সকল সরকারী/বেসরকারী পরীক্ষার প্রশ্ন পেতে ক্লিক করুন গণিতের আইকিউ টেস্ট করতে ক্লিক করুন 
Who invented the miner's safety-lamp?
Who invented the miner's safety-lamp?
- ক. Thomas Savery
- খ. Sir Frank Whittle
- গ. Sir Thomas Malory
- ঘ. Alexander Graham Bell
সঠিক উত্তরঃ Sir Frank Whittle
এ সম্পর্কিত আরো প্রশ্ন দেখুন
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Basic Information of Daily Science, Inventions and...