Answer the following question given this paragraph: As you can see in Figure above , a transformer consists of two wire coils wrapped around an iron core. When alternating primary current passes through coil P, it magnetizes the iron core. Because the current is alternating, the magnetic field of the iron core keeps reversing. This changing magnetic field induces alternating current in coil S, which is part of another circuit. In Figure above , coil P and coil S have the same number of turns of wire. In this case, the voltages of the primary and secondary currents are the same. However, when the two coils have different numbers of turns, the voltage of the secondary current is different than the voltage of the primary current. Both cases are illustrated in Figure below . Q: When alternating primary current passes through coil p, it does what to the iron core? A:
OPTIONS:
- electrilizes it
- creates it
- heats it
- magnetizes it
magnetizes it
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Answer the following question given this paragraph: Types of chemical reactions include synthesis, decomposition, replacement, and combustion reactions. Q: Synthesis, decomposition, replacement, and combustion are all types of what reaction? A:
OPTIONS:
- natural
- toxic
- mineral
- chemical
chemical
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Answer the following question given this paragraph: Parasitic roundworms may have plant, vertebrate, or invertebrate hosts. Several species have human hosts. For example, hookworms, like the one in Figure below , are human parasites. They infect the human intestine. They are named for the hooks they use to grab onto the host's tissues. Hookworm larvae enter the host through the skin. They migrate to the intestine, where they mature into adults. Adults lay eggs, which pass out of the host in feces. Then the cycle repeats. Q: Through which organ do hookworm larvae enter the human body? A:
OPTIONS:
- through the lungs
- through the rectum
- through the mouth
- through the skin
through the skin
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Answer the following question given this paragraph: An amide can be formed by combining a carboxylic acid and an amine. Only primary and secondary amines can be used to form amides, since they have a hydrogen that can be replaced with the carbonyl carbon; tertiary amines will not form amides. The amide shown in the Figure above was formed from a carboxylic acid and a primary amine. Q: What can be combined with an amine to form an amide? A:
OPTIONS:
- carbon dioxide
- ketones
- acetic acid
- carboxylic acid
carboxylic acid
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