World Science and Technology – Exercise – 1

26. After the first photons of light are produced, which process is responsible for amplification of the light?

(a) Blackbody radiation
(b) Stimulated emission
(c) Planck’s radiation
(d) Einstein oscillation

Answer
Answer : (b)
Explanation
Explanation : The word “laser” is actually an acronym for light amplification by stimulated emission of radiation. Atoms or molecules of the active medium that have been excited to a higher energy level are stimulated by a passing photon to relax to a lower energy level and emit a photon that is indistinguishable from the passing photon, thereby increasing the number of photons like the incident one. Let us discuss.
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27. What does AM mean?

(a) Angelo marconi
(b) Anno median
(c) Amplitude modulation
(d) Amperes

Answer
Answer : (c)
Explanation
Explanation : Amplitude modulation was the first type to be used in radio. It works well with HF and morse code. Let us discuss.
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28. What frequency range is the High Frequency band?

(a) 100 kHz
(b) 1 GHz
(c) 30 to 300 MHz
(d) 3 to 30 MHz

Answer
Answer : (d)
Explanation
Explanation : The HF band is based on frequencies 3 to 30 Mhz. AM radio stations are in the HF band but normally are stated in kilohertz. Let us discuss.
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29. What does DOCSIS stand for?

(a) Data Over Cable Service Interface Specification
(b) Data Over Cable Security Internet Std
(c) Data Over Cable Secure International Stds
(d) Data Over Cable Service Internet Standard

Answer
Answer : (a)
Explanation
Explanation : DOCSIS was developed by CableLabs. A standard set for Cable equipment to ensure compatibility across all DOCSIS networks. Let us discuss.
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30. What is a MAC?

(a) A Computer made by Apple
(b) Memory Address Corruption
(c) Mediocre Apple Computer
(d) Media Access Control

Answer
Answer : (d)
Explanation
Explanation : MAC is short for Media Access Control address, an address unique to every piece of network hardware. Let us discuss.
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