Savvas 8th Grade Chapter 2 Review (Lessons 1-5)

Last updated almost 3 years ago

41 questions

1

Library

Savvas 8th Grade Chapter 2 Review (Lessons 1-5)

Last updated almost 3 years ago

41 questions

1

Density is the measure of how much_______  is contained in a given
volume.

1

A good technique for finding the volume of an irregular solid is _______ .

1

There are 1,000 meters in a _______. 

1

Measurements for time and _______  are the only measurements that do
not strictly follow the metric system.

1

The _______  variable is the variable that responds to changes.

1

Scientists study graphs to help them identify_______  in the data.

1

A line graph in which the data points yield a straight line is a(n)_______ 
graph.

1

Density is the measure of how much_______  is contained in a given
volume.

A good technique for finding the volume of an irregular solid is _______ .

There are 1,000 meters in a _______. 

Measurements for time and _______  are the only measurements that do
not strictly follow the metric system.

The _______  variable is the variable that responds to changes.

Scientists study graphs to help them identify_______  in the data.

A line graph in which the data points yield a straight line is a(n)_______ 
graph.

Because it is affected by gravity, an object’s mass would be less on the moon, where there is less gravity.

True

False

Your heart pumping faster when you exercise is an example of input.

True

False

The basic SI unit for the volume of a rectangular solid is the liter.

True

False

Scientists may make assumptions to simplify a model.

True

False

The output of a toaster is electricity.

True

False

All models are physical objects.

True

False

Density determines whether an object will float or sink in water.

True

False

The basic unit for measuring mass is the kilogram.

True

False

A student on the archery team gets all her arrows in the same spot on the target. They are all outside the bull’s eye. Which best describes her results?

both accurate and precise

precise but not accurate

accurate but not precise

neither precise nor accurate

A student added the measurements 36.67 g and 4.1 g. Which of the following expresses the sum with the correct number of significant figures?

40.7 g

40.77 g

40.8 g

41 g

Which of the following shows the mean with the correct number of significant figures for the numbers 15.6, 14.1, 7.7, 12.9, 12.9?

12

12.6

12.64

12.7

A student calculated the density of tin to be 7.20 g/mL. The actual density of tin is 7.29 g/mL. Which of the following is his percent error?

0.01 percent

0.09 percent

1.23 percent

1.25 percent

Scientists test their ideas about things they cannot observe directly by building.

models

theories

systems

evidence

Models can help scientists understand a system’s

assumptions 

investigations

processes

theories

Input, output, and process are parts of a(n)

system

assumption

model

hypothesis

Scientists may use a computer to keep track of the variables in a complex

model

program

feedback

system

What is the first safety step you should take before an investigation?

Clean and organize your work area.

Make sure you know its safety symbols.

Put on an apron and goggles.

Wash your hands

What are the first two steps you should follow in case of a fire?

activate the fire alarm, then leave the building.

activate the fire alarm, then put out the fire.

alert your teacher, then follow directions quickly.

Put out the fire, then call 911.

Which of the following safety procedures should you always follow in the field?

wear goggles

wear sandals

work with a partner 

keep a field notebook 

Any area outside of the science lab is called the field.

True

False

Wear an apron to protect yourself and your clothes from chemicals.

True

False

Wear plastic gloves to protect your hands from hot beakers.

True

False

A fire blanket is used to smother flames.

True

False

An estimate is an approximation of a number based on reasonable assumptions.

True

False

Accuracy refers to how close a group of measurements are to each other.

True

False

The mean is the middle number in an ordered set of data.

True

False

The median appears most often in a list of numbers.

True

False

To find percent error, you subtract the true value from the experimental value and divide by the true value.

True

False

The anomalous data in a measurement include all digits measured exactly, and one estimated digit.

True

False

Bar graphs can be used to represent categorical data.

True

False

When a graph has no clear trend, it means the variables are related.

True

False

Scientists control changes in the independent variable.

True

False

Data points do not fall in a straight line on a(n) nonlinear graph.

True

False

When scientists use graphs to identify trends, they are making a forecast about what will happen in the future.

True

False

Because it is affected by gravity, an object’s mass would be less on the moon, where there is less gravity.

True

False

Your heart pumping faster when you exercise is an example of input.

True

False

The basic SI unit for the volume of a rectangular solid is the liter.

True

False

Scientists may make assumptions to simplify a model.

True

False

The output of a toaster is electricity.

True

False

All models are physical objects.

True

False

Density determines whether an object will float or sink in water.

True

False

The basic unit for measuring mass is the kilogram.

True

False

A student on the archery team gets all her arrows in the same spot on the target. They are all outside the bull’s eye. Which best describes her results?

both accurate and precise

precise but not accurate

accurate but not precise

neither precise nor accurate

A student added the measurements 36.67 g and 4.1 g. Which of the following expresses the sum with the correct number of significant figures?

40.7 g

40.77 g

40.8 g

41 g

Which of the following shows the mean with the correct number of significant figures for the numbers 15.6, 14.1, 7.7, 12.9, 12.9?

12

12.6

12.64

12.7

A student calculated the density of tin to be 7.20 g/mL. The actual density of tin is 7.29 g/mL. Which of the following is his percent error?

0.01 percent

0.09 percent

1.23 percent

1.25 percent

Scientists test their ideas about things they cannot observe directly by building.

models

theories

systems

evidence

Models can help scientists understand a system’s

assumptions 

investigations

processes

theories

Input, output, and process are parts of a(n)

system

assumption

model

hypothesis

Scientists may use a computer to keep track of the variables in a complex

model

program

feedback

system

What is the first safety step you should take before an investigation?

Clean and organize your work area.

Make sure you know its safety symbols.

Put on an apron and goggles.

Wash your hands

What are the first two steps you should follow in case of a fire?

activate the fire alarm, then leave the building.

activate the fire alarm, then put out the fire.

alert your teacher, then follow directions quickly.

Put out the fire, then call 911.

Which of the following safety procedures should you always follow in the field?

wear goggles

wear sandals

work with a partner 

keep a field notebook 

Any area outside of the science lab is called the field.

True

False

Wear an apron to protect yourself and your clothes from chemicals.

True

False

Wear plastic gloves to protect your hands from hot beakers.

True

False

A fire blanket is used to smother flames.

True

False

An estimate is an approximation of a number based on reasonable assumptions.

True

False

Accuracy refers to how close a group of measurements are to each other.

True

False

The mean is the middle number in an ordered set of data.

True

False

The median appears most often in a list of numbers.

True

False

To find percent error, you subtract the true value from the experimental value and divide by the true value.

True

False

The anomalous data in a measurement include all digits measured exactly, and one estimated digit.

True

False

Bar graphs can be used to represent categorical data.

True

False

When a graph has no clear trend, it means the variables are related.

True

False

Scientists control changes in the independent variable.

True

False

Data points do not fall in a straight line on a(n) nonlinear graph.

True

False

When scientists use graphs to identify trends, they are making a forecast about what will happen in the future.

True

False