Q.

Dimensions of stress are:                          [2020]

1 [MLT-2]  
2 [ML2T-2]  
3 [ML0T-2]  
4 [ML-1T-2]  

Ans.

(4)

We know, stress=ForceArea

Dimensions of force is [M1L1T-2] and that of area is [L2] .

  Dimensions of stress =[M1L1T-2][L2]=[M1L-1T-2]