4 Water pollution is caused by: A Industrial waste B Agricultural runoff C Domestic sewage D All of these
5 Acid rain is mainly caused by oxides of: A Nitrogen and sulphur B Carbon and hydrogen C Oxygen and nitrogen D Chlorine and fluorine
7 Which biomolecule acts as catalyst in biological reactions? A Lipids B Carbohydrates C Enzymes D Vitamins
10 At equilibrium, the concentration of reactants and products: A Are always equal B Become zero C Remain constant with time D Increase continuously