Question

Question 139

Why might the relative amount of deuterium (a heavier isotope of hydrogen) help to determine temperature?

A.Because it is heavier it would take more energy to excite and evaporate.

B.It indicates that there is more radiation because it has picked up an extra neutron.

C.It would fall out of the sky more readily when it is colder because it has a higher density.

D.It does not fragment as readily in the presence of UV and so more indicates more UV radiation.

E.None of these

Question 140

The surface of the moon is 200°C during the day but -270°C during the night. Why?

A.There is nothing to reflect the radiation absorbed by the ground, so it all escapes into space.

B.The moon soil has a lower heat capacity than the earth's soil.

C.There is a temperature inversion taking place.

D.All of these

E.None of these

Question 141

What is one drawback of dams?

A.They prevent fish from spawning.

B.They soften the shells on avian eggs.

C.Because they are pollution free, the electricity is more expensive.

D.All of these

E.None of these

Question 142

What are some major advantages of using seawater to produce hydrogen from electrolysis?

A.Seawater is abundant.

B.Seawater contains ions.

C.Hydrogen plants can be located where they won't take up valuable land.

D.All of these

Question 143

Why are countries teaming up to develop nuclear fusion energy?

A.so that no one country will have total control over fusion technology

B.to pool financial and intellectual resources

C.to beat the clock before fossil fuels run out

D.All of these

Answer 1

139) Answer : C.It would fall out of the sky more readily when it is colder because it has a higher density.

140) Answer : D) all of these

141) B.They soften the shells on avian eggs.

142) B.Seawater contains ions.

143) D.All of these