railway RRB Technician Grade 3 Mock Test 2024 General Science Chemistry

ବାୟୁ ଗୁଣବତ୍ତା ନିଶ୍ଚିତ କରିବା ପାଇଁ ଅଙ୍ଗାରକାମ୍ଳ ପାଇଁ ପ୍ରାଥମିକ ମାନକ ସ୍ତର କ’ଣ?

1
90 ppm
2
1 ppm
3
9 ppm
4
10 ppm
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