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13,400 | NDQ_014522 | optics | The image formed by a convex mirror is always upright and reduced in size. | null | null | Multiple Choice | a. true, b. false | a |
13,401 | NDQ_014523 | optics | Light travels more quickly through glass than through air. | null | null | Multiple Choice | a. true, b. false | b |
13,402 | NDQ_014524 | optics | The more curved the surface of a lens is, the more it refracts light. | null | null | Multiple Choice | a. true, b. false | a |
13,403 | NDQ_014525 | optics | The lens in a camera is a convex lens. | null | null | Multiple Choice | a. true, b. false | b |
13,404 | NDQ_014526 | optics | A refracting telescope uses a convex lens to collect and focus light. | null | null | Multiple Choice | a. true, b. false | a |
13,405 | NDQ_014527 | optics | The image of an object that is formed by a concave mirror is always | null | null | Multiple Choice | a. real., b. virtual., c. upright., d. none of the above | d |
13,406 | NDQ_014528 | optics | Which statement about concave lenses is true? | null | null | Multiple Choice | a. They are thicker in the middle than at the edges., b. They cause rays of light to diverge., c. They form upside-down images., d. They form enlarged images. | b |
13,407 | NDQ_014529 | optics | Whether a convex lens forms a real or virtual image depends on | null | null | Multiple Choice | a. where the object is located relative to the focus., b. whether the object is placed right-side up., c. how large the object is., d. how curved the lens is. | a |
13,408 | NDQ_014530 | optics | Optical instruments include | null | null | Multiple Choice | a. microscopes., b. telescopes., c. cameras., d. all of the above | d |
13,409 | NDQ_014531 | optics | Both microscopes and telescopes use | null | null | Multiple Choice | a. concave lenses., b. convex lenses., c. convex mirrors., d. all of the above | b |
13,410 | NDQ_014532 | optics | The image produced by a camera is | null | null | Multiple Choice | a. virtual., b. enlarged., c. reduced., d. two of the above | d |
13,411 | NDQ_014533 | optics | A laser device produces a very focused beam of light by | null | null | Multiple Choice | a. lining up the crests and troughs of light waves., b. using only very high frequencies of light waves., c. using convex lenses to enlarge light waves., d. shining light waves through an optical fiber. | a |
13,412 | NDQ_014534 | vision | Structures of the eye that help to focus light include the | null | null | Multiple Choice | a. iris., b. cornea., c. retina., d. two of the above | b |
13,413 | NDQ_014535 | vision | Which statement about the lens of the eye is true? | null | null | Multiple Choice | a. It is a concave lens., b. Its shape is controlled by muscles., c. It is the only structure in the eye to focus light., d. all of the above | b |
13,414 | NDQ_014536 | vision | Which choice shows the correct order in which light passes through structures of the eye? | null | null | Multiple Choice | a. lens, pupil, cornea, b. pupil, cornea, lens, c. cornea, pupil, lens, d. cornea, lens, pupil | c |
13,415 | NDQ_014537 | vision | Images form inside the eye on the | null | null | Multiple Choice | a. cornea., b. iris., c. pupil., d. retina. | d |
13,416 | NDQ_014538 | vision | Why does the pupil of the eye look black? | null | null | Multiple Choice | a. It reflects only black light., b. It does not reflect any light., c. It consists of a black membrane., d. It absorbs all the light that strikes it. | b |
13,417 | NDQ_014539 | vision | The colored part of the eye is the | null | null | Multiple Choice | a. lens., b. rod., c. iris., d. cone. | c |
13,418 | NDQ_014540 | vision | The function of the structure in question 3 is to | null | null | Multiple Choice | a. change images to electrical signals., b. fine-tune the focus of light., c. control the size of the pupil., d. adjust the position of the lens. | c |
13,419 | NDQ_014541 | vision | Functions of the cornea of the eye include | null | null | Multiple Choice | a. protecting the eye from injury., b. adjusting the position of the lens., c. controlling how much light enters the eye., d. two of the above | a |
13,420 | NDQ_014542 | vision | The image formed on the retina by the lens of the eye is | null | null | Multiple Choice | a. virtual., b. enlarged., c. upside-down., d. two of the above | c |
13,421 | NDQ_014543 | vision | Electrical signals from the retina reach the brain through the | null | null | Multiple Choice | a. visual nerve., b. optic nerve., c. optic rod., d. electrical rod. | b |
13,422 | NDQ_014545 | vision | Which statement about myopia is true? | null | null | Multiple Choice | a. It is also called farsightedness., b. It can be corrected with convex lenses., c. It occurs when the eyeball is longer than normal., d. It causes both near and distant objects to appear blurry. | c |
13,423 | NDQ_014546 | vision | What happens when the eyeball is shorter than normal? | null | null | Multiple Choice | a. Images are focused in back of the retina., b. Distant objects are seen clearly., c. Nearby objects appear blurry., d. all of the above | d |
13,424 | NDQ_014554 | vision | One function of the cornea is to protect the eye. | null | null | Multiple Choice | a. true, b. false | a |
13,425 | NDQ_014556 | vision | The role of the pupil is to help focus light. | null | null | Multiple Choice | a. true, b. false | b |
13,426 | NDQ_014559 | vision | Images formed by the eye are upright and virtual. | null | null | Multiple Choice | a. true, b. false | b |
13,427 | NDQ_014561 | vision | We can see only if information from the eyes reaches the brain. | null | null | Multiple Choice | a. true, b. false | a |
13,428 | NDQ_014562 | vision | Rods can sense dim light but not colors of light. | null | null | Multiple Choice | a. true, b. false | a |
13,429 | NDQ_014563 | vision | The eyes and brain work together to enable vision. | null | null | Multiple Choice | a. true, b. false | a |
13,430 | NDQ_014564 | vision | The pupil helps to focus light that enters the eye. | null | null | Multiple Choice | a. true, b. false | b |
13,431 | NDQ_014565 | vision | The lens changes shape to focus images of close or distant objects. | null | null | Multiple Choice | a. true, b. false | a |
13,432 | NDQ_014566 | vision | There are two different types of rods in the retina. | null | null | Multiple Choice | a. true, b. false | b |
13,433 | NDQ_014567 | vision | The brain interprets signals from the retina as shape, color, and brightness. | null | null | Multiple Choice | a. true, b. false | a |
13,434 | NDQ_014568 | vision | The brain interprets images on the retina as though they were upright. | null | null | Multiple Choice | a. true, b. false | a |
13,435 | NDQ_014569 | vision | Laser surgery corrects vision problems by changing the shape of the lens. | null | null | Multiple Choice | a. true, b. false | b |
13,436 | NDQ_014570 | vision | The role of the iris is to control the size of the pupil. | null | null | Multiple Choice | a. true, b. false | a |
13,437 | NDQ_014571 | vision | The lens normally focuses images on the optic nerve. | null | null | Multiple Choice | a. true, b. false | b |
13,438 | NDQ_014572 | vision | Hyperopia is also called nearsightedness. | null | null | Multiple Choice | a. true, b. false | b |
13,439 | NDQ_014573 | vision | nerve cell in the retina that senses dim light | null | null | Multiple Choice | a. eye, b. rod, c. cornea, d. cone, e. iris, f. retina, g. pupil | b |
13,440 | NDQ_014574 | vision | colored part of the eye | null | null | Multiple Choice | a. eye, b. rod, c. cornea, d. cone, e. iris, f. retina, g. pupil | e |
13,441 | NDQ_014575 | vision | opening at the front of the eye that lets in light | null | null | Multiple Choice | a. eye, b. rod, c. cornea, d. cone, e. iris, f. retina, g. pupil | g |
13,442 | NDQ_014576 | vision | nerve cell in the retina that senses colors of light | null | null | Multiple Choice | a. eye, b. rod, c. cornea, d. cone, e. iris, f. retina, g. pupil | d |
13,443 | NDQ_014577 | vision | organ specialized to collect light and focus images | null | null | Multiple Choice | a. eye, b. rod, c. cornea, d. cone, e. iris, f. retina, g. pupil | a |
13,444 | NDQ_014578 | vision | transparent outer covering of the eye | null | null | Multiple Choice | a. eye, b. rod, c. cornea, d. cone, e. iris, f. retina, g. pupil | c |
13,445 | NDQ_014579 | vision | membrane lining the back of the eye | null | null | Multiple Choice | a. eye, b. rod, c. cornea, d. cone, e. iris, f. retina, g. pupil | f |
13,446 | NDQ_014764 | magnets and magnetism | A maglev train can hover above the track without touching it because of | null | null | Multiple Choice | a. friction., b. magnetic force., c. static electricity., d. none of the above | b |
13,447 | NDQ_014766 | magnets and magnetism | Ferromagnetic materials include | null | null | Multiple Choice | a. iron., b. nickel., c. cobalt., d. all of the above | d |
13,448 | NDQ_014768 | magnets and magnetism | If a magnet is allowed to move freely, its north and south poles will always | null | null | Multiple Choice | a. line up with Earths north-south axis., b. keep changing places., c. point east and west., d. repel each other. | a |
13,449 | NDQ_014769 | magnets and magnetism | How is magnetic force like electric force? | null | null | Multiple Choice | a. It is caused by moving electrons., b. It generates a force field., c. It acts over a distance., d. all of the above | d |
13,450 | NDQ_014772 | magnets and magnetism | Magnetic domains in a ferromagnetic material are most likely to align in the same direction when the material is | null | null | Multiple Choice | a. heated to a high temperature., b. placed near a magnet., c. dropped on a hard surface., d. two of the above | b |
13,451 | NDQ_014777 | magnets and magnetism | Some magnets have just one magnetic pole. | null | null | Multiple Choice | a. true, b. false | b |
13,452 | NDQ_014780 | magnets and magnetism | Bringing together the north poles of two magnets demagnetizes them. | null | null | Multiple Choice | a. true, b. false | b |
13,453 | NDQ_014782 | magnets and magnetism | A magnet will attract any material that contains iron. | null | null | Multiple Choice | a. true, b. false | a |
13,454 | NDQ_014783 | magnets and magnetism | An atom is a tiny magnet because its electrons spin around its nucleus. | null | null | Multiple Choice | a. true, b. false | a |
13,455 | NDQ_014784 | magnets and magnetism | Only ferromagnetic materials are affected by magnetic force. | null | null | Multiple Choice | a. true, b. false | a |
13,456 | NDQ_014785 | magnets and magnetism | Copper and aluminum are attracted by magnets. | null | null | Multiple Choice | a. true, b. false | b |
13,457 | NDQ_014786 | magnets and magnetism | For a ferromagnetic material to become magnetic its magnetic domains must be aligned. | null | null | Multiple Choice | a. true, b. false | a |
13,458 | NDQ_014787 | magnets and magnetism | Iron is the only ferromagnetic material. | null | null | Multiple Choice | a. true, b. false | b |
13,459 | NDQ_014788 | magnets and magnetism | Only temporary magnets can be demagnetized. | null | null | Multiple Choice | a. true, b. false | b |
13,460 | NDQ_014789 | magnets and magnetism | While paper clips are clinging to a bar magnet, they are temporary magnets. | null | null | Multiple Choice | a. true, b. false | a |
13,461 | NDQ_014790 | magnets and magnetism | The most magnetic material in nature is magnetite. | null | null | Multiple Choice | a. true, b. false | a |
13,462 | NDQ_014791 | magnets and magnetism | An iron nail can be turned into a permanent magnet. | null | null | Multiple Choice | a. true, b. false | a |
13,463 | NDQ_014792 | magnets and magnetism | Permanent magnets can never be demagnetized. | null | null | Multiple Choice | a. true, b. false | b |
13,464 | NDQ_014793 | magnets and magnetism | Magnetite is a naturally occurring permanent magnet. | null | null | Multiple Choice | a. true, b. false | a |
13,465 | NDQ_014794 | magnets and magnetism | The magnetic properties of lodestone were discovered only recently. | null | null | Multiple Choice | a. true, b. false | b |
13,466 | NDQ_014795 | magnets and magnetism | force of attraction or repulsion exerted by a magnet | null | null | Multiple Choice | a. ferromagnetic material, b. magnet, c. magnetic domain, d. magnetic field, e. magnetic force, f. magnetic pole, g. magnetism | e |
13,467 | NDQ_014796 | magnets and magnetism | object that attracts ferromagnetic materials | null | null | Multiple Choice | a. ferromagnetic material, b. magnet, c. magnetic domain, d. magnetic field, e. magnetic force, f. magnetic pole, g. magnetism | b |
13,468 | NDQ_014797 | magnets and magnetism | iron, nickel, or cobalt | null | null | Multiple Choice | a. ferromagnetic material, b. magnet, c. magnetic domain, d. magnetic field, e. magnetic force, f. magnetic pole, g. magnetism | a |
13,469 | NDQ_014798 | magnets and magnetism | north or south end of a magnet | null | null | Multiple Choice | a. ferromagnetic material, b. magnet, c. magnetic domain, d. magnetic field, e. magnetic force, f. magnetic pole, g. magnetism | f |
13,470 | NDQ_014799 | magnets and magnetism | area around a magnet where it exerts force | null | null | Multiple Choice | a. ferromagnetic material, b. magnet, c. magnetic domain, d. magnetic field, e. magnetic force, f. magnetic pole, g. magnetism | d |
13,471 | NDQ_014800 | magnets and magnetism | ability of a material to respond to and exert magnetic force | null | null | Multiple Choice | a. ferromagnetic material, b. magnet, c. magnetic domain, d. magnetic field, e. magnetic force, f. magnetic pole, g. magnetism | g |
13,472 | NDQ_014801 | magnets and magnetism | area of a ferromagnetic material where the poles of atoms are aligned in the same direction | null | null | Multiple Choice | a. ferromagnetic material, b. magnet, c. magnetic domain, d. magnetic field, e. magnetic force, f. magnetic pole, g. magnetism | c |
13,473 | NDQ_014802 | magnets and magnetism | Why are the poles of a magnet called north and south poles? | null | null | Multiple Choice | a. One pole is positive and one pole is negative., b. The poles are at opposite ends of the magnet., c. The poles are the coldest parts of the magnet., d. The poles line up with Earths north-south axis. | d |
13,474 | NDQ_014803 | magnets and magnetism | What happens if you cut a bar magnet in half between the north and south poles? | null | null | Multiple Choice | a. One half has a north pole and one half has a south pole., b. Each half is a stronger magnet than the original magnet., c. Each half has both a north pole and a south pole., d. The two halves are no longer magnetic. | c |
13,475 | NDQ_014804 | magnets and magnetism | Which statement about magnetic force is false? | null | null | Multiple Choice | a. It is exerted over a distance., b. It affects only certain types of matter., c. It includes forces of attraction and repulsion., d. It acts only on materials that are touching a magnet. | d |
13,476 | NDQ_014805 | magnets and magnetism | Which of the following materials is attracted to a magnet? | null | null | Multiple Choice | a. aluminum, b. copper, c. glass, d. steel | d |
13,477 | NDQ_014806 | magnets and magnetism | A material that can be magnetized | null | null | Multiple Choice | a. has magnetic domains., b. is called ferromagnetic., c. must contain iron., d. two of the above | d |
13,478 | NDQ_014807 | magnets and magnetism | If you place a paper clip very close to a magnet, the paper clip | null | null | Multiple Choice | a. is attracted to the magnet., b. moves toward the magnet., c. becomes a temporary magnet., d. all of the above | d |
13,479 | NDQ_014808 | magnets and magnetism | Magnetism is caused by the | null | null | Multiple Choice | a. attraction between protons and neutrons of atoms., b. attraction between positive and negative ions., c. movement of electrons within atoms., d. none of the above | c |
13,480 | NDQ_014809 | earth as a magnet | The north end of a compass needle always points to 90 north latitude. | null | null | Multiple Choice | a. true, b. false | b |
13,481 | NDQ_014810 | earth as a magnet | The idea that Earth is a magnet was first proposed in | null | null | Multiple Choice | a. 1600., b. 1700., c. 1800., d. 1900. | a |
13,482 | NDQ_014811 | earth as a magnet | Earths magnetic field extends outward from the planet in all directions. | null | null | Multiple Choice | a. true, b. false | a |
13,483 | NDQ_014812 | earth as a magnet | The magnetosphere is | null | null | Multiple Choice | a. a huge region., b. strongest at the poles., c. the region where Earth exerts magnetic force., d. all of the above | d |
13,484 | NDQ_014813 | earth as a magnet | Earths magnetic poles have switched places many times over the past hundred years. | null | null | Multiple Choice | a. true, b. false | b |
13,485 | NDQ_014814 | earth as a magnet | What causes Earths magnetism? | null | null | Multiple Choice | a. The movement of charged particles in Earths outer core., b. The revolution of Earth around the sun., c. The magnetism of the sun., d. none of the above | a |
13,486 | NDQ_014815 | earth as a magnet | Evidence for magnetic field reversals comes from | null | null | Multiple Choice | a. rocks on the ocean floor., b. metals in Earths liquid core., c. measurements of Earths magnetosphere., d. seismograph readings from inside Earth. | a |
13,487 | NDQ_014816 | earth as a magnet | Once molten rocks harden, their magnetic domains are frozen in place forever. | null | null | Multiple Choice | a. true, b. false | a |
13,488 | NDQ_014817 | earth as a magnet | Earths outer core is made up mainly of iron and nickel. | null | null | Multiple Choice | a. true, b. false | a |
13,489 | NDQ_014818 | earth as a magnet | Earths magnetic field is beneficial to living things because it | null | null | Multiple Choice | a. protects them from harmful particles., b. can be used for navigation., c. never changes., d. two of the above | d |
13,490 | NDQ_014820 | earth as a magnet | Charged particles move inside Earth when it spins on its axis. | null | null | Multiple Choice | a. true, b. false | a |
13,491 | NDQ_014821 | earth as a magnet | Harmful particles from the sun are repelled by Earths magnetic poles. | null | null | Multiple Choice | a. true, b. false | b |
13,492 | NDQ_014823 | earth as a magnet | Magnetic reversals were discovered by William Gilbert in 1600. | null | null | Multiple Choice | a. true, b. false | b |
13,493 | NDQ_014826 | earth as a magnet | Earths south magnetic pole is the same as Earths south geographic pole. | null | null | Multiple Choice | a. true, b. false | b |
13,494 | NDQ_014828 | earth as a magnet | Migrating birds may detect Earths magnetic field with structures in their eyes. | null | null | Multiple Choice | a. true, b. false | a |
13,495 | NDQ_014829 | earth as a magnet | Earth has north and south magnetic poles like a bar magnet. | null | null | Multiple Choice | a. true, b. false | a |
13,496 | NDQ_014830 | earth as a magnet | Like a bar magnet, planet Earth | null | null | Multiple Choice | a. exerts magnetic force., b. has a magnetic field., c. has magnetic poles., d. all of the above | d |
13,497 | NDQ_014831 | earth as a magnet | Earths magnetic and geographic poles are located in the same places. | null | null | Multiple Choice | a. true, b. false | b |
13,498 | NDQ_014832 | earth as a magnet | Earths true north magnetic pole is actually located near Earths | null | null | Multiple Choice | a. equator., b. south magnetic pole., c. south geographic pole., d. none of the above | c |
13,499 | NDQ_014833 | earth as a magnet | Earths magnetic field extends outward from Earth for | null | null | Multiple Choice | a. a few kilometers., b. about 100 kilometers., c. about 330 kilometers., d. several thousand kilometers. | d |
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