#1 and #2 Review

What was the earliest recognized device for computing?

• papyrus tables
• the abacus
• the astrolabe
• the slide rule

On this abacus, with rows representing powers of ten, what number is shown?

• 2,512

• 1,521

• 1,251

• 5,121

In the early days, a "computer" was ___

• any new tool that aided calculations
• a person who did calculations
• a series of step reckoners
• a device for storing data

To meet demand for his tabulating machines, Hollerith founded ___

• Dell Computer Company
• Compaq Computers
• The Tabulating Machine Company
• The U.S. Census Bureau

The electrically-controlled mechanical switches used in room-sized computers were called ___

• mechanical relays
• transistors
• vacuum tubes
• dipole switches

In 1906, what did Lee de Forest add to the Fleming valve?

• a glass envelope
• a third “control” electrode
• a mechanical relay
• a dipole switch

In 1904, English physicist John Ambrose Fleming developed the first ___

• mechanical relay
• vacuum tube
• transistor
• integrated circuit

Who built an electro-mechanical machine, called the Bombe, at Bletchley Park in the UK?

• Tommy Flowers
• Lee de Forest
• John Ambrose Fleming
• Alan Turing

How many ten-digit additions or subtractions could ENIAC perform per second?

• 50
• 500
• 5,000
• 50,000

A material that can sometimes conduct electricity and other times resist it is called ___

• a semiconductor
• a relay
• a diode
• a ferrous metal