56.

What device for new parents did Ann Moore invent in 1969?
A. Bottle warmer B. Baby monitor
C. Disposable diaper D. Infant carrier
Answer and Explanation
Answer:D
Explanation: Ann got the idea for the Snugli infant carrier from the traditional African baby carriers she observed while a volunteer for the Peace Corps in Africa.
57.

In which decade was the transistor invented?
A. 1940s B. 1950s
C. 1960s D. 1980s
Answer and Explanation
Answer:A
Explanation: On December 23, 1947, William Shockley, Walter Brattain and John Bardeen, of Bell Labs, announced their discovery of the point-contact germanium transistor to management.
58.

What Igor Sikorsky invented?
A. Hydroplane B. Jet engine airplane
C. Helicopter D. Glider
Answer and Explanation
Answer:C
Explanation: Invented in 1939.
59.

What Henry Bessemer invented?
A. Aluminum B. Electroplating
C. Steel Converter D. Steel rolling mill
Answer and Explanation
Answer:C
Explanation: Invented in 1856.
60.

What invention was first installed at a Hartford, Connecticut bank in 1889?
A. Automatic teller machine B. Time-lock safe
C. Burglar alarm D. Pay telephone
Answer and Explanation
Answer:D
Explanation: William Gray, inventor of the pay telephone, also invented the inflatable chest protector worn by baseball umpires and catchers.