Exercise 2

Question 21 :

Voltage is sometimes referred to as EMF, or Electromotive...?

A). Field
B). Factor
C). Flash
D). Force
Answer : Option D

Explanation :

The term EMF, or Electromotive Force, its use now in decline, is attributed to Italian physicist Alessandro Volta (1745-1827). Today we generally use the term "voltage" - can you guess why we call it that?

Question 22 :

What does AM mean?

A). Angelo marconi
B). Anno median
C). Amplitude modulation
D). Amperes
Answer : Option C

Explanation :

Amplitude modulation was the first type to be used in radio. It works well with HF and morse code.

Question 23 :

'.BAT' extension refers usually to what kind of file?

A). Compressed Archive file
B). System file
C). Audio file
D). Backup file
Answer : Option B

Question 24 :

What is the term to ask the computer to put information in order numerically or alphabetically?

A). Crop
B). Report
C). Record
D). Sort
Answer : Option D

Question 25 :

The input used by an antenna or cable to a TV set uses frequencies called...?

A). IF
B). RF
C). AF
Answer : Option B

Explanation :

RF is radio frequency. IF is intermediate frequency used inside the TV for processing. AF is audio frequency. SAP is second audio program which may have another language or other soundtrack as an option to the main soundtrack.