TASK DEFINITION: Given a scientific passage and an answer, generate a question for the given answer.
PROBLEM: Passage: Zinc reacting with hydrochloric acid produces bubbles of hydrogen gas. Answer: hydrogen

SOLUTION: Zinc reacting with hydrochloric acid produces bubbles of which gas?

PROBLEM: Passage: Waves are characterized by their ability to constructively and destructively interfere . Light waves which interfere with themselves after interaction with a small aperture or target are said to diffract . Answer: diffract

SOLUTION: Light waves which interfere with themselves after interaction with a small aperture or target are said to what?

PROBLEM: Passage: When you pour a glass of water, or fill a car with gasoline, you observe that water and gasoline flow freely. But when you pour syrup on pancakes or add oil to a car engine, you note that syrup and motor oil do not flow as readily. The viscosity of a liquid is a measure of its resistance to flow. Water, gasoline, and other liquids that flow freely have a low viscosity. Honey, syrup, motor oil, and other liquids that do not flow freely, like those shown in Figure 10.15, have higher viscosities. We can measure viscosity by measuring the rate at which a metal ball falls through a liquid (the ball falls more slowly through a more viscous liquid) or by measuring the rate at which a liquid flows through a narrow tube (more viscous liquids flow more slowly). Answer: resistance to flow

SOLUTION:
The viscosity of a liquid is a measure of what?