A student examines a new watch design. The watch has a small solar cell on its face. The main function of the solar cell is to
A B C D
reduce the cost of the watch. provide an energy source for the watch. make the watch more attractive. stop the watch from speeding up.
Question: A student examines a new watch design. The watch has a small solar cell on its face. The main function of the solar cell is to
(A) reduce the cost of the watch.
(B) provide an energy source for the watch.
(C) make the watch more attractive.
(D) stop the watch from speeding up.

Answer: (B) provide an energy source for the watch.
Answer: (A) reduce the cost of the watch.
Question: A student examines a new watch design. The watch has a small solar cell on its face. The main function of the solar cell is to
(A) reduce the cost of the watch.
(B) provide an energy source for the watch.
(C) make the watch more attractive.
(D) stop the watch from speeding up.
Answer: (B) provide an energy source for the watch.