1) Which one of the following is the most correct statement about fuel cells and secondary cells?
A. Fuel cells can be recharged like secondary cells.
B. Fuel cells produce thermal energy, whereas secondary cells do not produce thermal energy.
C. The anode in a fuel cell is positive, whereas the anode in a secondary cell is negative.
D. Fuel cells deliver a constant voltage during their operation, whereas secondary cells reduce in voltage as they
discharge.
Solution
2) Hydrogen, H2 , fuel cells and H2 -powered combustion engines can both be used to power cars. Three statements about
H2 fuel cells and H2 -powered combustion engines are given below:
I Neither H2
fuel cells nor H2 -powered combustion engines produce greenhouse gases.
II Less H2 is required per kilometre travelled when using an H2 -powered combustion engine than when using
H2 fuel cells.
III More heat per kilogram of H2 is generated in an H2 -powered combustion engine than in H2 fuel cells.
Which of the statements above are correct?
A. II only
B. I and II only
C. III only
D. I and III only
Solution
