Review Question Preview (ID: 19770)
Review For 7th Grade NC Common Exam.
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If Bob wants to build a water slide, what should he make it out of so that he travels the fastest?
a) sandpaper, because friction will be high
b) plastic, because friction will be low
c) carpet, because friction will be high
d) gravel, because friction will be low
If a magnet is placed near a pile of steel staples, which will most likely occur?
a) The magnet will provide a balanced force, causing the staples to spin in
b) The magnet will provide an unbalanced force, keeping the staples
c) The magnet will provide a balanced force, pushing the staples away from
d) The magnet will provide an unbalanced force, pulling the staples toward it
If a car is traveling at variable speed, what does that mean?
a) That the car is traveling at a constant speed of 65 mph.
b) That the car is traveling at a speed of 65 mph, then it slows down to 40 mph
c) That the car is traveling at a speed of 45 mph at exactly 4pm
d) That a car is stoping at a stop sign
If a ball is roling off a top shelf that is 4 meters off the ground, how could you describe its energy?
a) It has mechanical energy in the form of potential energy
b) Its energy will depend on the rate at which its position changes.
c) It has mechanical energy in the form of kinetic energy.
d) Its energy is lost once it starting falling off the shelf.
When a toy are is in motion and rolling down a hill, what happens to its energy?
a) Stored energy was transformed into energy of motion.
b) Energy of motion was transformed into chemical energy.
c) Stored energy in the ball applied a force to get the ball to move.
d) Internal energy caused the ball to move until the energy was gone.
As a race car travels down a hill, which type of change in energy allows it to speed up?
a) Kinetic energy changing into chemical energy
b) Kinetic energy changing into potential energy
c) Potential energy changing into chemicl energy
d) potential energy changing into kinetic energy.
Which form of energy does a person convert into mechanical energy?
a) thermal
b) chemical
c) wind
d) green
Plants change ____________ energy into chemical energy.
a) solar
b) nuclear
c) thermal
d) sound
How can a pulley make work easier?
a) by increasing the amount of friction necessary for the task
b) by decreasing the effort necessary to raise an object
c) by increasing the effort necessary to raise an object
d) by decreasing the efficiency of the task
Which simple machine would be the most efficient for loading something onto the back of a truck
a) pulley
b) screw
c) wedge
d) inclined plane
Why does air pressure decrease from the troposphere to the exosphere?
a) because there are fewer air molecules as altitude increases
b) because there are more air molecules as altitude increases
c) because there are higher temperatures as altitude increases
d) because there are lower temperatures as altitude increases
A high pressure system can cause...
a) tornadoes
b) hurricanes
c) large clouds as the air rises
d) calm weather as air sinks
How does the convection of air produce thunderstorms?
a) by causing warm air to sink and cold air to rise
b) by causing warm air to rise and cold air to sink
c) by causing both warm air and cold air to rise
d) by causing both warm air and cold air to sink
How does the Coriolis effect influence weather?
a) Winds turn to the right in the southern hemisphere
b) Winds turn to the right in the northern hemisphere
c) Winds will flow in a straight line about the Earth
d) Winds will rotate in a cirle around Earth causing a tornado
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