If the efficiencies of BOD removal of first-stage and second-stage trickling filters are each 65.0%, then what is the overall BOD removal efficiency of these filters ?
A particle moves with simple harmonic motion. If its acceleration at distance 'D' from the equilibrium position is 'A' then the period of the motion is given by
Consider the following statements : A high lime content in a composite cement-lime mortor results in 1. slow hardening. 2. quick setting. 3. weaker mortar. Of these statements :
