Question

Question 24(Multiple Choice Worth 2 points)
An environmental group wants to sink a ship off the coast to create an artificial reef. They find that they must get a permit from the Environmental Protection Agency in order to be allowed to do this. Which statement best describes why a permit would be required.
A.The environmental protection agency does not trust the environmentalists. B.The environmental protection agency is trying to make money by selling the permits.
C.The environmental protection agency needs to inspect the ship and make sure it is safe before giving the ok.
D.The environmental protection agency uses permits to control the actions and beliefs of some environmental groups.
(I put A)
Question 25(Multiple Choice Worth 2 points)
What is gravity? Gravity is the force
A.of attraction between two objects; it is not related to the object's mass.
B.of attraction between two objects; it is related to the object's mass.
C.that acts on objects when they are pushed
D.that repels objects that have like charges
(I put B)
Question 26(Multiple Choice Worth 2 points)
There is an increase in the amount of work completed; all other factors have remained the same. As a result, the amount of power will
A.decrease.
B.decrease, then increase.
C.increase.
D.remain the same.
(I put B)
Question 27(Multiple Choice Worth 2 points)
Which statement correctly describes the relationship between power, voltage, and current?
A.If voltage is increased, and no other changes are made, power will decrease. B.If voltage is increased, and no other changes are made, power will increase. C.If current is decreased, and no other changes are made, power will increase. D.In order to decrease power, voltage must be decreased.
(I put B)
Question 28(Multiple Choice Worth 2 points)
The hybrid car uses battery power and gasoline to power the vehicle. This means that less gasoline is burned to power the vehicle. When burned, gasoline emits pollutants into the air. Evaluate the statements and choose the statement that best describes how this technology benefits the environment.
A.Electricity is cheaper than gas; hybrid cars use more electricity generated by the battery they carry. Therefore, hybrid cars will save people money in fuel costs.
B.Gasoline is a nonrenewable resource that, when burned, produces pollution that can harm the environment; therefore, because hybrid cars emit less pollution than regular cars, they do not cause as much damage to the environment. C.Hybrid cars are becoming more popular all the time. This means that sales of hybrid cars are going up. When sales go up, this creates jobs for people in our country and beyond.
D.Hybrid cars run totally on a renewable resource. This means that as these cars become more popular, we will decrease our dependence on oil. Using less oil will reduce the amount of certain pollutants in the environment.
(I put B)

Answer 1

Question 24.
The Environmental Protection Agency is a regulatory agency that protects human and environmental life. Because it is a regulatory agency, it oversees all actions that has a direct effect on the environment. Letter A could be an answer, but not the best. The EPA does not trust environmentalists because they still have to inspect the ship. Maybe the ship would drive away fishes from their aquatic homes which would cause an imbalance in the ecosystem. So, the best answer would be letter C.

Question 25:
Gravity is a force of attraction that acts as the pull towards the object's center. According to Newton's Law of Universal Gravitation, the force of gravity is directly proportional to the mass, and inversely proportional to distance. The heavier and nearer the objects are, the greater the force of gravity. Every object in the world is acted upon by gravity, whether at rest or moving. Therefore, the answer is B.

Question 26:
Power is the amount of work done per unit time. So, if time is not changed and work increases, the power will have to increase as well. The answer is C.

Question 27:
In electricity, the power of the load in a circuit is equal to the product of its voltage and current. Therefore, voltage and current are directly proportional to power. But they are inversely proportional to each other. So, if voltage increases, the power also increases. Therefore, the answer is B.

Question 28:
Hybrid cars work on the energy both coming from oil and electricity. Electricity is a more expensive fuel than oil. So, you will expect that hybrid cars are much more expensive. Electricity comes from batteries, which is made up of electrolyte solutions of metals. They are non-renewable source as well. The only advantage is that, batteries do not emit pollutant gases unlike oil. These gases deteriorate the ozone layer which protects the Earth from exposure to UV rays. Therefore, the answer is B.