In which decade was the transistor invented?
- A. 1940s
- B. 1950s
- C. 1960s
- D. 1980s
Correct Answer: A. 1940s
On December 23, 1947, The first practically implemented device was a point-contact transistor invented in 1947 by William Shockley, Walter Brattain, and John Bardeen, of Bell Labs, announced their discovery of the point-contact germanium transistor to management.
Correct Answer: D. Fifteen
The Economic Community of West African States (ECOWAS) is a regional political and economic union of fifteen countries located in West Africa. Collectively, these countries comprise an area of 5,114,162 km2 (1,974,589 sq mi), and in 2015 had an estimated population of over 349 million. Considered one of the pillar regional blocs of the continent-wide African Economic Community (AEC), the stated goal of ECOWAS is to achieve “collective self-sufficiency” for its member states by creating a single large trade bloc by building a full economic and trading union. The union was established on 28 May 1975, with the signing of the Treaty of Lagos, with its stated mission to promote economic integration across the region. A revised version of the treaty was agreed and signed on 24 July 1993 in Cotonou.
Correct Answer: D. Saudi Arabia
Correct Answer: C. China
Correct Answer: B. Begum Khaleda Zia
Correct Answer: B. 14 December 1955
Correct Answer: A. Belgium