The difference between the sum of the angles of a plane triangle and the sum of the angles of a spherical triangle is one second when the triangle on the earth surface has an area of about

Consider the following statements : 1. The standard penetration test is a reliable method for measuring the relative density of granular soils. 2. For a sand having the same relative density, N-values remain the same at all depths. 3. For a sand having the same relative density, N-values are different at different depths. Which of the statements given above is/are correct ?

In a plane table survey, the plane table station position was to be fixed with respect to three reference points. It was found that one of the reference points was not visible due to some obstruction. It was, therefore decided to make use of the other two points only. Which one of the following statements is true regarding the determination of station position ?