Which of the following statements correctly describes the law of conservation of energy?
A) Energy can change between many different forms, such as potential, kinetic, and thermal, but it is ultimately destroyed.
B) An object always has the same amount of energy.
C) The fact that you can fuse hydrogen into helium to produce energy means that helium can be turned into hydrogen to produce energy.
D) The total quantity of energy in the universe never changes.
E) It is not really possible for an object to gain or lose potential energy because energy cannot be destroyed.
Question 2How long does it take our solar system to complete one orbit around the Milky Way Galaxy?
A) 100 million years
B) 1 million years
C) 230 thousand years
D) 10 thousand years
E) 230 million years
Question 3What are the circumstances under which convection can occur in a substance?
A) when the substance is subjected to a strong magnetic field
B) when the substance is strongly cooled from underneath
C) when dense material is being added to the substance
D) when the substance is strongly shaken or disturbed by a strong wind
E) when the substance is strongly heated from underneath
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