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Solution


Q.

The vehicles carrying inflammable fluids usually have metallic chains touching the ground                 [2024]
1 to alert other vehicles  
2 it is a custom  
3 to conduct excess charge due to air friction to ground and prevent sparking  
4 to protect tyres from catching dirt from ground  

Ans.

(3)   

         Due to friction, fluids get charged, this can result in combustion.

          So, metallic chains is used to discharge excess charge.