Ques: Q: Elements are pure substances that make up what? Read this paragraph and choose the correct option from the provided answers: Elements are pure substances that make up all matter, so each one is given a unique name. The names of elements are also represented by unique one-, two-, or three- letter symbols. Choices: - some matter - Objects - Solids - all matter A:
Ans: all matter

Ques: Q: What structures of the cardiovascular system help regulate body processes by either constricting or dilating? Read this paragraph and choose the correct option from the provided answers: Blood vessels help regulate body processes by either constricting (becoming narrower) or dilating (becoming wider). These actions occur in response to signals from the autonomic nervous system or the endocrine system. Constriction occurs when the muscular walls of blood vessels contract. This reduces the amount of blood that can flow through the vessels (see Figure below ). Dilation occurs when the walls relax. This increases blood flows through the vessels. Choices: - muscles - cartilage - capillaries - blood vessels A:
Ans: blood vessels

Ques: Q: Which procedure helps modern nuclear physics convert lead into gold? Read this paragraph and choose the correct option from the provided answers: The alchemists were never successful in changing lead into gold. But modern nuclear physics can accomplish this task. Lead is subjected to nuclear bombardment in a particle accelerator. A small amount of gold can be obtained by this process. However, the cost of the procedure is far more than the amount of gold obtained. So the dream of the alchemists has never (and will never) come true. Choices: - nuclear fission - matter fusion - evaporation - nuclear bombardment A:
Ans: nuclear bombardment

Ques: Q: Geiger counters can be used to detect what, in general? Read this paragraph and choose the correct option from the provided answers: One reason radiation is dangerous is that it can't be detected with the senses. You normally can't see it, smell it, hear it, or feel it. Fortunately, there are devices such as Geiger counters that can detect radiation. A Geiger counter, like the one in Figure below , has a tube that contains atoms of a gas. If radiation enters the tube, it turns gas atoms to ions that carry electric current. The current causes the Geiger counter to click. The faster the clicks occur, the higher the level of radiation. You can see a video about the Geiger counter and how it was invented at the URL below. Choices: - seismic load - convection - evaporation - radiation A:
Ans:
radiation