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- Question
Once the active medium is excited, the first photons of light are produced by which physical process?
Options- A. Blackbody radiation
- B. Spontaneous emission
- C. Synchrotron radiation
- D. Planck?s oscillation
- Correct Answer
- Spontaneous emission
ExplanationSpontaneous emission is what you see with most "glow in the dark" toys. You excite the toy by exposing it to bright light, then the toy glows in the dark by spontaneously emitting photons as the excited atoms relax back down to their normal state. - 1. What does AM mean?
Options- A. Angelo marconi
- B. Anno median
- C. Amplitude modulation
- D. Amperes Discuss
- 2. Voltage is sometimes referred to as EMF, or Electromotive...?
Options- A. Field
- B. Factor
- C. Flash
- D. Force Discuss
- 3. What will a UPS be used for in a building?
Options- A. To provide power to essential equipment
- B. To monitor building electricity use
- C. To carry messages between departments
- D. To control lighting and power systems Discuss
- 4. Made from a variety of materials, such as carbon, which inhibits the flow of current...?
Options- A. Choke
- B. Inductor
- C. Resistor
- D. Capacitor Discuss
- 5. Gandhi Peace Prize for the year 2000 was awarded to the former President of South Africa along with
Options- A. Sathish Dawan
- B. C. Subramanian
- C. Grameen Bank of Bangladesh
- D. World Healt Organisation Discuss
- 6. '.TXT' extension refers usually to what kind of file?
Options- A. Text File
- B. Image file
- C. Audio file
- D. Adobe Acrobat file Discuss
- 7. 'DTP' computer abbreviation usually means?
Options- A. Digital Transmission Protocol
- B. DeskTop Publishing
- C. Data Type Programming
- D. Document Type Processing Discuss
- 8. Which is a type of Electrically-Erasable Programmable Read-Only Memory?
Options- A. Flash
- B. Flange
- C. Fury
- D. FRAM Discuss
- 9. What is the relationship between resistivity r and conductivity s?
Options- A. R = s2
- B. R = s
- C. R > s
- D. R = 1/s Discuss
- 10. A given signal's second harmonic is twice the given signal's __________ frequency...?
Options- A. Fourier
- B. Foundation
- C. Fundamental
- D. Field Discuss
Technology problems
Search Results
Correct Answer: Amplitude modulation
Explanation:
Amplitude modulation was the first type to be used in radio. It works well with HF and morse code.
Correct Answer: Force
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?
Correct Answer: To provide power to essential equipment
Explanation:
UPS stands for Uninterruptible Power Supply. Examples of equipment that may require a UPS supply are computers, fire detection systems, hospital operating theatre equipment and escape route lighting.
Correct Answer: Resistor
Explanation:
So named because it resists (or inhibits) the flow of current.
Correct Answer: Grameen Bank of Bangladesh
Correct Answer: Text File
Correct Answer: DeskTop Publishing
Correct Answer: Flash
Explanation:
It's commonly used for MP3 players, computer BIOS code and "thumb" drives. Originally developed in Japan by Toshiba, it has become quite popular for products requiring non-volatile erasable memory. Flash devices have a limited number of erase cycles (typically 10,000 to 1,000,000 cycles) so they're not as good a choice for applications in which the data changes constantly. However, since it has no moving parts (unlike a hard disk) it is an excellent choice for storing the operating code for small personal electronics like PDAs, cell phones, digital cameras, and the data in items like MP3 players.
Correct Answer: R = 1/s
Correct Answer: Fundamental
Explanation:
A given signal's second harmonic is twice the given signal's fundamental frequency. Harmonics are generated when there are non-linearities in an amplifier (there are always non-linearities). The worse the non-linearities, the more harmonics. A signal at 27.5 MHz (approximate frequency for US citizen's band) would have a second harmonic at 55.0 MHz (on US channel 2!). Can you see why there might be problems? A CB operator might do well to place a low-pass filter on his radio.
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