Eighth Grade Comprehensive Science Pre-Test



Eighth Grade Comprehensive Science Midterm Study Guide

Directions: This is a multiple choice test so please read the question and all of the possible answers. When you have chosen the answer to the question, please write the letter of the answer you choose on your paper. If a scantron is provided, please bubble the letter of the answer you choose on your paper. Remember, that no calculators will be allowed to be used while you are taking this assessment.

1. A student finishes an experiment and is left with three empty beakers that held liquids during the experiment. The best lab practice is to

a. Leave the beakers exactly as they are for the next student.

b. Turn the beakers upside down to drain in the sink.

c. Wash the beakers and air dry them on a rack.

d. Take the beakers directly to the rack to dry.

2. A grassland community is comprised mostly of grass. In this particular community, the grass would play the role of

a. Secondary consumer

b. Primary consumer

c. Decomposer

d. Producer

3. Which of the following best represents stored potential energy?

a. Air leaking from a flat tire

b. Stress built up in a rock fault

c. Heat given off by a forest fire

d. Water flowing through a hose

4. Which of the following is an example of a chemical change?

a. A pot of boiling water

b. An iron nail rusting

c. Corn being ground

d. Sugar dissolving in tea

5. Read each description of subatomic particles that are a part of the modern model of the atom. Choose which one correctly describes the neutron subatomic particle.

a. This is the centrally located part of the atom that is mostly positively charged.

b. This is the subatomic particle located in the nucleus with no charge.

c. This is the subatomic particle whose mass is practically equal to that of the proton.

d. This the subatomic particle located in the cloud and is negatively charge.

6. The transfer of Carbon that results in the burning of fossil fuels will most likely affect Earth in the future by

a. Raising the average global temperature

b. Reducing evaporation rates of oceans

c. Decreasing the total mass of plant life

7. An experiment is being done to determine how light affects the growth of 3 different types of pea plants. Peas of each type are planted in several cups, and the cups are labeled X, Y, and Z to show the type of pea plant in each. Some cups are set in each of the 3 locations to receive different amounts of light. Which of the following best shows how the plants should be arranged for the experiment?

a. X X X in location 1, Y Y Y in location 2, and Z Z Z in location 3

b. X Y Z in location 1, X Y Z in location 3, and X Y Z in location 3

c. X Y in location 1, X Z in location 2, and Y Z in location 3

d. X in location 1, Y in location 2, and Z in location 3

8. Which of the following set of equipment is used to measure the boiling point of water?

a. Balance, thermometer, and stopwatch

b. Test tube, hot plate, and balance

c. Stopwatch, test tube, and microscope

d. Beaker, hot plate, and thermometer

9. According to the periodic table, which description best represents the element carbon?

a. I valance electron and 1 proton

b. 4 valance electrons with 6 protons and neutrons in the nucleus

c. 6 valance electrons with 8 protons and neutrons in the nucleus

d. 1 valance electron with 11 protons and 12 neutrons

10. If the meniscus lies in the middle of 50 mL and 40 mL in the graduated cylinder, then what is the volume of the liquid in mL?

a. 50 mL

b. 47 mL

c. 45 mL

d. 42 mL

11. Evidence suggests that dinosaurs became extinct when a large meteorite struck in the area of the Yucatan Peninsula. Scientists predict that this enormous impact killed all the dinosaurs, even those on the other side of the Earth because the

a. Debris thrown into the atmosphere blocked the sunlight

b. Heat flash from the impact immediately vaporized all land forms

c. Impact blasted from the atmosphere surrounding the Earth into space

d. Intense heat completely boiled away the oceans

12. If a wave has the property of traveling in a direct path without radiating in all directions like a light wave, then this wave is most likely a ______ wave.

a. Ocean

b. Band width

c. Sound

d. Seismic

.

13. Read the following table that shows the number of protons in 4 different elements. According to the periodic table, which of them is most likely a metal?

|Element |Number of Protons |

|T |7 |

|Q |15 |

|X |12 |

|Z |17 |

a. T

b. Q

c. X

d. Z

14. Which of the following is least affected by seasonal environmental conditions?

a. The patterns in a tiger’s fur

b. The dropping of tree leaves

c. The sprouting of acorns

d. The migration of gray whales

15. Read the following chemical reaction and choose from the answers below which best represents the food energy made by plants?

C02 + H20 + Sunlight Energy ( C6H1206 + O2

Carbon dioxide Water Glucose Oxygen

16. If a car accelerates from rest to a distance of 60 kilometers and a time period of 4 hours, then what is the average speed of the car?

a. 10 km/hr

b. 15 km/hr

c. 30 km/hr

d. 60 km/hr

17. Let’s suppose there are 4 different kinds of the same grass growing. If the length of their roots vary from very short to long, which of the following root lengths do you believe would give the grass plant a better chance of surviving in times of very dry weather?

a. Short, not far from the surface

b. Medium in root length

c. The longest of the root systems

d. Root length does not affect its survival in dry climates.

18. What type of chemical reaction is this: Cu2S + 02 ( 2 Cu + SO2

a. Synthesis chemical reaction

b. Decomposition chemical reaction

c. Single-replacement reaction

d. Double-replacement reaction

19. If a rollercoaster demonstrates the exchange between potential and kinetic energy, then at what point will the rollercoaster have the greatest amount of kinetic energy?

a. At the beginning before it starts to move

b. At the lowest point of the rollercoaster track

c. At the highest point of the rollercoaster track

20. Which energy transfer is demonstrated by the lighting of a match?

a. Chemical energy to heat energy

b. Heat energy to potential energy

c. Electrical energy to heat energy

d. Kinetic energy to potential energy

21. On a data analysis graph, how are the x and y axis related to the variables from the experiment?

a. The manipulated variable is represented by the x-axis

b. The responding variable is represented by the y-axis

c. Both a and b are correct

d. Neither a nor b are correct

Read the following data table from an Energy experiment an 8th grade science class performed.

|Resting |Very Light |Light |Moderate |Heavy |Total |Male or Female |

|“Sleep” |“Sitting Activities” |“Walking Activities” |“Medium-level |“High-level running |Calories | |

|(calories) |(calories) |(calories) |Activities” |activities” | | |

| | | |(calories) |(calories) | | |

| | | | | | | |

22. What is a possible scientific question for this experiment?

a. Do different activities affect the amount of calories burned?

b. Are the total calories more or less than all of the activity values?

c. Does the gender of a person affect how much calories they do they high level activities?

d. What is the relationship between gender and calories burned?

23. In order to calculate the total calories, what would you need to do?

a. Resting value + Very Light value + Light + Moderate + Heavy

b. Calculate the average by adding the values and then dividing by 5

c. Add the number of males to the number of females and then divide by the total calories

d. Multiply the values and then subtract the number of male participants

24. The amount of calories burned would represent the _____ variable.

a. Manipulated

b. Responding

25. The intensity of the activity would represent the ____ variable.

a. Manipulated

b. Responding

26. The formula for the Basal Metabolic Rate or the BMR is useful for understanding the results of this experiment because it gives you the amount of calories that would be burned by the person if they stayed in bed all day. Comparing this value to those in the experiment would be the correct method because it provides a more specific conclusion. The formula for the male is = (7.95 x weight in pounds) + 651. Calculate the BMR for a male who has a mass of 100 pounds.

a. 1,446 calories

b. 3,500 calories

c. 1,200 calories

d. 500 calories

27. Using the same information from question 31, let’s see what it would be like to calculate the BMR of a female participant. The formula to use is (5.55 x weight in pounds) + 746. Calculate the BMR of the female participant is she has a mass of 100 pounds.

a. 1,301 calories

b. 275calories

c. 1,104 calories

d. 467 calories

28. Which of the two genders has a higher BMR?

a. Females

b. Males

29. Now that you know which of the two genders has the higher BMR, which of the two do you predict for the future will generally have an easier time losing weight?

a. Females

b. Males

30. In plant and animal cells, the control center of the cell is the

a. Chloroplast

b. Cytoplasm

c. Nucleus

d. Golgi Body

31. The different forms of a gene are called

a. Alleles b. Chromosomes c. phenotypes d. genotypes

32. An organism with two identical alleles for a trait is

a. Heterozygous

b. Homozygous

c. Recessive

d. Dominant

33. If the body cells of an organism have 10 chromosomes, then the sex cells produced during meiosis would have

a. 5 chromosomes

b. 10 chromosomes

c. 15 chromosomes

d. 20 chromosomes

34. During protein synthesis, messenger RNA

a. Links one amino acid to another

b. Releases the completed protein chain

c. Provides a code from DNA in the nuceleus

d. Carries amino acids to the ribosome

35. Which of the following is the first step in the formation of sex cells in an organism that has eight chromosomes?

a. The two chromatids of each chromosome separate

b. Chromosome pairs line up next to each other in the center of the cell

c. The DNA in the eight chromosomes is copied.

d. The chromatids move apart, producing cells with 4 chromosomes each

36. A section of DNA has the base sequence GCTTAA. What is the corresponding RNA base sequence?

a. GCTTAA

b. CGAAUU

c. CGAATT

d. UUTTCG

37. Precipitation, condensation, and evaporation are associated with the ______ cycle.

a. Carbon Cycle

b. Nitrogen Cycle

c. Water Cycle

38. Producers taking in carbon dioxide from the atmosphere during photosynthesis and restoring the oxygen gas is associated with the ____ cycle.

a. Krebb Cycle

b. Water Cycle

c. Carbon Cycle

39. After the nitrogen cycle “fixes” the nitrogen, what happens next?

a. Used by organisms to build proteins

b. The element can no longer gain any additional electrons

c. The animal dies from the nitrogen fixation

40. On a topographic map, what connects points of equal elevations?

a. Dashed lines

b. Contour lines

c. Contour intervals

d. Longitude lines

41. What is the imaginary line that circles the Earth halfway between the poles?

a. prime meridian

b. contour interval

c. equator

d. hemisphere

42. Why is soil one of Earth’s most valuable resources?

a. It partly consists of valuable rock particles

b. Soil cannot be damaged or lost

c. Everything that lives on land depends on soil

d. Most soil consists of sand

43. Which of the following is a nonrenewable energy source for making electricity?

a. petroleum

b. biomass fuels

c. solar rays

d. geothermal energy

44. Which process breaks down rocks and other materials at Earth’s surface?

a. weathering

b. condensation

c. decomposition

d. deposition

45. The movement of rock particles by wind, water, ice and gravity is called

a. erosion

b. precipitation

c. abrasion

d. deposition

46. The height of an ocean wave is related to

a. how far it has traveled

b. how much sediment it is carrying

c. how much energy it has

d. its frequency

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