7th grade Chapter 2

The metric system of measurement is based on the number 

• 1.
• 12.
• 10.
• 100.

The basic unit of length in the metric system is the 

• foot. 
• meter.
• mile.
• kilometer.

If scientists cannot obtain exact numbers, they should rely on a(n)  

• calculation.
• estimate. 
• guess.
• assumption.

To determine how close to the true value an experimental value is, you would use    

• a precision calculation.
• a median.
• significant figures.
• a percent error calculation.

The horizontal axis of a graph runs 

• left to right. 
• up and down.
• vertically.
• diagonally.

A line graph in which the data points do not fall along a straight line is called a 

•  linear graph.
• nonlinear graph.
• circle graph. 
•  bar graph.

What are some reasonable safety precautions for field investigations? 

• None; there are no hazards in the field. 
• Always wear goggles and aprons.
• Be prepared and use common sense. 
• Always go into the field alone.

When preparing for a laboratory investigation, if any of the directions are unclear you should  

• ask a classmate to explain.
• ask your teacher to explain.
• go ahead and begin the lab.
• skip the part of the lab that is not clear.

A group of parts that work together is called a 

• technology.
• system. 
• process.
• feedback.

The middle number in a set of data is the

• mean.
• median.
• mode.
• significant figure.