41.

What does AM mean?
A. Angelo marconi B. Anno median
C. Amplitude modulation D. Amperes
Answer and Explanation
Answer:C
Explanation: Amplitude modulation was the first type to be used in radio. It works well with HF and morse code.
42.

In what year was the "@" chosen for its use in e-mail addresses?
A. 1976 B. 1972
C. 1980 D. 1984
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.
43.

'.TXT' extension refers usually to what kind of file?
A. Text File B. Image file
C. Audio file D. Adobe Acrobat file
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
44.

What was the first ARPANET message?
A. "lo" B. "hello world"
C. "mary had a little lamb" D. "cyberspace, the final frontier"
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
45.

The NTSC (National Television Standards Committee) is also used in the country of...?
A. Japan B. France
C. Germany D. England
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.