Your Result

• 1)

  In physics, “work” is defined as the displacement of an object due to the energy exerted on the object by a force. Which of the following would not be considered “work”:

  Your Answer : Not attemptedCorrect Answer : A magnet clinging to the side of a refrigerator

• 2)

  Energy can be classified as potential or kinetic. Objects with potential energy have stored energy based on their position or composition. Kinetic energy is present when an object is in motion. Potential energy becomes kinetic when a object is set into motion. Drag and drop each of the following examples under the type of energy they posses.

  

  Your Answer : c) A swinging baseball batCorrect Answer :

• 3)

  A biologist is working with park rangers to monitor the wolf population in a national park. As part of the monitoring program, they caught, microchipped, and released 12 wolves back into the park. The ranger estimates that there are about 48 wolves who have not yet been microchipped. What is the probability that any one wolf in the park has already been microchipped?

  Your Answer : Not attemptedCorrect Answer : 1/5

• 4)

  The acceleration (in meters per second squared) of an object is defined as the change in an object’s velocity (in meters per second) divided by the time over which the change occurs (in seconds). In other words,

  Find the acceleration of an object which had an initial velocity of 15 m/s , but increased its velocity to 35 m/s in 10 seconds.

  Your Answer : 2 m/s²Correct Answer : 2 m/s²

• 5)

  Matter most commonly exists in one of three states: solid, liquid, or gas. Solids have a fixed molecular structure and, thus, keep their form regardless of the container they are placed in. Liquids, although they do have a fixed volume, will change shape to fit the container they are placed in. Gases have the most
  variable molecular structure, and adjust both volume and shape to fit and fill a container. Substances, like water, can transition from one state of matter to another, most often due to a change in temperature.

  

  Based on the passage and diagram, when moisture in the air forms water
  droplets on the outside of a cold glass, this transition of states is known as:

  Your Answer : Not attemptedCorrect Answer : Condensation

• 6)

  Iron Oxide, or rust, is formed when iron (Fe) reacts with oxygen (O). Which of the following equations is most likely the balanced equation that describes this process?

  Your Answer : Not attemptedCorrect Answer :

  

• 7)

  A fish swims through the water by using its fins to push water backwards. Pushing water backwards propels the fish forward through the water. This most nearly fits which of Newton’s Laws?

  Your Answer : Not attemptedCorrect Answer : Newton’s Third Law which states that for every action, there is an equal and opposite reaction.

• 8)

  A science teacher wants to determine if access to technology affects IQ in American teenagers. He hypothesizes that students who spend a moderate amount of time (7-14 hours/week) using smartphones, tablets, and computers will perform better on an IQ test than both those with less technology usage and
  those with more technology usage. In order to test his hypothesis, the teacher conducts a survey of the students in his physics classes regarding the number of hours they spend using smartphones, tablets, and computers each week and administers IQ tests to each student. He analyzes the results by plotting the data on a scatter plot and concludes that his hypothesis was correct. How could the teacher have improved his experimental design in order to obtain more reliable results?

  Your Answer : Not attemptedCorrect Answer : Used a random sampling of teenagers rather than just his physics students.

• 9)

  At some level, virtually every organism, from the simplest to the most complex, gets its nourishment from the sun. Organisms that derive their nutritional requirements directly from the sun through the process of photosynthesis are classified as primary producers, as they generate the chemical energy used at all levels of the food chain. When other organisms consume the primary producers, a portion of this energy becomes available for the consumer’s use. At each level of the food chain, this cycle repeats; a lower level consumer falls prey to a higher level consumer, and passes on a portion of the energy that originated from photosynthesis. Refer to the food web below to determine which of the following organisms derives its nutritional requirements directly from the sun.

  

  Your Answer : Not attemptedCorrect Answer : Phytoplankton

• 10)

  It all starts with that first bite of pizza. Your teeth tear off that big piece of crust. Your saliva glands start spewing out spit like fountains. Your molars grind your pizza crust, pepperoni, and cheese into a big wet ball. Chemicals in your saliva start chemical reactions. Seemingly like magic, starch in your pizza crust begins to turn to sugar! A couple of more chews and, then, your tongue pushes the ball of chewed food to the back of your throat. A trap door opens, and there it goes, down your gullet!

  Your Digestive System. (2012). Discovery Kids. Retrieved October 9, 2013, from
  http://kids.discovery.com/tell-me/science/body-systems/your-digestive-system

  Drag and drop the following steps of the digestive process into the appropriate
  order according to the passage.

  

  Your Answer : Not attemptedCorrect Answer :

• 11)

  Cindy notices that daisies bloom in her neighborhood each year in mid-april as the weather begins warming up. She hypothesizes that daisies must grow faster in warm weather. To test her hypothesis, Cindy places 5 potted daisy seedlings in her refrigerator and maintains them at a constant temperature of 40 degree Farenheit. She places another 5 potted daisy seedlings on her windowsill to keep them at a constant temperature of 72 degree Farenheit. Cindy waters all ten seedlings the same amount every other day and measures their growth weekly.

  At the end of six weeks, Cindy compares the results of the two groups of daisies, using a table, pictured below. Cindy concludes that the data supports her hypothesis. Are Cindy’s experimental results valid?

  

  Your Answer : Not attemptedCorrect Answer : No, Cindy’s experiment had a flaw in the design since it did not control for extraneous variables, such as amount of light the plants receive, so her results are not valid.

• 12)

  Consider the below diagram

  

   

   

   

   

   

   

   

   

  According to the diagram, energy originates from the _______________ and is
  converted from a radiant from to a chemical form by the __________________.

   

  Your Answer : Not attemptedCorrect Answer : Sun, producers

• 13)

  The illustration below maps Earth’s “energy budget”. Overall, the amount of energy that enters earth’s system is equal to the amount of energy leaving the system, creating balance. According to the diagram, about what percent of incoming solar radiation is actually absorbed by the earth’s surface?

  

  Your Answer : Not attemptedCorrect Answer : 50%

• 14)

  In this experiment, three groups of the same type of plant were grown in identical circumstances. The only difference between the groups was an additive in the water. The researchers watered the first group of plants with a 2% coffee solution. They watered the second group with a 2% Miracle Grow solution. The
  third group had no additives in their water. The plants were then measured each month to see how tall they were in inches and the average height of each group was plotted on the graph.

  

  What hypothesis was most likely being tested in this experiment?

  Your Answer : Not attemptedCorrect Answer : Coffee is more effective than Miracle Grow in increasing plant growth.

• 15)

  In this experiment, three groups of the same type of plant were grown in identical circumstances. The only difference between the groups was an additive in the water. The researchers watered the first group of plants with a 2% coffee solution. They watered the second group with a 2% Miracle Grow solution. The
  third group had no additives in their water. The plants were then measured each month to see how tall they were in inches and the average height of each group was plotted on the graph.

  

  Drag and drop each selection below into the appropriate category in the table.

  

  Your Answer : Not attemptedCorrect Answer :

• 16)

  In this experiment, three groups of the same type of plant were grown in identical circumstances. The only difference between the groups was an additive in the water. The researchers watered the first group of plants with a 2% coffee solution. They watered the second group with a 2% Miracle Grow solution. The
  third group had no additives in their water. The plants were then measured each month to see how tall they were in inches and the average height of each group was plotted on the graph.

  

  If the hypothesis the researchers were testing was that coffee is a more effective additive than Miracle Grow for increasing plant growth, does the data support or refute the hypothesis?

  Your Answer : Not attemptedCorrect Answer : The data refutes the hypothesis. The plants watered with coffee showed less growth over the entire length of the experiment.

• 17)

  The diagram below represents the hierarchy of life, how multi-celled organisms are organized. As you move down the pyramid the structures become more and more complex. Use the diagram to determine which of the following choices is organized from least complex structure to most complex structure.

  

  Your Answer : Not attemptedCorrect Answer : Chondroblast cell, cartilage, human knee, skeletal system, human being

• 18)

  Each living thing on earth is part of a biome, a community of organisms and the habitat they inhabit. The major biomes are frequently classified by their annual precipitation and average temperature. Refer to the graph below to determine which of the following statements is probably true.

  

  Your Answer : Not attemptedCorrect Answer : The tundra is among the driest and coldest of any biome, typically seeing less than 100 cm of precipitation each year and maintaining an average temperature below freezing.

• 19)

  Read the following excerpt from Wikipedia:

  The water cycle involves the exchange of energy, which leads to temperature changes. For instance, when water evaporates, it takes up energy from its surroundings and cools the environment. When it condenses, it releases energy and warms the environment. These heat exchanges influence climate. The evaporative phase of the cycle purifies water which then replenishes the land with freshwater. The flow of liquid water and ice transports minerals across the globe. It is also involved in reshaping the geological features of the Earth, through processes including erosion and sedimentation. The water cycle is also essential for the maintenance of most life and ecosystems on the planet.

  The water cycle is responsible for:

  Your Answer : Not attemptedCorrect Answer : All of the above

• 20)

  The earth, in relation to its orbit around the sun, is tilted on its axis 23.5°. The resultant angle of the earth contributes to an interesting phenomenon, known as the four seasons. As the earth rotates around the sun each year, the hemisphere which is tilted more towards the sun will experience hotter temperatures,
  summer, and the hemisphere tilted away from the sun will experience cooler temperatures, winter. At the points in between, where neither hemisphere is angled more towards the sun, the hemispheres experience either spring or fall. The further away from the equator a region lies, the more drastically it will experience these seasonal changes.

  Refer to the passage and the diagram to determine which of the following is not
  true.

  

  Your Answer : Not attemptedCorrect Answer : When is it summer in the southern hemisphere, it is autumn in the northern hemisphere.

• 21)

  Read the following description from Wikipedia:

  An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer.

  Which of the following best describes an eclipse?

  Your Answer : Not attemptedCorrect Answer : When the moon passes between the sun and the Earth

• 22)

  Use the line graph below to predict the approximate world population in the year 2020.

  

  Your Answer : Not attemptedCorrect Answer : 7,000,000,000

• 23)

  Any object locked into orbit around a heavenly body is called a satellite. Satellites can be either natural or artificial and travel in a elliptical pattern around the larger body, trapped by its gravitational pull.

  Based on the passage, which of the following is true:

  Your Answer : Not attemptedCorrect Answer : The moon is a natural satellite orbiting earth.

• 24)

  Read the following passage from KidsGeo.com:

  Tides

  By far the most important factor affecting the movement of water across the ocean is the tides. Tides are great bulges of water caused by the gravity of the Moon and Sun. Attracted by gravity, these bulges move around the Earth’s oceans, causing water levels to rise and fall. Typically water will rise for about six hours, followed by six hours of falling water depths.

   

  

   

   

   

   

   

   

   

   

  Tides. (2013). Geography for kids, The study of our Earth. Retrieved October 17, 2013, from http://www.kidsgeo.com/geography-for-kids/0146-ocean-tides.php

  Tides are caused by:

  Your Answer : Not attemptedCorrect Answer : The pull of gravity

• 25)

  Read the following passage from KidsGeo.com regarding the Carbon Cycle:

  “…This important balance [of carbon] has been altered significantly in the past century as humans have begun using fossil fuels to produce energy. By burning the Earth’s store of carbon, mankind is able to create the energy needed to operate our communities. However, we must be careful as we do so. By releasing more carbon into the atmosphere than is being locked up, we risk causing damage to the delicate carbon cycle.”

  Passage Credit: The Carbon Cycle. (2013). Geography for kids, The study of our Earth. Retrieved
  October 17, 2013, from http://www.kidsgeo.com/geography-for-kids/0146-ocean-tides.php

  

  According to the passage, there is a risk of overloading the carbon cycle, and thereby contributing to global warming, by:

  Your Answer : Not attemptedCorrect Answer : Releasing more carbon into the atmosphere