Tagged: ntse science practice

Answer the following questions. 1. The hardness of the bone tissue is due to the phosphates and carbonates of which of the following pairs of elements? a) calcium and sodium b) magnesium and sodium...

Answer the following questions. 1. Which of the following is the working principle of a washing machine? a) centrifugation b) dialysis c) reverse osmosis d) diffusion 2. The tendency of a liquid drop to...