Before revision:  We consider SEIR type epidemiological models, incorporated with India specific social contact matrix representing contact structures among different age groups of the population , to study the impact of various factors , namely, presence of asymptotic individuals, lockdown strategies, social distancing  , quarantine, and hospitalization , on the disease transmission .
After revision:  We consider SEIR type epidemiological models, incorporated with India specific social contact matrix representing contact structures among different age groups of the population , to study the impact of various factors , namely, presence of asymptotic individuals, lockdown strategies, social distancing , quarantine, and hospitalization on the disease transmission .