Answer the following question given this paragraph: Steels are a very important class of alloys. The many types of steels are primarily composed of iron, with various amounts of the elements carbon, chromium, manganese, nickel, molybdenum, and boron. Steels are widely used in building construction because of their strength, hardness, and resistance to corrosion. Most large modern structures like skyscrapers and stadiums are supported by a steel skeleton (see Figure below ). Q: What is the primary component of steel alloys? Choices: - carbon - titanium - alluminum - iron A:
iron
(Question)
Answer the following question given this paragraph: Circle graphs are especially useful for showing percents of a whole. The circle graph in Figure below shows the percent of all vehicles counted that were of each type. Q: What type of graph is useful for showing percents of a whole? Choices: - shift graphs - gnomic graphs - bar graphs - circle graphs A:
(Answer)
circle graphs
Ques: Answer the following question given this paragraph: What if you were to drop a bowling ball and a soccer ball at the same time from the same distance above the ground? The bowling ball has greater mass than the basketball, so the pull of gravity on it is greater. Would it fall to the ground faster? No, the bowling ball and basketball would reach the ground at the same time. The reason? The more massive bowling ball is also harder to move because of its greater mass, so it ends up moving at the same acceleration as the soccer ball. This is true of all falling objects. They all accelerate at the same rate due to gravity, unless air resistance affects one object more than another. For example, a falling leaf is slowed down by air resistance more than a falling acorn because of the leaf's greater surface area. You can simulate the effect of air resistance on acceleration due to gravity by doing the interactive animation at this URL: http://www. science-animations. com/support-files/freefall. swf. Q: In the absence of air resistance, all falling objects accelerate at the same rate due to what force? Choices: - velocity - weight - motion - gravity A:
Ans: gravity
(Q).
Answer the following question given this paragraph: Avian Birds face special challenges when it comes to obtaining nutrition from food. They do not have teeth and so their digestive system, shown in Figure 34.7, must be able to process un-masticated food. Birds have evolved a variety of beak types that reflect the vast variety in their diet, ranging from seeds and insects to fruits and nuts. Because most birds fly, their metabolic rates are high in order to efficiently process food and keep their body weight low. The stomach of birds has two chambers: the proventriculus, where gastric juices are produced to digest the food before it enters the stomach, and the gizzard, where the food is stored, soaked, and mechanically ground. The undigested material forms food pellets that are sometimes regurgitated. Most of the chemical digestion and absorption happens in the intestine and the waste is excreted through the cloaca. Q: In which part of a bird stomach is food stored, soaked and mechanically ground? Choices: - pancreas - digestion - Gall bladder - gizzard A:
(A).
gizzard
Ques:Answer the following question given this paragraph: Avoid close contact with people who are sick. This includes kissing, hugging, shaking hands, and sharing cups or eating utensils. Q: What type of electrons are attracted to the positive nucleus? Choices: - turbulent electrons - particular electrons - passive electrons - negative electrons A:

Ans:negative electrons
Ques:Answer the following question given this paragraph: When current keeps reversing direction, it is called alternating current (AC) . You can see how it works in the two diagrams below. The current that comes from a power plant and supplies electricity to homes and businesses is alternating current. The current changes direction 60 times per second. It happens so quickly that the light bulb doesn't have a chance to stop glowing when the reversals occur. Q: What is it called when currents keep reversing direction? Choices: - circle current - emitting current - stream current - alternating current A:

Ans:
alternating current