As per Indian Standard Soil Classification System (IS: 1498-1970),

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As per Indian Standard Soil Classification System (IS: 1498-1970), an expression for A-line is

1. I_p = 0.73 (W_L – 20)
2. I_p = 0.70 (W_L – 20)
3. I_p = 0.73 (W_L – 10)
4. I_p = 0.70 (W_L – 10)

Correct Option: A

I_p = 0.73 (W_l – 20)