railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Periodic Table

ପେନ୍ସିଲ୍ ଲିଡ୍ ତିଆରି ପାଇଁ ନିମ୍ନଲିଖିତ ମଧ୍ୟରୁ କେଉଁଟି ବ୍ୟବହୃତ ହୁଏ?

1
​ସଲଫର 
2
କୌଣସିଟି ନୁହେଁ 
3
ହୀରା 
4
ଗ୍ରାଫାଇଟ୍ 
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