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14,900 | NDQ_018149 | pulley | all pulleys increase the force applied to the pulley. | null | null | Multiple Choice | a. true, b. false | b |
14,901 | NDQ_018150 | radio waves | electromagnetic waves vary in their wavelengths and frequencies. | null | null | Multiple Choice | a. true, b. false | a |
14,902 | NDQ_018153 | radio waves | radio waves have the highest frequencies of all electromagnetic waves. | null | null | Multiple Choice | a. true, b. false | b |
14,903 | NDQ_018154 | radio waves | radio waves have the least energy of all electromagnetic waves. | null | null | Multiple Choice | a. true, b. false | a |
14,904 | NDQ_018155 | radio waves | radio waves vary in frequency from | null | null | Multiple Choice | a. 105 to 1012 Hz., b. 1050 to 10,120 Hz., c. 10,500 to 101,200 Hz., d. none of the above | a |
14,905 | NDQ_018156 | radio waves | am radio waves | null | null | Multiple Choice | a. have longer wavelengths than FM radio waves., b. are encoded with signals by changing their amplitude., c. reflect off the ionosphere., d. all of the above. | d |
14,906 | NDQ_018158 | radio waves | in tv broadcasts | null | null | Multiple Choice | a. radio waves carry both sound and picture signals., b. sounds are encoded withy amplitude modulation., c. pictures are encoded with frequency modulation., d. all of the above | a |
14,907 | NDQ_018163 | radioactive decay | radioactive decay is a chemical reaction. | null | null | Multiple Choice | a. true, b. false | b |
14,908 | NDQ_018164 | radioactive decay | radioactive decay may change one element into another. | null | null | Multiple Choice | a. true, b. false | a |
14,909 | NDQ_018165 | radioactive decay | energy is emitted by a nucleus when it undergoes | null | null | Multiple Choice | a. alpha decay., b. beta decay., c. gamma decay., d. any of the above | d |
14,910 | NDQ_018166 | radioactive decay | the type of radioactive decay that occurs when a nucleus emits an electron is | null | null | Multiple Choice | a. alpha decay., b. beta decay., c. gamma decay., d. none of the above | b |
14,911 | NDQ_018167 | radioactive decay | the type of radioactive decay that occurs when a nucleus emits two protons and two neutrons is | null | null | Multiple Choice | a. alpha decay., b. beta decay., c. gamma decay., d. none of the above | a |
14,912 | NDQ_018170 | radioactivity | certain chemical processes can change one element into another. | null | null | Multiple Choice | a. true, b. false | b |
14,913 | NDQ_018171 | radioactivity | atoms of each element have a unique number of | null | null | Multiple Choice | a. protons., b. neutrons., c. isotopes., d. two of the above | a |
14,914 | NDQ_018174 | radioactivity | all nuclei emit radiation. | null | null | Multiple Choice | a. true, b. false | b |
14,915 | NDQ_018175 | radioactivity | nuclei may be unstable if they have | null | null | Multiple Choice | a. too much energy., b. too many protons., c. an unstable ratio of protons to neutrons., d. any of the above | d |
14,916 | NDQ_018176 | radioactivity | all elements with more than 75 protons are unstable. | null | null | Multiple Choice | a. true, b. false | b |
14,917 | NDQ_018177 | radioactivity | which of the following elements are radioactive? | null | null | Multiple Choice | a. uranium, b. radium, c. polonium, d. all of the above | d |
14,918 | NDQ_018181 | radioisotopes | only radioactive elements have isotopes that are radioactive. | null | null | Multiple Choice | a. true, b. false | b |
14,919 | NDQ_018183 | radioisotopes | radioactive isotopes are unstable because they have too many electrons. | null | null | Multiple Choice | a. true, b. false | b |
14,920 | NDQ_018184 | radioisotopes | the nucleus that is most likely to be unstable is the nucleus that has | null | null | Multiple Choice | a. 2 protons and 2 neutrons., b. 4 protons and 4 neutrons., c. 6 protons and 8 neutrons., d. 60 protons and 90 neutrons. | c |
14,921 | NDQ_018185 | radioisotopes | the radioisotope of carbon is called | null | null | Multiple Choice | a. carbon-6., b. carbon-8., c. carbon-13., d. carbon-14. | d |
14,922 | NDQ_018200 | reactants and products | chemical changes occur because of chemical reactions. | null | null | Multiple Choice | a. true, b. false | a |
14,923 | NDQ_018201 | reactants and products | an example of a chemical change is a candle burning. | null | null | Multiple Choice | a. true, b. false | a |
14,924 | NDQ_018202 | reactants and products | any substance that starts a chemical reaction is called a | null | null | Multiple Choice | a. reactor., b. regent., c. reactant., d. none of the above | c |
14,925 | NDQ_018203 | reactants and products | any substance that results from a chemical reaction is called a | null | null | Multiple Choice | a. producer., b. product., c. productor., d. none of the above | b |
14,926 | NDQ_018205 | reactants and products | products of a combustion reaction include | null | null | Multiple Choice | a. fuel., b. oxygen., c. water., d. two of the above | c |
14,927 | NDQ_018210 | recognizing chemical reactions | all changes in matter are the result of chemical reactions. | null | null | Multiple Choice | a. true, b. false | b |
14,928 | NDQ_018211 | recognizing chemical reactions | signs that a chemical reaction has occurred include a change in | null | null | Multiple Choice | a. temperature., b. color., c. state., d. two of the above | d |
14,929 | NDQ_018215 | recognizing chemical reactions | which of the following is a sign of a chemical reaction? | null | null | Multiple Choice | a. A liquid changes to a solid., b. A liquid changes to a gas., c. A solid changes to a gas., d. A gas is released from a liquid. | d |
14,930 | NDQ_018216 | recognizing chemical reactions | the solid lumps in cottage cheese are an example of a precipitate. | null | null | Multiple Choice | a. true, b. false | a |
14,931 | NDQ_018217 | recognizing chemical reactions | the release of gas bubbles is a sign of a chemical reaction. | null | null | Multiple Choice | a. true, b. false | a |
14,932 | NDQ_018218 | recognizing chemical reactions | which of the following does not involve chemical reactions? | null | null | Multiple Choice | a. Leaves change color in the fall., b. A pond freezes over in the winter., c. A fire burns a pile of fallen leaves., d. Fallen leaves decay in a compost pile. | b |
14,933 | NDQ_018231 | replacement reactions | less reactive elements replace more reactive elements in compounds. | null | null | Multiple Choice | a. true, b. false | b |
14,934 | NDQ_018232 | replacement reactions | replacement reactions always involve ionic compounds. | null | null | Multiple Choice | a. true, b. false | a |
14,935 | NDQ_018233 | replacement reactions | a single replacement reaction always involves two reactant compounds. | null | null | Multiple Choice | a. true, b. false | b |
14,936 | NDQ_018234 | replacement reactions | which of the following is a single replacement reaction? | null | null | Multiple Choice | a. FeS + 2HCl → H2S + FeCl2, b. Fe + CuSO4 → FeSO4 + Cu, c. AgNO3 + NaCl ---> AgCl + NaNO3, d. none of the above | b |
14,937 | NDQ_018235 | replacement reactions | the general equation for a double replacement reaction is | null | null | Multiple Choice | a. AB + CD → BC + DA., b. AB + C + D → AD + CB, c. AB + C → AC + B, d. none of the above | d |
14,938 | NDQ_018238 | replacement reactions | a compound in a replacement reaction always consists of | null | null | Multiple Choice | a. a positive ion and a negative ion., b. a metal ion and a nonmetal ion., c. two negative metal ions., d. two of the above | d |
14,939 | NDQ_018254 | rutherfords atomic model | in rutherfords experiments, most of the alpha particles | null | null | Multiple Choice | a. were deflected by the gold foil., b. passed straight through the gold foil., c. bounced straight back from the gold foil., d. none of the above | b |
14,940 | NDQ_018255 | rutherfords atomic model | from his results, rutherford concluded that the positive charge of an atom is | null | null | Multiple Choice | a. less than the negative charge of the atom., b. spread evenly throughout the atom., c. concentrated in a tiny area at the center of the atom., d. two of the above | c |
14,941 | NDQ_018256 | rutherfords atomic model | based on his research, rutherford thought that most of an atom consists of empty space. | null | null | Multiple Choice | a. true, b. false | a |
14,942 | NDQ_018257 | rutherfords atomic model | rutherford predicted the existence of neutrons but failed to find them. | null | null | Multiple Choice | a. true, b. false | a |
14,943 | NDQ_018272 | saturated hydrocarbons | the melting points of saturated hydrocarbons are determined mainly by their number of | null | null | Multiple Choice | a. double bonds., b. hydrogen atoms., c. carbon atoms., d. none of the above | c |
14,944 | NDQ_018273 | saturated hydrocarbons | which saturated hydrocarbon has the chemical formula c2h6? | null | null | Multiple Choice | a. methane, b. ethane, c. propane, d. butane | b |
14,945 | NDQ_018274 | saturated hydrocarbons | which saturated hydrocarbon has eight carbon atoms? | null | null | Multiple Choice | a. pentane, b. hexane, c. heptane, d. octane | d |
14,946 | NDQ_018275 | saturated hydrocarbons | methane has a higher boiling point than ethane. | null | null | Multiple Choice | a. true, b. false | b |
14,947 | NDQ_018276 | saturated hydrocarbons | some alkanes are solids are room temperature. | null | null | Multiple Choice | a. true, b. false | a |
14,948 | NDQ_018300 | scientific graphing | types of graphs include | null | null | Multiple Choice | a. bar graphs., b. line graphs., c. circle graphs., d. all of the above | d |
14,949 | NDQ_018301 | scientific graphing | different types of graph are best suited for representing different types of data. | null | null | Multiple Choice | a. true, b. false | a |
14,950 | NDQ_018342 | scientific modeling | to be useful, a scientific model must | null | null | Multiple Choice | a. closely represent the real thing in important ways., b. be simpler than the real thing., c. be easier to understand than the real thing., d. all of the above | d |
14,951 | NDQ_018346 | scientific modeling | a chemical equation is an example of a model. | null | null | Multiple Choice | a. true, b. false | a |
14,952 | NDQ_018348 | scientific modeling | a road map is a three-dimensional model. | null | null | Multiple Choice | a. true, b. false | b |
14,953 | NDQ_018370 | scope of chemistry | basic concepts in chemistry include | null | null | Multiple Choice | a. atoms and molecules., b. chemical reactions., c. energy., d. all of the above | d |
14,954 | NDQ_018372 | scope of chemistry | which of the following changes involve(s) chemical reactions? | null | null | Multiple Choice | a. candle burning, b. fruit spoiling, c. meat cooking, d. all of the above | d |
14,955 | NDQ_018391 | scope of physics | important physics concepts include | null | null | Multiple Choice | a. motion., b. forces., c. energy., d. all of the above | d |
14,956 | NDQ_018392 | scope of physics | which of the following is an example of a force? | null | null | Multiple Choice | a. magnetism, b. motion, c. light, d. none of the above | a |
14,957 | NDQ_018393 | scope of physics | which of the following is a form of energy? | null | null | Multiple Choice | a. gravity, b. sound, c. matter, d. two of the above | b |
14,958 | NDQ_018400 | screw | examples of screws include | null | null | Multiple Choice | a. wood screws., b. spiral staircases., c. bottle caps., d. all of the above | d |
14,959 | NDQ_018401 | screw | uses of screws include | null | null | Multiple Choice | a. raising objects., b. lowering objects., c. holding objects together., d. all of the above | d |
14,960 | NDQ_018402 | screw | screws help us do work by increasing the | null | null | Multiple Choice | a. amount of force that is applied., b. distance over which force is applied., c. speed with which force is applied., d. two of the above | a |
14,961 | NDQ_018403 | screw | the input force is applied to the inclined plane of a screw. | null | null | Multiple Choice | a. true, b. false | a |
14,962 | NDQ_018405 | screw | the mechanical advantage of a screw is always less than 1. | null | null | Multiple Choice | a. true, b. false | b |
14,963 | NDQ_018407 | screw | in the picture above, it takes it takes more turns of the screw on the right to go the same distance into the wood as the screw on the left. | null | null | Multiple Choice | a. true, b. false | a |
14,964 | NDQ_018420 | significant figures | significant figures for a measurement always include | null | null | Multiple Choice | a. all the digits that can be read directly from the measuring device., b. one digit estimated by the person taking the measurement., c. at least two digits to the right of the decimal point., d. two of the above | d |
14,965 | NDQ_018421 | significant figures | assume that you take a measurement with a metric ruler that is divided into individual millimeters. which measurement has the correct number of significant figures? | null | null | Multiple Choice | a. 21 mm, b. 21.0 mm, c. 21.00 mm, d. none of the above | b |
14,966 | NDQ_018422 | significant figures | which of the following is a correct rule for counting significant figures? | null | null | Multiple Choice | a. Leading zeroes are always significant., b. Zeroes between nonzero digits are not significant., c. Zeroes that show only where the decimal point falls are not significant., d. Trailing zeroes are never significant. | c |
14,967 | NDQ_018424 | significant figures | when measurements are used in a calculation, the answer has the same number of significant figures as the measurement with the most signficant figures. | null | null | Multiple Choice | a. true, b. false | b |
14,968 | NDQ_018430 | simple machines | work is calculated with the equation work = force/distance. | null | null | Multiple Choice | a. true, b. false | b |
14,969 | NDQ_018432 | simple machines | the output distance of a machine is always | null | null | Multiple Choice | a. less than the input distance., b. greater than the input distance., c. equal to the input distance., d. none of the above | d |
14,970 | NDQ_018433 | simple machines | a machine increases the amount of work that is done. | null | null | Multiple Choice | a. true, b. false | b |
14,971 | NDQ_018435 | simple machines | if a machine increases force, it must apply the force over a longer distance. | null | null | Multiple Choice | a. true, b. false | b |
14,972 | NDQ_018436 | simple machines | machines that increase the distance over which force is applied include | null | null | Multiple Choice | a. steering wheels., b. pliers., c. rakes., d. two of the above | c |
14,973 | NDQ_018500 | sound waves | all sound waves begin with vibrating matter. | null | null | Multiple Choice | a. true, b. false | a |
14,974 | NDQ_018501 | sound waves | vibrations spread through the air in all directions from a vibrating object. | null | null | Multiple Choice | a. true, b. false | a |
14,975 | NDQ_018502 | sound waves | sound waves are | null | null | Multiple Choice | a. surface waves., b. transverse waves., c. longitudinal waves., d. none of the above | c |
14,976 | NDQ_018506 | sound waves | sound waves can travel only through gases. | null | null | Multiple Choice | a. true, b. false | b |
14,977 | NDQ_018507 | sound waves | materials that tend to absorb rather than transmit sound waves include | null | null | Multiple Choice | a. foam rubber., b. glass., c. metal., d. all of the above | a |
14,978 | NDQ_018508 | sound waves | sound waves are mechanical waves. | null | null | Multiple Choice | a. true, b. false | a |
14,979 | NDQ_018509 | sources of visible light | visible light includes all the wavelengths of light that the human eye can detect. | null | null | Multiple Choice | a. true, b. false | a |
14,980 | NDQ_018511 | sources of visible light | some animals can see infrared or ultraviolet light. | null | null | Multiple Choice | a. true, b. false | a |
14,981 | NDQ_018514 | sources of visible light | objects that produce light by incandescence include | null | null | Multiple Choice | a. candles., b. bonfires., c. oil lamps., d. all of the above | d |
14,982 | NDQ_018517 | sources of visible light | substances that produce light by electroluminescence include | null | null | Multiple Choice | a. diamond., b. emerald., c. neon., d. all of the above | c |
14,983 | NDQ_018530 | speed | speed determines how far something moves in a given amount of time. | null | null | Multiple Choice | a. true, b. false | a |
14,984 | NDQ_018531 | speed | the si unit for speed is | null | null | Multiple Choice | a. cm/s., b. m/s., c. m/h., d. km/h. | b |
14,985 | NDQ_018533 | speed | if you ride your bike 20 miles and it takes you 120 minutes, what is your average speed? | null | null | Multiple Choice | a. 6 m/h, b. 10 m/h, c. 20 m/h, d. 60 m/h | b |
14,986 | NDQ_018535 | speed | if you know your average speed and how long you have been traveling, then you can calculate your distance with the formula | null | null | Multiple Choice | a. distance = speed/time., b. distance = speed x time., c. distance = time/speed., d. none of the above | b |
14,987 | NDQ_018536 | speed | to calculate the amount of time it takes to travel a given distance at a certain speed, you would use the formula | null | null | Multiple Choice | a. time = distance/speed., b. time = distance x speed., c. time = speed/distance., d. none of the above | a |
14,988 | NDQ_018540 | speed of sound | the speed of sound is faster than the speed of light. | null | null | Multiple Choice | a. true, b. false | b |
14,989 | NDQ_018542 | speed of sound | sound waves can travel only through matter. | null | null | Multiple Choice | a. true, b. false | a |
14,990 | NDQ_018543 | speed of sound | sound waves generally travel most quickly through | null | null | Multiple Choice | a. gases., b. liquids., c. solids., d. plasma. | c |
14,991 | NDQ_018545 | speed of sound | sound waves travel more quickly through dry air than moist air. | null | null | Multiple Choice | a. true, b. false | b |
14,992 | NDQ_018546 | speed of sound | the speed of sound through air is fastest when the air temperature is | null | null | Multiple Choice | a. 0 °C., b. 20 °C., c. 40 °C., d. 60 °C. | d |
14,993 | NDQ_018563 | static electricity and static discharge | electric charges can travel easily through dry air. | null | null | Multiple Choice | a. true, b. false | b |
14,994 | NDQ_018566 | static electricity and static discharge | lighting can occur between a cloud and | null | null | Multiple Choice | a. another part of the same cloud., b. a different cloud., c. the ground., d. any of the above | d |
14,995 | NDQ_018567 | static electricity and static discharge | lightning is an example of static discharge. | null | null | Multiple Choice | a. true, b. false | a |
14,996 | NDQ_018568 | static electricity and static discharge | during a rainstorm, negative charges become concentrated at the | null | null | Multiple Choice | a. surface of the ground., b. top of the clouds., c. base of the clouds., d. two of the above | c |
14,997 | NDQ_018580 | surface wave | a surface wave is one type of mechanical wave. | null | null | Multiple Choice | a. true, b. false | a |
14,998 | NDQ_018582 | surface wave | an ocean wave is an example of a surface wave. | null | null | Multiple Choice | a. true, b. false | a |
14,999 | NDQ_018585 | surface wave | in deep water, how do particles of water move when a surface wave passes through them? | null | null | Multiple Choice | a. up and down, b. back and forth, c. in an overall circular motion, d. all of the above | d |
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