51. Cells are connected in parallel to
a. increase the voltage output
b. increase the internal resistance
c. decrease the current capacity
d. increase the current capacity
52. five carbon zinc cells in series have an output of
a. 1.5 V
b. 5.0 A
c. 7.5 V
d. 10.0 A
53. A constant voltage source has
a. low internal resistance
b. high internal resistance
c. minimum efficiency
d. minimum current capacity
54. Which of the following is false
a. A carbon zinc cell has unlimited shelf life
b. A lead acid cell can be recharged
c. A storage cell has an irreversible chemical reaction
d. A primary cell has an irreversible chemical reaction
55. The current in a chemical cell is a movement of
a. positive hole charges
b. positive ions only
c. negative ions only
d. positive and negative ions
56. Cells are connected in series to
a. increase the voltage output
b. decrease the voltage output
c. decrease the internal resistance
d. positive and negative ions
57. Which of the following is a dry storage cell?
a. mercury cell
b. nickel cadmium cell
c. carbon-zinc cell
d. edison cell
58. Two batteries having unequal emf
a. cannot be connected in parallel
b. cannot be connected in series
c. can be connected in series only
d. can be connected in parallel or series
59. Which of the following materials is used in solar cells?
a. silicon
b. barium
c. selenium
d. silver
60. The efficiency of a solar cell can be expected in the range
a. 10 to 15 percent
b. 25 to 35 percent
c. 45 to 60 percent
d. 70 to 85 percent
