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Q:

‘पोर्टलैंड सीमेंट’ का आविष्कार किसने किया था?

  • 1
    माइकल फैराडे
  • 2
    गुल्येल्मो मार्कोनी
  • 3
    जोसेफ एस्पडिन
  • 4
    आइजक न्यूटन
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Answer : 3. "जोसेफ एस्पडिन"
Explanation :

Joseph Aspdin discovered 'Portland cement' in the year 1824. He produced cement by heating powdered limestone and mixing it with clay in a furnace. Later, grinding the clinker to a powder. He thus named the product “Portland Cement”.

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