Use the dictionary, the acronym finder, and the word origins dictionary (links above) as needed. A new quiz is available each Monday through Thursday. This is the quiz for April 23.
Orville and Wilbur Wright built their own wind tunnel to test airfoils and measure how to lift a flying machine into the sky. They were the first to discover that a long, narrow wing shape is ideal for flight. They figured out how to move the vehicle freely, not just across land but up and down on a cushion of air. They built a moveable part of the tail to control the pitch of their craft as it nosed up and down. They fashioned a pair of twin rudders in back to control its tendency to swerve off course. They devised a pulley system that warped the shape of the wings in midflight to turn the plane and to stop it from rolling side-to-side.
They used the data from their wind-tunnel experiments to design the first effective airplane propellers.
When they discovered that a lightweight gas-powered engine did not exist, they designed and built their own.
1. The main idea of this article is
A. Wright brothers' firsts.
B. how the Wright brothers worked.
C. Wright brothers' knowledge.
D. the genius of the Wright brothers.
2. Pitch in this context means
A. plunge forward.
B. move abruptly.
C. deviation from the horizontal.
D. throw or toss.
3. Airfoils are
A. the surfaces of an airplane.
B. the force of air on an airplane.
C. blades.
D. the parts of an airplane that react against the air, such as a wing or propeller.
4. A major problem that the article mentions is an airplane's tendency to
A. be unsteady.
B. be too heavy.
C. lack power.
D. break apart.
Use the dictionary, the acronym finder, and the word origins dictionary (links above) as needed. A new quiz is available each Monday through Thursday. This is the quiz for April 23.