5 Which model explains enzyme action? A Collision model B Lock and key model C Atomic model D Kinetic model
6 Which process involves synthesis of complex molecules? A Catabolism B Anabolism C Digestion D Respiration
7 Which biomolecule acts as catalyst in biological reactions? A Lipids B Carbohydrates C Enzymes D Vitamins
9 The Contact process is used for the manufacture of: A Nitric acid B Hydrochloric acid C Sulphuric acid D Acetic acid
10 Which bond is commonly present in addition polymers? A Ionic bond B Metallic bond C Covalent bond D Hydrogen bond
11 Fractional distillation of petroleum separates components based on: A Density B Melting point C Boiling point D Solubility
15 The reaction between an acid and a base produces: A Gas B Acid only C Salt and water D Metal oxide
18 Which factor increases the strength of polymers? A Short chains B Long chains C Low temperature D Low pressure
19 Enzymes speed up reactions by: A Increasing temperature B Lowering activation energy C Changing products D Increasing pressure
20 Industrial waste water should be: A Released directly B Heated C Treated before disposal D Stored permanently