As per IS : 1904 - 1986 the permissible angular distortion with respect to steel structures in isolated foundations resting on plastic clay is

\frac{2}{3000}

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\frac{1}{3000}

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\frac{1}{300}

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\frac{2}{300}

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Solution

The correct option is C $\frac{1}{300}$
As per IS : 1904 - 1986

Type of footing MS (mm) DS(mm) AD

A. Isolated footing on plastic clay
(i) for steel structures
(ii) for RCC structures
50

75
0.0033L

0.0015L
$\frac{1}{300}$
$\frac{1}{666}$

B. Raft foundation on plastic clay
(i) for steel structure
(ii) for RCC structure
100

100
0.0033L

0.002L
$\frac{1}{300}$
$\frac{1}{500}$

MS : Maximum Settlement
DS : Differential Settlement
AD : Angular Distortion

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Type of footing	MS (mm)	DS(mm)	AD
A. Isolated footing on plastic clay (i) for steel structures (ii) for RCC structures	50 75	0.0033L 0.0015L	$\frac{1}{300}$ $\frac{1}{666}$
B. Raft foundation on plastic clay (i) for steel structure (ii) for RCC structure	100 100	0.0033L 0.002L	$\frac{1}{300}$ $\frac{1}{500}$
MS : Maximum Settlement DS : Differential Settlement AD : Angular Distortion