
General Knowledge : General Science QUESTIONS AND ANSWERS :: part1 : 56 to 60
Following General Knowledge Multiple choice objective type questions and answers will help you in TRB, SSC and UPSC 2024 examinations :
56.Permanent hardness of water may be removed by the addition of |
alum |
sodium carbonate |
lime |
potassium permanganate |
57.Ozone attacks |
mercury and silver |
copper |
silver and iron |
None of these |
58.The hardest substance available on earth is |
Platinum |
Coal |
Diamond |
Gold |
59.Which of the following is not an ore of aluminium ? |
Feldspar |
Bauxite |
Cryolite |
Azurite |
60.The most malleable metal is |
Silver |
Gold |
Aluminium |
Sodium |
More General Science QUESTIONS AND ANSWERS available in next pages
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Health is the greatest gift, contentment is the greatest wealth -Buddha

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