Topic Test Answers

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

Which of the following is not one of the three principles from which the metric system is based? a. There is one unit for each measurable quantity. b. Prefixes are used to signify multiples of each unit. c. Metric measurements cannot be converted to any other form of measurement. d. The basic units are related to each other. Please select the best answer from the choices provided

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

Following proper safety guidelines _______.a.minimizes the chance of accidents occurring in labb.involves using a fire extinguisherc.prevents accidents from occurring in labd.requires using a safety shower

Which of the following is an observation and not an inference?a.A cup with steam coming from it will be hot to the touch.b.Dark clouds in the sky will mean rain later in the afternoon.c.Bubbles form when two chemicals are mixed together.d.A plastic bag moving along the ground is being pushed by the wind.

The main purpose of models is to gain a better understanding of the world.

Which of the following types of models is most likely to be used to predict earthquakes?a.idea modelb.physical modelc.computer modeld.none of the above

Safety equipment like fire extinguishers and fire blankets are used to prevent accidents.

Scientists use critical thinking skills throughout the process of research or experimentation. A student notices that their energy level always seems to decrease when they drink soda, but they seem to have more energy when they don’t drink soda. The student decides to conduct an experiment to determine if their soda intake really does have an effect on their energy level. What critical thinking step has the student just completed in the situation described above? a. Asking a question b. Evaluating a promotional claim c. Adjusting a conclusion d. Determining a logical conclusion Please select the best answer from the choices provided

When conducting scientific research or experimentation, researchers carefully analyze and evaluate results to determine a valid conclusion. A scientist conducts an experiment to determine how different brands of fish food affect tropical fish growth. The scientist determines that all of their fish grow better when fed a specific brand of fish food. Why would it be important to question the results of this experiment? a. it may be incorrect b. it may be based on opinions c. information can be biased d. all of the above Please select the best answer from the choices provided

How many significant figures are in the measurement 0.020 km?a.1b.2c.3d.4

Models need to be changed when _______.a.they are based on experimental datab.scientific understanding changes c.they represent a phenomenond.they are designed to answer a question

What is 0.25 kilometers expressed in centimeters?a.25000 cmb.250 cmc.0.000025 cmd.2500 cm

There is no simple way to determine whether a website has an editorial process to evaluate the factual accuracy of the information presented.

Scientific theories are subject to change.