সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
Which one of the following is an air-pollutant present in the atmosphere?
Which one of the following is an air-pollutant present in the atmosphere?
- ক. nitrogen
- খ. hydrogen
- গ. oxygen
- ঘ. carbon monoxide
সঠিক উত্তরঃ carbon monoxide
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Basic Information of Daily Science, Inventions and...