BMK I Review

Ethanol, often produced from corn, is being added to gasoline in an attempt to reduce the     amount of fossil fuel usage.  Which is an unintended negative consequence of ethanol use?

• conserving fossil fuels 
• improvement in gas mileage
• cost of corn products increase
• improved health of environment

An engineering company is testing a new weather-forecasting program.  Which procedure would best verify that the program is making accurate predictions?

• comparing the predictions of the program to the actual weather
• comparing the predictions of the program to other predictions
• using the program to verify events not related to weather
• using the progam to verify past weather-related events

A company is designing a dam with a floodgate to keep houses safe during the rainy season.  The company is reviewing several possible designs that have worked in the past and is trying to develop a plan for implementing one design.  What is the next step in this process?

• pick several dams for the homeowners to choose from
• test each dam model during a different flood season
• analyze the dam designs and pick one based on local needs
• redesign the past dams on what the company wants to spend for the dam

A bridge that crosses a small river was damaged by a flood. After engineers repair the bridge, which engineering procedure should be performed next?

• test the strength of the bridge
• measure the width of the river
• build a small-scale model of the bridge
• identify how fast the water in the river travels

Which of the following is a negative unintended consequence of the automobile?

• It causes traffic congestion.
• It transports people to see family and friends.
• It gives people an alternative way to get to work.
• It creates jobs for people when automobiles need repair and maintenance.

A student rapidly rubs the palms of both hands together. Which sequence correctly describes the energy transformations that occur?

• chemical to mechanical to heat
• mechanical to nuclear to heat
• heat to mechanical to chemical
• mechanical to heat to chemical

Maria made the following chart.

Which of these shows the correct placement for the examples in the numbered columns of the chart?  

• 1-Car at top of hill
  2-Stretchy hair band
  3-Matches
• 1-Stretchy hair band
  2-matches
  3-Car at the top of the hill
• 1-Stretchy hair band
  2-Car at the top of the hill
  3-Matches
• 1-Matches
  2-Car at the top of the hill
  3-Stretchy hair band

Which statement best describes the energy changes that occur while a child is riding on a sled down a steep, snow-covered hill?

• Kinetic energy decreases and potential energy increases.
• Kinetic energy increases and potential energy decreases.
• Both potential energy and kinetic energy decrease. 
• Both potential energy and kinetic energy increase.

A student is investigating potential and kinetic energy by stretching a spring across a table. When the student lets go, the spring recoils.
At which time is potential energy in the spring being converted into kinetic energy in this system?

• when the spring is stretching
• when the spring is fully stretched
• when the spring is recoiling (released)
• when the spring is fully recoiled

Which of the following are examples of elastic potential energy?

• slinky, hot dog, pogo stick
• trampoline, bungee cord, rubber band
• high dive, bird’s nest in a tree, springs
• rock on a cliff, fireworks display, clock ticking