For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

• A. ratio of inertial force to force due to gravitation
• B. ratio of inertial force to force due to viscosity
• C. all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity
• D. ratio of inertial force to force due to surface tension

Answer: (C)