Quiz about 8th Science STAAR Review

Question 1

Which of the following is classified as an element?

Accepted Answer

Na

Answer

NaCl

Answer

CO

Answer

H2O

Question 2

A student rides a bicycle down a hill. At which point do the student and the bicycle have the most potential energy?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 3

Which of the following keeps Earth in its orbit?

Accepted Answer

the gravity of the sun

Answer

the rotation of Earth

Answer

the revolution of the moon

Answer

the gravity of the moon

Question 4

What unit do scientists use to measure size and distance in space?

Accepted Answer

Light Years

Answer

Kilometers

Answer

Miles

Answer

Moon units

Question 5

Mushrooms and yeasts are classified together in the fungi kingdom. Specific characteristics are used to classify these organisms. Which of the following is a characteristic used to classify these organisms as fungi?

Accepted Answer

They are heterotrophs.

Answer

They are parasites.

Answer

They are unicellular.

Answer

They are prokaryotes.

Question 6

Blue whales live in oceans. What type of factors do they rely on for their existence?

Accepted Answer

Both biotic and abiotic factors

Answer

Only biotic factors

Answer

Only abiotic factors

Answer

Neither biotic nor abiotic factors

Question 7

A metal body of mass 189 g occupies a volume of 70 cm3. Identify the metal. Use the chart below and identify what metal you have.

Accepted Answer

Aluminum

Answer

Tungsten

Answer

Lead

Answer

Iron

Question 8

Which of the following compounds is considered an organic compound?

Accepted Answer

C₆H₁₂O₆

Answer

H2O

Answer

NaCl

Answer

CaCl₂

Question 9

Calculate the net force. Include magnitude AND direction.

Accepted Answer

362.5 left

Answer

362.5 right

Answer

4.5 left

Answer

4.5 right

Question 10

What type of weather would you expect if a warm front is moving through your area?

Accepted Answer

Several days of light rain followed by warm, humid weather

Answer

Several days of strong thunderstorms followed by hot, dry weather

Answer

Fast-moving, strong thunderstorms followed by warm, humid weather

Answer

No precipitation but a sudden change from cool weather to warm weather

Question 11

Which of the following would cause a hurricane to weaken?

Accepted Answer

Moving overland

Answer

Moving over warm ocean water

Answer

Quickly moving through the Gulf of Mexico

Answer

Heavy precipitation

Question 12

Which type of interaction exists between shrimp and blue crabs in this food web?

Accepted Answer

Shrimp compete with blue crabs for food.

Answer

Shrimp prey on blue crabs.

Answer

Shrimp help blue crabs filter polluted water.

Answer

Shrimp decompose matter for blue crabs.

Question 13

In this food web, which organism has the greatest number of food sources?

Accepted Answer

Hawk

Answer

Snake

Answer

Shrew

Answer

Mouse

Question 14

Which of the following is a chemical change that takes place in the digestive system?

Accepted Answer

Starches are broken down into sugars.

Answer

Undigested material is expelled from the body.

Answer

Water is separated from solids.

Answer

Sugar is dissolved and absorbed into the bloodstream.

Question 15

Which characteristic of motion could change without changing the velocity of an object?

Accepted Answer

The position

Answer

The speed

Answer

The direction

Answer

The acceleration

Question 16

During which of these phases of the moon would the Earth be experiencing the highest tides?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 17

Cesium (Cs), is a highly reactive metal. Which elements have a reactivity similar to cesium?

Accepted Answer

sodium (Na) and potassium (K)

Answer

barium (Ba) and radon (Rn)

Answer

silver (Ag) and cadmium (Cd)

Answer

strontium (Sr) and radium (Ra)

Question 18

Which element possesses some characteristics of metals and some of the non-metals and can conduct electricity?

Accepted Answer

B

Answer

A

Answer

C

Answer

D

Question 19

The three vehicles shown are all traveling at a speed of 15 m/s, but only the pickup truck has a changing velocity. The pickup truck has a changing velocity because the pickup truck --

Accepted Answer

is traveling on a curve in the road

Answer

can accelerate faster than the other two vehicles

Answer

is traveling in the opposite direction from the other two vehicles

Answer

needs a large amount of force to move

Question 20

Two cars with different masses travel at the same speed down a hill toward a stop sign. What will happen when both cars apply brakes at the same time to stop?

Accepted Answer

The car with the smaller mass will require less force to stop than the car with the larger mass.

Answer

The car with the larger mass will maintain its velocity while traveling down the hill.

Answer

The car with the smaller mass will take longer to stop than the car with the larger mass.

Answer

The car with the larger mass will have less inertia than the car with the smaller mass.

Question 21

What phase will the moon be in when it is in position E?

Accepted Answer

New Moon

Answer

1st Quarter

Answer

Full Moon

Answer

3rd Quarter

Question 22

Which type of electromagnetic wave has a wavelength longer than that of yellow light?

Accepted Answer

Infrared Radiation

Answer

UV Rays

Answer

X-rays

Answer

Gamma Rays

Question 23

The diagram below shows the beaks of five species of birds that developed over time from one parent species. Which of the following best explains why the beak shape of each species of bird developed differently?

Accepted Answer

Each beak shape is an adaptation to a specific source of food.

Answer

Each beak shape helps the birds to produce different songs.

Answer

Each beak shape is designed to construct a different type of nest.

Answer

Each beak shape helps protect the birds from a different predator.

Question 24

The main function of which system is to help protect inner organs from being damaged by an outside force?

Accepted Answer

Skeletal

Answer

Excretory

Answer

Nervous

Answer

Circulatory

Question 25

Carbon Dioxide (CO2) and Water (H2O) are used by plants to make food. Which of the following is the correct model for Carbon Dioxide?

Accepted Answer

Option B is correct

Answer

A.

Answer

C.

Answer

D.

Question 26

A toy train engine rests motionless on a track. One student begins pushing the engine to the right with a force of 2 newtons. At the same time, another student begins pushing the engine to the left with a force of 5 newtons. Which of the following best describes the resulting motion of the engine?

Accepted Answer

It travels left at an increasing speed.

Answer

It travels left at a constant speed.

Answer

It travels right at a constant speed.

Answer

It travels right at an increasing speed.

Question 27

At which position does the ball have the greatest kinetic and least potential energy?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 28

What phase will the moon be in when it is in position B?

Accepted Answer

Waning Gibbous

Answer

Waning Crescent

Answer

Waxing Gibbous

Answer

Waxing Crescent

Question 29

Which of the following best summarizes a fundamental concept of the cell theory?

Accepted Answer

Living organisms are composed of one or more cells.

Answer

Cells break down complex molecules to produce energy.

Answer

Cells are able to regulate their internal environment.

Answer

Living organisms rely on specialized cells to maintain health.

Question 30

The diagrams represent the way that three different organisms reproduce. Which of these classifies the reproductive method of all the organisms shown above?

Accepted Answer

asexual reproduction

Answer

Segmentation

Answer

Budding

Answer

sexual reproduction

Question 31

A researcher wants to experiment with an element that reacts like phosphorus (P) but has a greater atomic mass. Which element should the researcher select for the experiment?

Accepted Answer

Arsenic (As)

Answer

Nitrogen (N)

Answer

Sulfur (S)

Answer

Silicon (Si)

Question 32

A student walks 2 km in 30 minutes. What is the students' speed in km/hr?

Accepted Answer

4 km/hr

Answer

8 km/hr

Answer

12 km/hr

Answer

32 km/hr

Question 33

Which picture best illustrates the location of the sun in the Milky Way Galaxy?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 34

The early development of the theory of plate tectonics was supported by which of these observations?

Accepted Answer

matching fossils on the continents of Africa and South America

Answer

glacier deposits far from existing continental glaciers

Answer

thick sediment layers at the mouths of rivers

Answer

the sudden volcanic activity of long-dormant volcanoes

8th Science STAAR Review

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