measurement is known as a(n):a.opinionb.valuec.factd.belief

A hypothesis is _______.a.a proposed solution to observed phenomenab.a question derived from observed phenomenac.a testable explanation for observed phenomenad.generated as the final step in scientific inquiry

Scientific questions must be _______.a.based on scientific theoriesb.generalc.biasedd.testable