If the size of panel in a flat slab is 6m x 6m, then as per Indian Standard Code, the widths of column strip and middle strip are A. 3.0 m and 1.5 m B. 1.5 m and 3.0 m C. 3.0 m and 3.0 m D. 1.5 m and 1.5 m

The correct answer is A. 3.0 m and 1.5 m.

The width of the column strip is equal to the distance from the center of one column to the center of the adjacent column. The width of the middle strip is equal to the distance from the center of the column strip to the edge of the panel.

For a 6m x 6m panel, the width of the column strip is 3m and the width of the middle strip is 1.5m.

The following is a brief explanation of each option:

Option A: 3.0 m and 1.5 m. This is the correct answer. The width of the column strip is equal to the distance from the center of one column to the center of the adjacent column. The width of the middle strip is equal to the distance from the center of the column strip to the edge of the panel. For a 6m x 6m panel, the width of the column strip is 3m and the width of the middle strip is 1.5m.

Option B: 1.5 m and 3.0 m. This is incorrect. The width of the column strip is not equal to the width of the middle strip. The width of the column strip is always greater than the width of the middle strip.

Option C: 3.0 m and 3.0 m. This is incorrect. The width of the column strip is not equal to the width of the panel. The width of the column strip is always less than the width of the panel.

Option D: 1.5 m and 1.5 m. This is incorrect. The width of the middle strip is not equal to the width of the panel. The width of the middle strip is always less than the width of the panel.