a) Plate load test method
b) Electrical resistivity method
c) Seismic refraction method
d) Geophysical method

Answer: a
Explanation: Plate load test method is one of the methods of determination of bearing power of soil. Plate load test method is the improved point method and it is widely used for determination of the bearing capacity. Other methods for determination are the method of loading, method of dropping weight, analytical methods and Presumptive method.