engineering recuitment FSSAI Technical Officer & Central Food Safety Officer Mock Test 2021 General Science Biology Scientific Developments

निम्नलिखित में से पहला मानव निर्मित प्लास्टिक कौन सा था?

1
बैकलाइट 
2
पॉलिथीन
3
सैलूलॉयड
4
नायलॉन
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