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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