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- Question
What are three types of lasers?
Options- A. Gas, metal vapor, rock
- B. Pointer, diode, CD
- C. Diode, inverted, pointer
- D. Gas, solid state, diode
- Correct Answer
- Gas, solid state, diode
ExplanationThe first laser was a solid state laser. Solid state refers to any solid material like a glass rod. Diode lasers are very common because they are used to read compact disks and digital video disks in computers, CD players, and DVD players. Before diode lasers, the most common type of laser may have been the helium-neon laser, in which the active medium is a combination of the two gasses helium and neon. - 1. United Nations adapted a Charter of Economic Rights in the year
Options- A. 1969
- B. 1974
- C. 1956
- D. 1964 Discuss
- 2. The intersecting lines drawn on maps and globes are
Options- A. latitudes
- B. longitudes
- C. geographic grids
- D. None of the above Discuss
- 3. The budget deficit means
Options- A. the excess of total expenditure, including loans, net of lending over revenue receipts
- B. difference between revenue receipts and revenue expenditure
- C. difference between all receipts and all the expenditure
- D. fiscal deficit less interest payments Discuss
- 4. The infrared radiation by sun are strongly absorbed by
Options- A. carbon dioxide
- B. water vapours
- C. carbon dioxide and water vapours
- D. ozone Discuss
- 5. The Board of Industrial and Financial Reconstruction (BIFR) came into existence in
Options- A. 1984
- B. 1986
- C. 1987
- D. 1989 Discuss
- 6. Eugenics is the study of
Options- A. altering human beings by changing their genetic components
- B. people of European origin
- C. different races of mankind
- D. genetic of plants Discuss
- 7. The highest mountains in Africa, which is not part of any mountains chain, is
Options- A. Mt. Aconcagua
- B. Mt. Kilimanjaro
- C. Mt. Kosciuszko
- D. Mont Blanc Discuss
- 8. How many former republics of USSR have become members of the Commonwealth of Independent States?
Options- A. 11
- B. 10
- C. 12
- D. 9 Discuss
- 9. The length of the tropical years (the time interval between successive occurrences of the spring equinox) is decreasing very slowly as a result of
Options- A. small, progressive changes in the earth's rotational speed
- B. small, progressive change in earth's orbit around the sun
- C. both (a) and (b)
- D. None of the above Discuss
- 10. The term Khalisa in Mughal administration signified the
Options- A. entire Imperial establishment
- B. land owned b the emperor himself
- C. religious land grants
- D. land from where revenue was collected for the Imperial Treasury Discuss
More questions
Correct Answer: 1974
Correct Answer: geographic grids
Correct Answer: difference between all receipts and all the expenditure
Correct Answer: carbon dioxide
Correct Answer: 1987
Correct Answer: altering human beings by changing their genetic components
Correct Answer: Mt. Kilimanjaro
Correct Answer: 11
Correct Answer: both (a) and (b)
Correct Answer: land owned b the emperor himself
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