OAE Middle Grades Science (029)

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OAE Middle Grades Science (029) Which of the following compounds is not allowed in a school laboratory because it is a potential carcinogen? A: lead B: benzene C: aspartame D: methanol - ✔✔B ... A laboratory experiment requires that red blood cells be separated from the serum in whole blood. Which of the following laboratory techniques would be most appropriate for this task? A: spectroscopy B: sublimation C: microscopy D: centrifugation - ✔✔D Which of the following quantities is the largest in the metric system of measurement? A: 10 decimeters B: 100 milligrams C: 100 grams D: 1 decagram - ✔✔C In an experiment on respiration, carbon dioxide production is measured over time. Placing the data in a chart is A: a visual representation of the data B: a conclusion based on the data C: the raw data D: a comparative analysis of the data - ✔✔A In order to be included in the formation of a scientific conclusion, evidence must be A: Quantitative B: Reproducible C: Obvious D: All of the above - ✔✔B A researcher is studying the response of bacteria to a certain chemical. In three experiments , the bacteria swim towards the chemical, and in one experiment the bacteria swim away from it. What would be the most appropriate next step for researchers? A: report only the first three experiments B: report all the experiments, but refrain from making any conclusions C: Repeat the experiment several more times and apply a statistical analysis to the data D: repeat the experiment , adding a new chemical to determine its effect on the bacteria - ✔✔C Which of the following biological discoveries was made first? A: Louis Pasteur discovered the causative role of the microorganisms in disease B: Charles Darwin discovered the principles of natural selection C: Gregor Mendel discovered that genes are basic units of inheritance D: Carl Von Linnaeus discovered that living things could be organized into binomial system of nomenclature - ✔✔D In a study investigating the causes of stomach ulcers, researchers observed that coffee drinkers had a higher incidence of stomach ulcers than those who didn't drink coffee. This is an example of A: a controlled experiment B: a cause and effect relationship C: correlation between two variables D: systematic error in sampling - ✔✔C Which of the following is an example of a renewable resource? A: trees B: ore minerals C: fossil fuels D: cash crops - ✔✔D Which of the following is NOT a significant factor in the dramatic increase of the human population over the past few hundred years? A: increased availability of habitable land B: scientific advances in agriculture C: improved sanitation D: an understanding of the causes of communicable diseases - ✔✔A Which of the following is a constant? A: the freezing point of water B: the temperature at which iron ore will melt C: human population size D: the time the sun rises each day - ✔✔A Which of the following is an example of a chemical reaction? A: heating ethanol so that it evaporates B: igniting ethanol so it burns C: dissolving salt in water D: making ice cubes in a freezer - ✔✔B Of the following, which is the most basic unit of matter? A: a helium atom B: a sodium atom C: a proton D: an oxygen molecule - ✔✔C Which of the following phenomena would most readily lend itself to mathematical modeling? A: the position of an electron in orbit around the nucleus of an atom B: the rate of blood flow through an artery C: the force required to extend a metal spring by a certain length D: the rate at which cells divide in an embryo - ✔✔C Without _____________ applied to it, an object in motion will tend to stay in motion. A: force B: inertia C: gravity D: acceleration - ✔✔A A car trip to a point 50 miles away from home and back takes four hours. The top speed of the car was 50 miles per hour, and this speed was maintained during the second and third hours of the trip. Which of the following values represents the average velocity of the car? A: 0 miles/ hour B: 12.5 miles/ hour C: 25 miles/ hour D: 50 miles/ hour - ✔✔A Which of the following properties of a meteorite moving through the planet's atmosphere would change as it approached the surface of the earth? A: its mass B: its volume C: its density D: its weight - ✔✔D Which of the following is NOT an example of one of Newton's laws of motion at work? A: Once in orbit, a satellite will continue moving around the earth B: It takes three times as much force to move a block across the floor C: A ball rolling across the floor will continue moving across the floor D: When a shotgun is fired, the gun moves sharply in the opposite direction of the bullet - ✔✔B Heating a liquid will most likely change its A: crystal structure B: Density C: Mass D: Electrical conductivity - ✔✔B Which of the following changes in physical properties is a chemical change? A: dissolving a seltzer tablet in water B: grinding pepper into powder C: freezing water D: churning cream into butter - ✔✔A Which of the following is a property of nonmetals? A: they are good conductors of e [Show More]

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