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 . Our model is seen to match with the real COVID-19 data of India till May 15  , 2020.
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 is extensively studied. Numerical simulation of our model is matched with the real COVID-19 data of India till May 15 , 2020.