Exercise 2

Question 1 :

When were blue jeans invented?

A). 1900s
B). 1860s
C). 1870s
D). 1850s
Answer : Option D

Explanation :

The first blue jeans were invented by tailor Levi Strauss, who invented tougher working pants for the miners of the California Gold Rush.

Question 2 :

Who invented Electric Generator?

A). Sir Alexander Graham Bell
B). Michael Faraday
C). Alfred B. Nobel
D). Thomas Alva Edison
Answer : Option B

Question 3 :

What device for new parents did Ann Moore invent in 1969?

A). Bottle warmer
B). Baby monitor
C). Disposable diaper
D). Infant carrier
Answer : Option 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.

Question 4 :

In which decade was the transistor invented?

A). 1940s
B). 1950s
C). 1960s
D). 1980s
Answer : Option 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.

Question 5 :

What Igor Sikorsky invented?

A). Hydroplane
B). Jet engine airplane
C). Helicopter
D). Glider
Answer : Option C

Explanation :

Invented in 1939.