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  • Question

  • Damage to hearing is caused by sounds which exceed


  • Options
  • A. 70 decibels
  • B. 80 decibels
  • C. 100 decibels
  • D. 120 decibels

  • Correct Answer
  • 120 decibels 

    Explanation

    High frequency sound attacks the tympanic memberance and makes it defective. 120 decibels is too high a pitch to be heard and therefore it impairs the hearing ability.

    • More questions

    • 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

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