Passage I
If a gum is added to water (such as the water in a food product ), the viscosity (resistance to flow) of the resulting aqueous mixture changes. Table 1 shows, for each of 4 gums (Gums W, X, Y, and Z), the viscosity, in centipoise (cP), of a 1.0% by mass aqueous mixture of the gum at 3 temperatures and at 3 resting times. A resting time is a period of time an aqueous mixture of a gum sits at rest just after having been prepared.
Figure 1 shows, for a certain temperature and a certain resting time, how the viscosity of aqueous mixtures of each of the 4 gums varies with gum concentration in percent by mass.
5. Based on Table 1, a 1.0% aqueous mixture of Gum Z at 30°C and a resting time of 75 min would most likely have a viscosity closest to which of the following?
Your Answer is
Correct Answer is B
Explanation
When the temperature is 30°C, the viscosity of Gum Z should be between 25-45°C. Looking at table 1, when the resting time is 75 minutes, the viscosity of Gum Z should be between 1562-1879, so the 1750 of option B fits this range