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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. When was the first elevator built?
Options- A. 1743
- B. 1739
- C. 1760
- D. 1785 Discuss
- 2. The hardest form of carbon is
Options- A. coke
- B. graphite
- C. diamond
- D. charcoal Discuss
- 3. The mica belt of the Himalayas, the major part of it is situated in
Options- A. Andhra Pradesh
- B. Bihar
- C. Rajasthan
- D. West Bengal Discuss
- 4. The first 'Financial Service Park' for industry being set up at
Options- A. Guragaon
- B. Surat
- C. Bangalore
- D. Pune Discuss
- 5. http://www.CuriousTab.com - is an example of what?
Options- A. A URL
- B. An access code
- C. A directory
- D. A server Discuss
- 6. First human heart transplant operation conducted by Dr. Christiaan Barnard on Louis Washkansky, was conducted in
Options- A. 1967
- B. 1968
- C. 1958
- D. 1922 Discuss
- 7. The working language(s) of the UNESCO is/are
Options- A. French only
- B. English only
- C. English and French
- D. English, French and Russian Discuss
- 8. Ralph Samuelson was only 18 when he invented this sporting item in 1922. What was that?
Options- A. Golf tee
- B. Motorboat
- C. Water skis
- D. Hang glider Discuss
- 9. Rahul Dravid also made Test debut along with Sourav Ganguly in the same match.He scored 95 runs. How many fours did he hit in that innings of 95 runs?
Options- A. 6
- B. 10
- C. 5
- D. 7 Discuss
- 10. The smallest glaciers are
Options- A. mountain or alpine glaciers
- B. continental glaciers
- C. piedmont glaciers
- D. None of the above Discuss
More questions
Correct Answer: 1743
Explanation:
The first elevator was built in the palace of King Louis XV. It only traveled up one floor, and was hand powered by men inside the chimney.
Correct Answer: diamond
Correct Answer: Bihar
Correct Answer: Guragaon
Correct Answer: A URL
Explanation:
A URL (Uniform {or Universal} Resource Locator) is an address for a specific document found on the Web. It is made up of several components: a domain name, the directories and subdirectories of the site, and the extension. To learn about these parts of a URL, visit the Evaluating Web Sites tutorial.
Correct Answer: 1967
Explanation:
Louis Washkansky (1913 - 21 December 1967) was the recipient of the world's first human heart transplant.
Washkansky died of double pneumonia eighteen days after the transplant because of a weakened immune system.
Correct Answer: English and French
Correct Answer: Water skis
Explanation:
The new item was first used on Lake Pepin in Minnesota.
Correct Answer: 6
Explanation:
The match was drawn.
Correct Answer: mountain or alpine glaciers
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