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Nature of Science
Earth Science
Biology
Physical Science
100
A student wants to perform an experiment to test how much water bean plants need for good growth. Which factor should be changed?
A The temperature
B The amount of light
C The amount of water
D The amount of soil
C. The amount of water
100
What type of rock is formed in layers?
A Sedimentary
B Igneous
C Granite
D Obsidian
A Sedimentary
100
In a food chain, which are the most efficient users of solar energy? A Herbivores
B Carnivores
C Omnivores
D Parasites
A Herbivores
100
Which of these cannot be separated into a simpler substance?
A Element
B Compound
C Homogeneous Mixture
D Heterogeneous Mixture
A Element
200
New studies on a drug that regulates blood pressure show that it can cause harmful side effects if used for many years. What should the manufacturer do?
A Destroy the new results.
B Ignore the new studies because all drugs have harmful long-term side effects.
C Market the drug under a new name to avoid bad publicity.
D Inform the public and remove the drug from the market immediately.
D Inform the public and remove the drug from the market immediately.
200
Chris notices his shadow's length changes during the day. At what time is it shortest?
A 8 AM
B 12 PM
C 3 PM
D 6 PM
B 12 PM
200
An amoeba divides into two identical daughter cells. They have exactly the same characteristics as the parent amoeba. Which best describes the amoeba’s division?
A Diffusion
B Meiosis
C Mitosis
D Osmosis
C Mitosis
200
What property of light waves can be observed as light waves pass from one medium to another and change speed?
A Diffraction
B Refraction
C Reflection
D Separation
B Refraction
300
When modern disease-controlling medicines and practices are introduced in developing countries, the first major change is that —
A life spans increase
B birthrates decrease
C the population decreases
D the water supply increases
A life spans increase
300
Wind occurs when air masses move from one place to another. What causes the movement of air masses?
A The position of the moon
B The rotation of Earth
C The heating of the air
D The condensation of air
C the heating of the air
300
Which structure performs photosynthesis?
A Chromosome B Chloroplast C Cell wall D Cell membrane
B Chloroplast
300
Most of the chemical energy of the gasoline burned in a car is not used to move the car but is changed into — A electricity
B sound
C magnetism
D heat
D heat
400
After a recent experiment, a scientist noticed that the computer simulation varied from the actual experiment. What should the scientist do?
A Repeat the experiment several times in order to verify the results.
B Adjust the computer’s program so it matches the actual results.
C Ignore the actual results as inaccurate because computers are very precise.
D Ignore the simulation as inaccurate because of a possible computer virus.
A Repeat the experiment several times in order to verify the results.
400
In Illinois, the constellation Orion can be seen in the night sky in winter. Why can this constellation not be seen in the summer?
A Earth is tilted away from the constellation.
B Earth orbits to the other side of the sun.
C Brighter constellations block Orion from view in the Northern Hemisphere.
D The orbit of the moon blocks
Orion from view in the Northern Hemisphere.
B Earth orbits to the other side of the sun.
400
Why does a gamete produced during meiosis have half as many chromosomes as a daughter cell produced during mitosis?
A Meiosis does not involve a step in which the original cell makes a copy of its chromosomes.
B Meiosis involves a second cell division that separates identical chromosomes.
C Mitosis does not involve a step in which the original cell makes a copy of its chromosomes.
D Mitosis involves a second cell division that separates identical chromosomes.
D Mitosis involves a second cell division that separates identical chromosomes.
400
The energy stored in fossil fuels such as propane gas and coal are stored as
A kinetic energy
B heat energy
C mechanical energy
D chemical energy
D chemical energy
500
Some scientists are concerned that television, radio, and newspapers report the outcome of experiments too quickly. What would be the major scientific concern?
A Conclusions may be drawn by the public before the results are verified by other laboratories.
B Other agencies may hear of the experiments and claim credit for them.
C Commercial organizations may copy the ideas and sell them for profit.
D The level of scientific research is lowered to a media event.
A Conclusions may be drawn by the public before the results are verified by other laboratories.
500
Why does weather tend to move eastward across the central United States?
A Warmer air from the West Coast tends to spread out toward cooler air over the East Coast.
B Air moves from higher air pressure over the Pacific Ocean to lower air pressure over the Atlantic Ocean.
C Global winds blow generally from west to east in the middle latitudes.
D Mountain breezes blow from the western mountains across the country.
C Global winds blow generally from west to east in the middle latitudes.
500
Which of the following is an example of natural selection?
A A saltwater species will adapt to a lake that slowly changes to freshwater over thousands of years
B A deer with larger antlers is more likely to be hunted
C A wolf without food is more likely to change its habitat
D An armadillo with thicker armor is more likely to survive and reproduce
D An armadillo with thicker armor is more likely to survive and reproduce
500
Which of the following best explains why water is a liquid at room temperature but gold is a solid?
A Gold has less conductivity than water
B Gold molecules have more mass than water molecules, so it takes more energy to put the molecules in motion
C Water molecules are held together more tightly than gold molecules
D Water has a lower specific heat than gold
B Gold molecules have more mass than water molecules, so it takes more energy to put the molecules in motion