Question 7
Original source text (the exact panel preserves diagram labels, tables and choices):
Earl set up an experiment in a dark room as shown in Fig. 1. He then changed the
variable X and counted the number of bubbles in the tube. He kept the other
variables constant. His results are shown in Fig. 2.
Which of the following could be variable X?
A. Number of bubbles C. Amount of water
B. Distance of torch and the beaker D. Type of water plant
Earl set up an experiment in a dark room as shown in Fig. 1. He then changed the
variable X and counted the number of bubbles in the tube. He kept the other
variables constant. His results are shown in Fig. 2.
Which of the following could be variable X?
A. Number of bubbles C. Amount of water
B. Distance of torch and the beaker D. Type of water plant