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14,700 | NDQ_017625 | magnets | if you cut a bar magnet in half, one half will have just a north pole and the other half will have just a south pole. | null | null | Multiple Choice | a. true, b. false | b |
14,701 | NDQ_017628 | magnets | a magnets force is | null | null | Multiple Choice | a. a force of repulsion only., b. a force of attraction only., c. exerted over a distance., d. two of the above | c |
14,702 | NDQ_017629 | magnets | when two magnets are brought close together, their magnetic fields interact. | null | null | Multiple Choice | a. true, b. false | a |
14,703 | NDQ_017630 | magnets | lines of force around two magnetic poles push apart when | null | null | Multiple Choice | a. both poles are north poles., b. both poles are south poles., c. one pole is a north pole and one pole is a south pole., d. two of the above | d |
14,704 | NDQ_017643 | mechanical advantage | ways that machines may make work easier include changing the | null | null | Multiple Choice | a. amount of force applied., b. distance over which force is applied., c. direction in which force is applied., d. any of the above | d |
14,705 | NDQ_017646 | mechanical advantage | the equation for calculating actual mechanical advantage is | null | null | Multiple Choice | a. Actual Mechanical Advantage = Input Force/Output Force., b. Actual Mechanical Advantage = Input Distance/Output Distance., c. Actual Mechanical Advantage = Output Force/Input Force., d. Actual Mechanical Advantage = Output Distance/Input Distance. | c |
14,706 | NDQ_017647 | mechanical advantage | the equation for calculating ideal mechanical advantage is | null | null | Multiple Choice | a. Ideal Mechanical Advantage = Input Force/Output Force., b. Ideal Mechanical Advantage = Input Distance/Output Distance., c. Ideal Mechanical Advantage = Output Force/Input Force., d. Ideal Mechanical Advantage = Output Distance/Input Distance. | b |
14,707 | NDQ_017650 | mechanical advantage | the mechanical advantage of a machine may be less than, equal to, or greater than 1. | null | null | Multiple Choice | a. true, b. false | a |
14,708 | NDQ_017653 | mechanical wave | types of mechanical waves include | null | null | Multiple Choice | a. transverse waves., b. longitudinal waves., c. surface waves., d. all of the above | d |
14,709 | NDQ_017655 | mechanical wave | mechanical waves can travel through liquids and gases but not through solids. | null | null | Multiple Choice | a. true, b. false | b |
14,710 | NDQ_017657 | mechanical wave | particles of the medium actually travel along with a mechanical wave. | null | null | Multiple Choice | a. true, b. false | b |
14,711 | NDQ_017659 | mechanical wave | in which type of wave do particles of the medium move in small circles? | null | null | Multiple Choice | a. surface wave, b. transverse wave, c. longitudinal wave, d. none of the above | a |
14,712 | NDQ_017660 | mechanical wave | a longitudinal wave is a combination of a transverse wave and a surface wave. | null | null | Multiple Choice | a. true, b. false | b |
14,713 | NDQ_017672 | mendeleevs periodic table | atomic mass is an atoms number of | null | null | Multiple Choice | a. protons., b. neutrons., c. protons plus electrons., d. protons plus neutrons. | b |
14,714 | NDQ_017675 | mendeleevs periodic table | elements in a given period of mendeleevs table have similar properties. | null | null | Multiple Choice | a. true, b. false | b |
14,715 | NDQ_017677 | mendeleevs periodic table | in mendeleevs table, how many elements are there in each period? | null | null | Multiple Choice | a. 4, b. 8, c. 12, d. 18 | b |
14,716 | NDQ_017680 | mendeleevs periodic table | only some of the unknown elements that mendeleev predicted were ever discovered. | null | null | Multiple Choice | a. true, b. false | b |
14,717 | NDQ_017683 | metallic bonding | the lattice-like structure of a metal consists of negative metal ions in a sea of electrons. | null | null | Multiple Choice | a. true, b. false | b |
14,718 | NDQ_017684 | metallic bonding | properties of metals that are possible because of their freely moving electrons include the ability to | null | null | Multiple Choice | a. conduct electricity., b. bend without breaking., c. form hydrogen bonds., d. two of the above | d |
14,719 | NDQ_017685 | metallic bonding | a metallic bond forms when one metal atom shares a pair of electrons with another metal atom. | null | null | Multiple Choice | a. true, b. false | b |
14,720 | NDQ_017686 | metallic bonding | metallic bonds form only between atoms of two or more different metals. | null | null | Multiple Choice | a. true, b. false | b |
14,721 | NDQ_017688 | metallic bonding | in the lattice-like structure of a metal | null | null | Multiple Choice | a. metal ions can move freely., b. valence electrons are in fixed positions., c. pairs of ions and electrons can move freely., d. none of the above | d |
14,722 | NDQ_017689 | metallic bonding | which of the following elements form(s) metallic bonds? | null | null | Multiple Choice | a. iron, b. oxygen, c. carbon, d. two of the above | a |
14,723 | NDQ_017691 | metalloids | which of the following elements is not a metalloid? | null | null | Multiple Choice | a. arsenic, b. boron, c. carbon, d. gemanium | c |
14,724 | NDQ_017692 | metalloids | the metalloid class is the smallest class of elements. | null | null | Multiple Choice | a. true, b. false | a |
14,725 | NDQ_017693 | metalloids | how many valence electrons do metalloids have? | null | null | Multiple Choice | a. 1–2, b. 2–4, c. 3–6, d. 6–8 | c |
14,726 | NDQ_017696 | metalloids | metalloids are generally | null | null | Multiple Choice | a. dull., b. brittle., c. ductile., d. malleable. | b |
14,727 | NDQ_017697 | metalloids | some metalloids are liquids at room temperature. | null | null | Multiple Choice | a. true, b. false | b |
14,728 | NDQ_017698 | metalloids | metalloids fall between metals and nonmetals in the periodic table. | null | null | Multiple Choice | a. true, b. false | a |
14,729 | NDQ_017703 | metals | metals are the largest of the three classes of elements. | null | null | Multiple Choice | a. true, b. false | a |
14,730 | NDQ_017704 | metals | properties of most metals include | null | null | Multiple Choice | a. high melting point., b. ability to conduct heat., c. shiny appearance., d. all of the above | d |
14,731 | NDQ_017708 | metals | some metals are gases at room temperature. | null | null | Multiple Choice | a. true, b. false | b |
14,732 | NDQ_017709 | metals | the properties of metals depend mainly on their number and arrangement of neutrons. | null | null | Multiple Choice | a. true, b. false | b |
14,733 | NDQ_017712 | microwaves | electromagnetic waves vary in their | null | null | Multiple Choice | a. speed., b. frequency., c. wavelength., d. two of the above | d |
14,734 | NDQ_017713 | microwaves | the electromagnetic spectrum is defined as the full range of colors of visible light. | null | null | Multiple Choice | a. true, b. false | b |
14,735 | NDQ_017714 | microwaves | microwaves have lower frequencies than other radio waves. | null | null | Multiple Choice | a. true, b. false | b |
14,736 | NDQ_017715 | microwaves | microwaves are used for | null | null | Multiple Choice | a. heating food., b. cell phone transmissions., c. radar., d. all of the above | d |
14,737 | NDQ_017717 | microwaves | microwave signals can be interrupted by buildings and other obstructions. | null | null | Multiple Choice | a. true, b. false | a |
14,738 | NDQ_017719 | microwaves | radar is used for | null | null | Multiple Choice | a. computing the speed of vehicles., b. detecting air traffic., c. tracking storms., d. all of the above | d |
14,739 | NDQ_017723 | mirrors | the shape of a mirrors surface determines the type of image that it forms. | null | null | Multiple Choice | a. true, b. false | a |
14,740 | NDQ_017724 | mirrors | a real image | null | null | Multiple Choice | a. forms in front of a mirror., b. forms where rays of light actually meet., c. is always smaller than the reflected object., d. two of the above | d |
14,741 | NDQ_017725 | mirrors | a virtual image | null | null | Multiple Choice | a. appears to be behind the mirror., b. doesn’t really exist., c. is always larger than the reflected object., d. two of the above | d |
14,742 | NDQ_017727 | mirrors | the type of mirror in question 6 always forms real images. | null | null | Multiple Choice | a. true, b. false | b |
14,743 | NDQ_017729 | mirrors | the type of mirror in question 8 always forms life-sized images. | null | null | Multiple Choice | a. true, b. false | b |
14,744 | NDQ_017730 | mirrors | which statement about convex mirrors is true? | null | null | Multiple Choice | a. They curve outward like the outside of a bowl., b. They form only real images., c. They form only enlarged images., d. two of the above | a |
14,745 | NDQ_017741 | modern periodic table | the modern periodic table is based on mendeleevs earlier periodic table. | null | null | Multiple Choice | a. true, b. false | a |
14,746 | NDQ_017743 | modern periodic table | each element has a unique atomic number. | null | null | Multiple Choice | a. true, b. false | a |
14,747 | NDQ_017744 | modern periodic table | how many groups are there in the modern periodic table? | null | null | Multiple Choice | a. 7, b. 8, c. 12, d. 18 | b |
14,748 | NDQ_017745 | modern periodic table | all the periods of the modern periodic table contain the same number of elements. | null | null | Multiple Choice | a. true, b. false | b |
14,749 | NDQ_017746 | modern periodic table | the number of each period in the modern periodic table represents the number of | null | null | Multiple Choice | a. energy levels containing electrons., b. electrons in each energy level., c. protons plus neutrons in the nucleus., d. none of the above | a |
14,750 | NDQ_017753 | molecular compounds | in covalent compounds, elements are held together by the force of attraction between oppositely charged atoms. | null | null | Multiple Choice | a. true, b. false | b |
14,751 | NDQ_017754 | molecular compounds | covalent compounds form structures called crystals. | null | null | Multiple Choice | a. true, b. false | b |
14,752 | NDQ_017755 | molecular compounds | prefixes may be used in the name of a molecular compound to represent the numbers of each atom in a molecule of the compound. which prefix represents five atoms? | null | null | Multiple Choice | a. tetra-, b. tri-, c. hexa-, d. penta- | c |
14,753 | NDQ_017756 | molecular compounds | which of the following is a correct rule for naming molecular compounds? | null | null | Multiple Choice | a. The name of the element closer to the left side of the periodic table comes first., b. The name of the element closer to the right side of the periodic table comes first., c. The name of the element closer to the bottom of the periodic table comes first., d. The name of the element closer to the top of the periodic table comes first. | a |
14,754 | NDQ_017760 | molecular compounds | which of the following is a property of most molecular compounds? | null | null | Multiple Choice | a. ability to dissolve in water, b. ability to burn easily, c. ability to conduct electricity, d. very high boiling point | b |
14,755 | NDQ_017762 | momentum | factors that determine an objects momentum include its | null | null | Multiple Choice | a. mass., b. velocity., c. acceleration., d. two of the above | d |
14,756 | NDQ_017763 | momentum | all objects with mass have momentum. | null | null | Multiple Choice | a. true, b. false | b |
14,757 | NDQ_017765 | momentum | to calculate an objects momentum, you would use the formula | null | null | Multiple Choice | a. momentum = mass x acceleration., b. momentum = mass x velocity., c. momentum = mass/acceleration., d. momentum = mass/velocity. | b |
14,758 | NDQ_017767 | momentum | which football player has greater momentum? | null | null | Multiple Choice | a. Ted: mass = 60 kg, velocity = 2.0 m/s, b. Todd: mass = 80 kg, velocity = 1.7 m/s, c. Tom: mass = 90 kg, velocity = 1.5 m/s, d. Tim: mass = 100 kg, velocity = 1.2 m/s | b |
14,759 | NDQ_017768 | momentum | which football players in question 7 have the same momentum? | null | null | Multiple Choice | a. Ted and Todd, b. Todd and Tom, c. Ted and Tim, d. none of the above | c |
14,760 | NDQ_017770 | momentum | the faster an object is moving, the harder it is to stop. | null | null | Multiple Choice | a. true, b. false | a |
14,761 | NDQ_017774 | motion | aspects of motion include speed and direction. | null | null | Multiple Choice | a. true, b. false | a |
14,762 | NDQ_017776 | motion | if you are riding on a bus with a friend, you can tell you are moving by observing the motion of | null | null | Multiple Choice | a. your friend in the seat beside you., b. the bus driver at the front of the bus., c. objects like trees and houses outside the windows., d. two of the above | c |
14,763 | NDQ_017777 | motion | in question 6, what is your frame of reference for detecting the motion of the bus? | null | null | Multiple Choice | a. your friend, b. the bus driver, c. objects outside the windows, d. two of the above | c |
14,764 | NDQ_017778 | motion | in question 6, the bus drivers frame of reference is the passenger directly behind him. | null | null | Multiple Choice | a. true, b. false | b |
14,765 | NDQ_017779 | motion | in question 6, the frame of reference of an outside observer of the bus might be a house across the street. | null | null | Multiple Choice | a. true, b. false | a |
14,766 | NDQ_017780 | motion | if you are sitting on a stationary bus, which frame of reference might may you think the bus has started moving? | null | null | Multiple Choice | a. The car in the next lane starts moving., b. A passenger moves to the back of the bus., c. The bus driver turns to look through the windshield., d. none of the above | a |
14,767 | NDQ_017781 | musical instruments | people have been using sound to make music for thousands of years. | null | null | Multiple Choice | a. true, b. false | a |
14,768 | NDQ_017782 | musical instruments | there are a total of 50 different kinds of musical instruments. | null | null | Multiple Choice | a. true, b. false | b |
14,769 | NDQ_017783 | musical instruments | all musical instruments make sound by causing something to vibrate. | null | null | Multiple Choice | a. true, b. false | a |
14,770 | NDQ_017786 | musical instruments | when instruments change the frequency of sound waves, the sound changes | null | null | Multiple Choice | a. pitch., b. amplitude., c. loudness., d. all of the above | a |
14,771 | NDQ_017787 | musical instruments | categories of musical instruments include | null | null | Multiple Choice | a. wind instruments., b. stringed instruments., c. percussion instruments., d. all of the above | d |
14,772 | NDQ_017789 | musical instruments | blowing into a clarinet starts vibrations in a thin wooden | null | null | Multiple Choice | a. reed., b. bell., c. key., d. none of the above | a |
14,773 | NDQ_017805 | nature of technology | what was the first step in the development of solar car technology? | null | null | Multiple Choice | a. development of a model solar car, b. design of a solar panel, c. invention of the solar cell, d. launch of the World Solar Challenge | c |
14,774 | NDQ_017806 | nature of technology | technology may include | null | null | Multiple Choice | a. materials., b. devices., c. processes., d. all of the above | d |
14,775 | NDQ_017811 | neutrons | atoms of all elements have neutrons in their nucleus. | null | null | Multiple Choice | a. true, b. false | b |
14,776 | NDQ_017813 | neutrons | neutrons have a negative electrical charge. | null | null | Multiple Choice | a. true, b. false | b |
14,777 | NDQ_017814 | neutrons | the mass of a neutron is close to the mass of | null | null | Multiple Choice | a. an electron., b. a proton., c. the nucleus., d. none of the above | b |
14,778 | NDQ_017815 | neutrons | a neutron has about the same diameter as a proton. | null | null | Multiple Choice | a. true, b. false | a |
14,779 | NDQ_017816 | neutrons | atoms of the same element may differ in their numbers of neutrons. | null | null | Multiple Choice | a. true, b. false | a |
14,780 | NDQ_017818 | neutrons | each neutron contains | null | null | Multiple Choice | a. three quarks and three gluons., b. two up quarks and one down quark., c. two quarks and one gluon., d. two gluons and one quark. | a |
14,781 | NDQ_017822 | newtons first law | without an unbalanced force acting on it, a moving object will | null | null | Multiple Choice | a. keep moving., b. maintain a constant speed., c. keep going in the same direction., d. all of the above | d |
14,782 | NDQ_017828 | newtons first law | if you dont try to stop a rolling skateboard, it will keep moving forever. | null | null | Multiple Choice | a. true, b. false | b |
14,783 | NDQ_017829 | newtons first law | pressing down on one side of a skateboard causes it to turn toward the opposite side. | null | null | Multiple Choice | a. true, b. false | a |
14,784 | NDQ_017830 | newtons first law | if you run into a curb on a skateboard, you will fall forward off your skateboard because there is an unbalanced force applied to your body. | null | null | Multiple Choice | a. true, b. false | b |
14,785 | NDQ_017832 | newtons law of gravity | isaac newton was the first person to observe the effects of gravity. | null | null | Multiple Choice | a. true, b. false | b |
14,786 | NDQ_017834 | newtons law of gravity | newton would agree that all objects on earth exert a gravitational pull on earth. | null | null | Multiple Choice | a. true, b. false | a |
14,787 | NDQ_017835 | newtons law of gravity | newtons law of gravity was the first scientific law that applied to everything in the universe. | null | null | Multiple Choice | a. true, b. false | a |
14,788 | NDQ_017837 | newtons law of gravity | the equation that newtons developed to calculate the force of gravity between two gm1m 2 . in this equation, the letter g represents the objects is fg = | null | null | Multiple Choice | a. force of gravity., b. combined masses of the objects., c. universal gravitational constant., d. none of the above | c |
14,789 | NDQ_017838 | newtons law of gravity | what does the letter r represent in the equation in question 7? | null | null | Multiple Choice | a. rotation, b. revolution, c. distance, d. none of the above | c |
14,790 | NDQ_017842 | newtons second law | acceleration occurs whenever an object is acted on by an unbalanced force. | null | null | Multiple Choice | a. true, b. false | a |
14,791 | NDQ_017843 | newtons second law | factors that affect the acceleration of an object include the | null | null | Multiple Choice | a. net force acting on the object., b. object’s speed., c. object’s mass., d. two of the above | d |
14,792 | NDQ_017845 | newtons second law | there is a direct relationship between acceleration and mass. | null | null | Multiple Choice | a. true, b. false | b |
14,793 | NDQ_017846 | newtons second law | increasing the force acting on an object increases its acceleration. | null | null | Multiple Choice | a. true, b. false | a |
14,794 | NDQ_017848 | newtons second law | if the net force acting on an object increases by 50 percent, then the acceleration of the object will | null | null | Multiple Choice | a. decrease by 50 percent., b. increase by 100 percent., c. stay the same., d. none of the above | d |
14,795 | NDQ_017849 | newtons second law | which equation shows the relationships among acceleration, mass, and net force? | null | null | Multiple Choice | a. acceleration = net force x mass, b. acceleration =- net force/mass, c. acceleration = mass/net force, d. none of the above | b |
14,796 | NDQ_017852 | newtons third law | forces always act in pairs. | null | null | Multiple Choice | a. true, b. false | a |
14,797 | NDQ_017853 | newtons third law | the reaction to an action is always | null | null | Multiple Choice | a. equal in strength to the action., b. in the same direction as the action., c. in the opposite direction to the action., d. two of the above | d |
14,798 | NDQ_017854 | newtons third law | a stronger action always results in a stronger reaction. | null | null | Multiple Choice | a. true, b. false | a |
14,799 | NDQ_017855 | newtons third law | action and reaction forces always cancel each other out. | null | null | Multiple Choice | a. true, b. false | b |
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