8th GradePhysical Science

Review

“The Game”

1. Which of the following choices would be the LEAST valid scientific question about electricity?

A. How much electricity is lost in a circuit?B. Which metal wire conducts electricity

best?C. Is it immoral to depend on electrical

appliances?D.How much current is needed to light a

bulb?

2. When a battery is used to power a motor, the sequence of energy changes are:

A. Mechanical to electrical to chemical?B. Electrical to chemical to mechanical?C. Chemical to electrical to mechanical?D.Chemical to mechanical to electrical?

3. Jenny’s class was investigating how fast ice cubes melt at different locations in the room. Which would be the BEST way to select ice cubes to use?

A. Measure the mass of several cubes and choose the ones that have the greatest mass.

B. Take ice cubes from the same bag.C. Choose ice cubes that look about the

same sizeD. Measure the mass of several cubes and

choose the ones that are closest in mass.

4. What must be true for a car to move forward at a constant speed? The forward force of the car is

A. Increasing at a constant rateB. Greater than the force of gravityC. Balanced with the force of frictionD. Greater than the backward force on the

car

5. An example of refracted light isI. A magnifying glassII. A microscopeIII. A telescope

A. I onlyB. I and II onlyC. III onlyD. I, II, and III

6. What is the metric unit of volume?

A. MeterB. LiterC. GramD.cup

7. Heather finds this list of instructions in her journal. 1. Fill graduated cylinder with 30 mL of water2. Place unidentified metal in water3. Measure level of water at the bottom of the

miniscus

What procedure was she most likely performing??

A. Measuring the volume of the metalB. Cleaning the metalC. Dissolving the metalD.Measuring the density of the metal

8. Which of the following statement(s) are TRUE?

I. New technologies always make the world better.

II. There are risks associated with some new technologies.

III. Technologies can have unexpected consequences.

A. I onlyB. I and IIIC. II and IIID. I and II

9. An example of balanced forces is:

A. An object sitting on the groundB. Bouncing a ballC. Downhill skiingD. Shooting a rocket into space

10. Which of the following is an example of a physical change?

A. Wood burningB. Rust formingC. PhotosynthesisD. Water evaporating

11. Silver and sulfur can react chemically to form the black discoloration called tarnish that eventually coats silver objects exposed to the air. If 48 grams of silver react with 8 grams of sulfur, the mass of the products would be

A. 6 gramsB. 40 gramsC. 56 gramsD. 384 grams

12. Which of the following correctly describes what happens to liquid water if its molecules slow down enough?

A. A physical change takes place as energy is removed, and it changes state to ice.

B. A physical change takes place as energy is added, and it changes state to steam.

C. A chemical change takes place as energy is added, and its temperature goes up.

D. A chemical change takes place as energy is removed, and it thermally expands.

13. Elizabeth dropped a small drop of water on the book she was reading. She noticed that the letters under the drop of water seemed much bigger than the rest of the type. This happened because water:

A. Reflects lightB. Refracts lightC. Absorbs lightD. Is translucent

14. How is an electromagnet created?

A. Current runs through a wire coiled around a metal bar

B. A wire moves through a magnetic field to induce a current.

C. Both A and BD. Neither A nor B

15. An example of energy changing from chemical to electrical to mechanical is:

A. Lighting a bulb with a batteryB. Running a battery powered toy carC. lighteningD. Using your microwave oven plugged

into a household outlet.

16. As white light passes through a prism it bends into its different colors – red, orange, yellow, green, blue, and violet. Which term best describes what happens to the light as it passes through the prism?

A. AbsorptionB. RefractionC. ReflectionD. Scattering

17. Which surface is most likely to absorb sound waves that strike it?

A. A concrete floorB. A lakeC. A windowD. A pillow

18. Atoms of an element are extremely small particles that:

A. Are stuck togetherB. Have only air between themC. Have only space between themD. Are bonded to other types of

elements

19. Ammonia is made of molecules formed by bonding a nitrogen atom with three hydrogen atoms. What is ammonia?

A. An elementB. A compoundC. A mixtureD. None of the above

20. An example of balanced forces is:

A. An object moving forward at a constant speed

B. Bouncing a ballC. Downhill skiingD. Shooting a rocket into space

21. If two substances occupy the same amount of space, and have the same exact mass, then they must:

A. Have different volumesB. Have the same costC. Have the same densityD. Have different weights

22. What happens when water molecules in the air slow down after hitting a cold surface (such as a cold window pane or a drinking glass filled with an iced liquid)?

A. The water molecules recombine to form a liquid

B. The water molecules shrink and pass through the glass to the other side

C. nothingD. The water molecules disappear

23. Which of the following are important safety factors in working with electricity?

I. Unplug a lamp before changing the bulb.II. Use grounding devices for electrical appliances.III. Frayed prongs do not always need replacing.

A. I onlyB. I and II onlyC. II and III onlyD. I, II and III

24. On cool mornings, dew drops (drops of water) form on grass. The formation of dew drops is an example of what kind of state change?

A. meltingB. freezingC. sublimationD. condensation

25. Water is made of:

A. Water atomsB. Two hydrogen molecules bonded to

one oxygen moleculeC. Water moleculesD. One hydrogen atom bonded to two

oxygen molecules

26. Molecules of liquid:

A. Float in waterB. Float in more of the same liquid

bonded to one oxygen moleculeC. Have only space between themD. Have air between them

27. Sandy placed a bottle of water in the freezer to chill fast. However, she forgot about it and did not find it until the following morning. By that time the bottle had broken and made a big mess. This happened because:

A. The mass of the water had increasedB. The volume of the water had increasedC. The density of the water had increasedD. None of the above

28. Which of the following statements is TRUE about how atoms and molecules work?

A. Atoms and molecules move faster in ice than in water.

B. Atoms and molecules move slower in ice than in steam.

C. Atoms and molecules in water and steam move at the same speed.

D. Atoms and molecules in ice do not move.

29. The energy associated with motion is referred to as mechanical energy. Which of the following are examples of mechanical energy?

I. Fire from a charcoal grillII. A jet plane cruising at 450 miles per

hourIII. Water in a waterfall

A. I onlyB. I and II onlyC. II and III onlyD. III only

30. A glass rod can be positively charged by rubbing it with silk. A plastic rod can be negatively charged by rubbing it with fur. Which choice best describes the interaction between two positively charged glass rods and between a positively charged glass rod and a negatively charged plastic rod?

A. The glass rods attract each other; the glass and plastic also attract each other.

B. The glass rods push each other away; the glass and plastic also push each other away.

C. The glass rods attract each other; the glass and plastic push each other away.

D. The glass rods push each other away; the glass and plastic attract each other.

31. Which of the following statements are TRUE about electromagnetism?

I. Electric current can create a magnetic field.

II. Magnetic poles create electric chargesIII. A magnetic field can move electric

charges in a wire

A. I onlyB. I and III onlyC. II and III onlyD. I, II and III

32. Order water, air, and rock from slowest to fastest media for transmitting sound.

A. Air, water, rockB. Water, air, rockC. Rock, water, airD. They are all the same

33. Choose the correct answer to complete the following analogy:Echolocation: bats :: : boats

A. echoesB. sonarC. acousticsD. reflections

34. Which of the following statements is FALSE?

A. All of the light that strikes a textbook is absorbed.

B. Objects sometimes reflect the light that hits them.

C. Light waves can pass through a window.

D. Light waves and sound waves travel in different ways.

35. About 85 percent of the light that strikes an object passes through it without bending. Which term best describes the material?

A. opaqueB. refractedC. transparentD. reflected

36. A concrete floor reflects sound waves. Which choice best describes what is happening to the waves?

A. The floor absorbs all of the waves.B. The material in the floor bends the

waves.C. The waves bounce off the floor and

back into the room.D. The waves pass through the floor.

37. The density of gold is about 19.3 grams per cubic centimeter (g/cm3)? What is the mass of a 1 cubic centimeter piece?

A. 1 gramB. 19.3 gramsC. 38.6 gramsD. 372.49 grams

38. Which choice BEST demonstrates the state change when an object evaporates?

A. Solid liquidB. Solid gasC. Liquid gasD. Gas liquid

39. Choose the word that BEST completes this analogy:sound: sonar :: light: .

A. EchoB. AcousticsC. RefractionD. telescope

40. A student describes an attractive force that increases in strength with an increase in mass or a decrease in distance. Which force is he describing:

A. MagnetismB. Electric forceC. GravityD. All of the above

41. Choose the term that BEST completes this analogy:building : height :: wave : .

A. AmplitudeB. FrequencyC. PeriodD. Vibration

42. Which two tools would BEST be used to measure the density of a sample of alcohol?

A. Thermometer and balanceB. Pan balance and rulerC. Graduated cylinder and balanceD. Ruler and measuring cup

43. Which of the following statements is FALSE?

A. Atoms and molecules move faster as the temperature rises.

B. Atoms and molecules stop moving when an object freezes.

C. Atoms and molecules are in constant motion.

D. Atoms and molecules in a gas are less restricted than in a solid.

44. Sandy’s mother yelled at her to turn down her stereo because

A. Sound is transmitted through solids

B. Sound is reflected off solidsC. Sound only travels through airD. Both A & B

45. What property stays the same no matter the volume or mass of the object?

•A. weight•B. size•C. density•D. shape

•46. A pepperoni pizza is a good example of a(n):

•A. element•B. compound•C. mixture•D. solution

48. Water is a good example of:a.Elementb.Compoundc.Mixtured.solution

49. Carbon is a good example of a:

a.Elementb.Compoundc.Mixtured.solution

50. Sunlight + Co2 C6H12o6 + H2o + o2

In the above formula, which of the following is a reactant?

A.H20B.C02C.C6H12o6D.o2