Q: Inserting an extra plane of atoms into a crystal lattice produces what?   Read this paragraph and choose the correct option from the provided answers:  Dislocations, Deformations, and Work Hardening Inserting an extra plane of atoms into a crystal lattice produces an edge dislocation. A familiar example of an edge dislocation occurs when an ear of corn contains an extra row of kernels between the other rows (). An edge dislocation in a crystal causes the planes of atoms in the lattice to deform where the extra plane of atoms begins (). The edge dislocation frequently determines whether the entire solid will deform and fail under stress. Deformation occurs when a dislocation moves through a crystal. To illustrate the process, suppose you have a heavy rug that is lying a few inches off-center on a nonskid pad. To move the rug to its proper place, you could pick up one end and pull it. Because of the large area of contact between the rug and the pad, however, they will probably move as a unit. Alternatively, you could pick up the rug and try to set it back down exactly where you want it, but that requires a great deal of effort (and probably at least one extra person). An easier solution is to create a small wrinkle at one end of the rug (an edge dislocation) and gradually push the wrinkle across, resulting in a net movement of the rug as a whole (part (a) in ). Moving the wrinkle requires only a small amount of energy because only a small part of the rug is actually moving at any one time. Similarly, in a solid, the contacts between layers are broken in only one place at a time, which facilitates the deformation process. Saylor URL: http://www. saylor. org/books.   Choices:  - spot location  - spot dislocation  - edge location  - edge dislocation   A:
edge dislocation
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Q: Red bone marrow, tonsils, spleen, and thymus gland are considered organs of what system?   Read this paragraph and choose the correct option from the provided answers:  The lymph organs are the red bone marrow , tonsils , spleen , and thymus gland . They are described below ( Figure below ).   Choices:  - endocrine  - nervous  - circulatory  - lymphatic   A:
lymphatic
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Q: Visible light is one type of this radiation?   Read this paragraph and choose the correct option from the provided answers:  Visible light is one type of electromagnetic radiation , which is a form of energy that exhibits wavelike behavior as it moves through space. Other types of electromagnetic radiation include gamma rays, x-rays, ultraviolet light, infrared light, microwaves, and radio waves. The figure below shows the electromagnetic spectrum , which is all forms of electromagnetic radiation. Notice that visible light makes up only a very, very small portion of the entire electromagnetic spectrum. All electromagnetic radiation moves through a vacuum at a constant speed of 2.998 × 10 8 m/s. While the presence of air molecules slows the speed of light by a very small amount, we will use the value of 3.00 × 10 8 m/s as the speed of light in air.   Choices:  - neutron  - Ionizing  - Gamma  - electromagnetic   A:
electromagnetic
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Q: What two basic types of feather does a bird have?   Read this paragraph and choose the correct option from the provided answers:  Feathers help birds fly and also provide insulation and serve other purposes. Birds actually have two basic types of feathers: flight feathers and down feathers. Both are shown in Figure below . Flight feathers are long, stiff and waterproof. They provide lift and air resistance without adding weight. Down feathers are short and fluffy. They trap air next to a bird’s skin for insulation.   Choices:  - carrying and down  - up and down  - flight and landing  - flight and down   A:

flight and down
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