text stringlengths 47 621 |
|---|
Question: Why is some food dehydrated for astronauts to eat in space?
Answer: to preserve the food for extended flights |
Question: Perfume sprayed from a bottle spreads more easily in a warm room of 25°C than in a cool room of 15°C. Which of the following correctly compares perfume molecules at 25°C to those at 15°C?
Answer: At 25°C, they are moving faster. |
Question: Which of the following is believed to be one cause of global warming?
Answer: atmospheric rise of carbon dioxide |
Question: What product was being formed as plants died and sank to the bottom of swamps?
Answer: coal |
Question: What is the approximate length of time it takes the Moon to complete one lunar cycle?
Answer: 29 days |
Question: A line graph is best used when the measured variable is
Answer: changing at a constant rate. |
Question: All living things need energy to survive. What is the primary source of energy for all living things?
Answer: the sun |
Question: If a chemical reaction such as photosynthesis begins with 6 atoms of carbon [C], how many atoms of carbon [C] should be in the products?
Answer: 6 atoms of carbon [C] |
Question: Which object refracts light?
Answer: glass prism |
Question: A gastroenterologist is a doctor who treats problems of the esophagus, stomach, and intestines. Which organ system is cared for by this type of doctor?
Answer: digestive system |
Question: Which event becomes more likely during a drought in a prairie ecosystem?
Answer: fire |
Question: When scientists publish papers describing the results and conclusions of their experiments, members of the scientific community should
Answer: evaluate the evidence in the paper. |
Question: Kim lost her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?
Answer: chemical |
Question: Which human activity has most negatively affected air quality?
Answer: burning coal |
Question: Most of the bacteria in a forest ecosystem are best classified as which of the following types of organisms?
Answer: decomposers |
Question: A pencil falls off of a desk. What moves the pencil toward the floor?
Answer: gravity |
Question: All of the processes listed below cause changes in Earth's surface. Which of the following is the slowest to change Earth's surface?
Answer: weathering |
Question: A group of students was preparing an activity to determine whether certain materials will float or sink when placed on water. Before the experiment started, one student said, "I think the sponge will float." This statement was
Answer: a prediction |
Question: What tool is used to determine the mass of an object?
Answer: Balance |
Question: According to the Periodic Table of the Elements, mercury (Hg) is different from other metals because mercury is
Answer: liquid at room temperature. |
Question: When using more than the recommended amounts of pesticide on farmland, yards, and gardens, what is most likely to occur?
Answer: Water supplies can be contaminated by pesticide runoff. |
Question: According to the fossil record, when did episodes of rapid speciation commonly take place?
Answer: following mass extinctions |
Question: A deer inherits some of its features from its parents. Other features come from its environment. Which feature would a deer most likely inherit from its parents?
Answer: brown eyes |
Question: What is the smallest structural and functional unit of the nervous system?
Answer: neuron |
Question: Male peacocks have large brightly colored tail feathers. What is the most likely reason for this?
Answer: to attract potential mates |
Question: In a city, the daily high and low 16 temperatures for a month are best represented by which of the following?
Answer: line graph |
Question: Drew was measuring the growth of a vine that can grow almost 31 cm a day. Which would be the best way to record his data of the growth over a period of a day?
Answer: a line graph |
Question: All of the following are functions of a cell membrane except
Answer: producing energy for cell processes. |
Question: Which characteristic will a baby chimpanzee inherit from its parents?
Answer: fur color |
Question: Which object is the best conductor of electricity?
Answer: an iron nail |
Question: Why are some rocks smoother and rounder than others?
Answer: They were smoothed by the action of wind and water. |
Question: A vaccine can prevent a serious disease. When a new vaccine is developed, it is given to a small group of people. Why would it be important to test each vaccine on a small group of people before everyone can have one?
Answer: to determine how the vaccine will affect people |
Question: When can producers make the most food?
Answer: summer, because there is more sunlight |
Question: Plants have special tissues that transport food, water, and minerals throughout the plant. What are these tissues similar to in animals?
Answer: arteries and veins |
Question: Which of the following statements best explains how the decomposition of plant and animal matter helps to form rich soils?
Answer: Decomposition adds nutrients to soil. |
Question: Beans and coal both have stored energy. Where did the energy come from that is stored in beans and coal?
Answer: From the Sun's light |
Question: A metal ball has a constant velocity of zero. Which other quantity must also be zero?
Answer: acceleration of the ball |
Question: What geographic obstacle causes water to condense in an air mass as the air mass moves?
Answer: mountains |
Question: If an object is attracted to a magnet, the object is most likely made of
Answer: metal |
Question: Which explains the pattern of day and night?
Answer: Earth spins on its axis. |
Question: Which is the best plan to make the fossil fuel supply last longer?
Answer: reduce electricity use |
Question: The stages of evolution of a star are determined by the mass of the star at the beginning of its life cycle. Which stage of evolution is the oldest form of a massive star?
Answer: neutron star |
Question: Which of these best indicates that sediments can be changed into rock?
Answer: layers of sandstone |
Question: Carbon cycles through several Earth subsystems. Which sequence most directly leads to the cycling of carbon that can result in the formation of petroleum?
Answer: biosphere to lithosphere |
Question: Which word best describes the speed of a cart that has a positive velocity and a negative acceleration?
Answer: decreasing |
Question: A hurricane is a heat engine which converts one kind of energy into another. Hurricanes convert most of the heat energy into
Answer: mechanical energy. |
Question: Which of the following is a crucial piece of evidence supporting scientists' theory of how the continents and the ocean basins formed?
Answer: Currents redistribute heat in an unevenly heated liquid. |
Question: What motion causes day and night?
Answer: rotation of Earth |
Question: The axis of Earth is tilted at an angle of 23.5° from the vertical position. Which of the following is the main result of this tilt?
Answer: change of seasons |
Question: In an earthquake, the primary waves move through
Answer: rock |
Question: Which of the following is the major cause of tides?
Answer: gravitational pull of the Moon |
Question: A dog opens its mouth and lets its tongue hang out. A human's body produces sweat. These are two ways that organisms may adjust to
Answer: hot temperatures |
Question: Fires in forests from lightning rid the forest of dead branches and leaves. If the trees survive and the soil remains intact, the forest will experience regrowth to its climax state by which process?
Answer: succession |
Question: A class planted trees and shrubs in an empty dirt lot beside the school. The roots of the plants can help protect the soil. The soil is most likely being protected from what?
Answer: wind erosion |
Question: In the process of photosynthesis, sunlight is converted into
Answer: chemical energy. |
Question: Vascular plants have tissue called xylem. Which of these is transported by the xylem?
Answer: water needed by the plant |
Question: If Lisa wants to experiment with bean plants, which of these is the best example of a hypothesis?
Answer: Fertilizer will make bean plants grow taller. |
Question: A jeweler melts gold to make jewelry. As the gold melts, the mass
Answer: stays the same. |
Question: Which of the following tools is most useful for tightening a small mechanical fastener?
Answer: pliers |
Question: Oil, coal, and natural gas are fossil fuels formed under what conditions?
Answer: high temperature and high pressure |
Question: Some birds build nests in the spring. This nest building is a seasonal adaptation that occurs to help the birds
Answer: protect their young |
Question: Which tool is used to measure the volume of a liquid?
Answer: graduated cylinder |
Question: The functions of a plant's roots are to support the plant and
Answer: take in water and nutrients |
Question: All of the inherited traits that are passed to offspring during asexual reproduction come from a single
Answer: parent. |
Question: What energy transformation occurs when an electric lamp is turned on?
Answer: electrical energy to light and heat energy |
Question: Which phase change in the atmosphere forms clouds?
Answer: condensation |
Question: Where are the most reactive nonmetals located on the periodic table?
Answer: the second column from the right side of the table |
Question: Who was a leading authority on continental drift in the early 1900s?
Answer: Alfred Wegener |
Question: In addition to oxygen, which gases make up the largest percentage of Earth's atmosphere?
Answer: carbon dioxide, water vapor, and nitrogen |
Question: For many years, people have been curious about the stars. In the past, people have shared what they knew about the stars through stories and drawings. Which pair of tools would be most helpful for people today to gather and share information about stars?
Answer: a telescope and a computer |
Question: During a presentation on astronomy, Professor Williams discussed various measurements in space. Which objects was she referring to when she talked about how astronomical units (AU) were determined?
Answer: the Sun and Earth |
Question: As more people have moved to the beach, the sea turtle population has decreased. Which is most likely the cause of this decrease?
Answer: habitat loss |
Question: The skin of a chameleon can change colors to help it blend with its surroundings. How would this adaptation most likely help a chameleon survive?
Answer: by helping the chameleon hide from its predators |
Question: A student examines a new watch design. The watch has a small solar cell on its face. The main function of the solar cell is to
Answer: provide an energy source for the watch. |
Question: The presence of which of the following geological features provides the best evidence that glaciers once covered an area?
Answer: U-shaped valleys |
Question: Which of these is a way the people of Virginia can help restore a natural ecosystem?
Answer: Plant native plants |
Question: A student wants to figure out how many calories are needed to perform various activities. A list of some everyday activities is made, and the number of calories burned during each activity is recorded. Which method is the best way for the student to display and evaluate the information?
Answer: create a table |
Question: Sedimentary deposits formed from organic material tend to include a high amount of
Answer: carbon. |
Question: According to the Big Bang Theory, which element most likely formed first?
Answer: hydrogen |
Question: Tim and Carla play catch with a ball. Which term describes the motion of a ball?
Answer: speed |
Question: Which set of equipment would be best to use when investigating what is found in a sample of pond water?
Answer: microscope, eye dropper, slides |
Question: The Theory of Plate Tectonics revolutionized scientific thought because it
Answer: explained the movement of oceanic and continental crusts. |
Question: How does repeating an experiment improve the likelihood of obtaining accurate results?
Answer: Data can be compared. |
Question: One hundred grams of water and 100 grams of vegetable oil are heated in identical containers at 70°C for 5 minutes. Their temperatures at the end of 5 minutes are different due to the difference in which property?
Answer: specific heat |
Question: There are MORE hours of sunlight in the Northern Hemisphere during which season?
Answer: summer |
Question: Which force produces energy as heat?
Answer: friction |
Question: Biologists have discovered that the beluga whales of Canada's St. Lawrence River have the highest rates of cancer among animals. What is most likely the reason for this high incidence of cancer in these whales?
Answer: chemical and pollutant runoff into the ocean |
Question: Reading from left to right, elements in the same period on the Periodic Table of the Elements
Answer: increase in atomic number. |
Question: A device that converts light energy into electricity used in many handheld calculators is a
Answer: photovoltaic cell. |
Question: Which most accurately describes a circle (pie) graph?
Answer: used to describe how part of the data relates to all of the data |
Question: Which organisms benefit in the relationship between bees and flowering plants?
Answer: both the bees and the flowering plants |
Question: The orbit of Earth is almost circular and has a period of about 365 days. Compared to the orbit of Earth, which of these objects usually have highly elliptical orbits and can have periods of over 1000 years?
Answer: comets |
Question: How is the theory of plate tectonics different from a hypothesis regarding a certain aspect of plate movement?
Answer: The theory explains a number of related observations. |
Question: A large quantity of heavy rain falling in a short time period will most likely
Answer: reduce the amount of nutrients in the soil. |
Question: An artificial pacemaker is a device that regulates the beat of the heart by an electrical stimulus. Some early pacemakers were powered by batteries and were worn externally with wires passing through the skin to the surface of the heart. Modern pacemakers are now much smaller and are implanted surgically. Which most likely has increased the lifespan and effectiveness of artificial pacemakers?
Answer: the invention of lithium batteries |
Question: A balloon filled with helium gas is set free and starts to move upward. Which of the following best explains why the helium balloon moves upward?
Answer: The density of helium is less than the density of air. |
Question: Oscar and Andre used a microscope to observe a sample of pond water and drew an example of each type of organism they saw. Then they compared their drawings. They discovered that their drawings of a euglena and a paramecium were alike, but their amoeba drawings had very different shapes. What are two things that Oscar's amoeba could have been doing that made his drawing look different from Andre's?
Answer: eating and moving |
Question: The reading on a barometer rises when the air
Answer: pressure increases. |
Question: Which of the following processes is responsible for changing liquid water into water vapor?
Answer: evaporation |
Question: In an atom, protons plus neutrons make up the atom's
Answer: atomic mass. |
Subsets and Splits
No community queries yet
The top public SQL queries from the community will appear here once available.