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Test Description: Review for 7th grade NC Common Exam
Instructions: Answer all questions to get your test result.
1) If Bob wants to build a water slide, what should he make it out of so that he travels the fastest?
A
gravel, because friction will be low
B
sandpaper, because friction will be high
C
plastic, because friction will be low
D
carpet, because friction will be high
2) 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 an unbalanced force, pulling the staples toward it
D
The magnet will provide a balanced force, pushing the staples away from
3) If a car is traveling at variable speed, what does that mean?
A
That a car is stoping at a stop sign
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 constant speed of 65 mph.
D
That the car is traveling at a speed of 45 mph at exactly 4pm
4) 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
Its energy is lost once it starting falling off the shelf.
D
It has mechanical energy in the form of kinetic energy.
5) When a toy are is in motion and rolling down a hill, what happens to its energy?
A
Stored energy in the ball applied a force to get the ball to move.
B
Internal energy caused the ball to move until the energy was gone.
C
Energy of motion was transformed into chemical energy.
D
Stored energy was transformed into energy of motion.
6) As a race car travels down a hill, which type of change in energy allows it to speed up?
A
potential energy changing into kinetic energy.
B
Kinetic energy changing into potential energy
C
Kinetic energy changing into chemical energy
D
Potential energy changing into chemicl energy
7) Which form of energy does a person convert into mechanical energy?
A
wind
B
green
C
chemical
D
thermal
8) Plants change ____________ energy into chemical energy.
A
thermal
B
nuclear
C
solar
D
sound
9) 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 decreasing the efficiency of the task
D
by increasing the effort necessary to raise an object
10) Which simple machine would be the most efficient for loading something onto the back of a truck
A
pulley
B
inclined plane
C
screw
D
wedge
11) Why does air pressure decrease from the troposphere to the exosphere?
A
because there are lower temperatures 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 fewer air molecules as altitude increases
12) A high pressure system can cause...
A
calm weather as air sinks
B
large clouds as the air rises
C
hurricanes
D
tornadoes
13) How does the convection of air produce thunderstorms?
A
by causing both warm air and cold air to rise
B
by causing warm air to sink and cold air to rise
C
by causing both warm air and cold air to sink
D
by causing warm air to rise and cold air to sink
14) How does the Coriolis effect influence weather?
A
Winds will flow in a straight line about the Earth
B
Winds turn to the right in the northern hemisphere
C
Winds turn to the right in the southern hemisphere
D
Winds will rotate in a cirle around Earth causing a tornado
*select an answer for all questions
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