সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
By what name is water which contains soluble salts of calcium and magnesium known?
By what name is water which contains soluble salts of calcium and magnesium known?
- ক. hard water
- খ. mineral water
- গ. soft water
- ঘ. heavy water
সঠিক উত্তরঃ hard water
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