The survey carried out to delineate natural features, such as hills, rivers, forests and manmade features, such as towns, villages, buildings, roads, transmission lines and canals is classified as

A certain soil has the following properties: G_s = 2.71, n = 40% and w = 20%. The degree of saturation of the soil (rounded off to the nearest percent) is _________

The flexural tensile strength of M25 grade of concrete, in N/mm², as per IS:456-2000 is __________.

The target mean strength f_cm for concrete mix design obtained from the characteristic strength (f_ck) and standard deviation $$\sigma$$, as defined in IS:456-2000, is