Which polymer is formed from phenol and formaldehyde? a. Benzaldehyde b. Cinnamaldehyde c. Acetaldehyde d. Formaldehyde Ans: d
Which of the following is a synthetic polymer? a. Silk b. Protein c. Polystyrene d. Starch Ans: c
Which fibre is stronger than a steel wire of the same thickness? a. Wool b. Cotton c. Jute d. Nylon Ans: d
Fabric made from which material resists wrinkling the most? a. Cotton b. Flax c. Silk d. Polyester Ans: d
Which element is used in the vulcanization of rubber? a. Sulphur b. Bromine c. Silicon d. Phosphorus Ans: a
Water & Air Pollution, Environment
What causes acid rain? a. Oxides of nitrogen and sulphur b. CO₂ and CO c. Ozone and CO₂ d. CO and nitrogen Ans: a
Which effect is not caused by greenhouse gases? a. Global warming b. Ozone depletion c. Oxygen fertilization d. CO₂ fertilization Ans: c
Photochemical smog results from the reaction among: a. NO₂, O₃, and peroxyacetyl nitrate in sunlight b. CO, O₂, and peroxyacetyl nitrate c. CO, CO₂, and NO₂ at low temperature d. NO₂, O₃, and CO in the evening Ans: a
Which gases are responsible for the greenhouse effect? a. CO₂ and Methane b. Ammonia and Ozone c. CO and SO₂ d. Carbon tetrafluoride and Nitrous oxide Ans: a
Coal-based thermal power plants contribute to acid rain because:
Assertion: They emit pollutants that cause acid rain.
Reason: Burning coal emits carbon oxides. a. Both A and R are true, and R explains A b. Both A and R are true, but R does not explain A c. A is true, R is false d. A is false, R is true Ans: b
Water pollution in rivers is primarily measured by the dissolved amount of: a. Chlorine b. Ozone c. Nitrogen d. Oxygen Ans: d
What causes changes in the physico-chemical characteristics of water sources? a. Aquatic macrophytes b. Aquatic fungi c. Effluents d. Evapotranspiration Ans: c
Candle wax is chemically a mixture of: a. Aliphatic hydrocarbons b. Aromatic hydrocarbons c. Cyclic hydrocarbons d. Aliphatic and aromatic hydrocarbons Ans: a
Which of the following is a petroleum wax? a. Honey wax b. Paraffin wax c. Jojoba wax d. Carnauba wax Ans: b
Petroleum is a mixture of: a. Carbohydrates b. Carbonates c. Hydrocarbons d. Carbides Ans: c
Vitamins, Deficiencies & Nutrition
Match the vitamins with their corresponding chemical names: A. Vitamin A – Retinol B. Vitamin B1 – Thiamine C. Vitamin C – Ascorbic acid D. Vitamin E – Tocopherol Ans: d (A-2, B-1, C-3, D-4)
Match the B-complex vitamins: A. Vitamin B1 – Thiamine B. Vitamin B2 – Riboflavin C. Vitamin B6 – Pyridoxine D. Vitamin B12 – Cyanocobalamin Ans: a (A-3, B-4, C-1, D-2)
Match nutrient deficiencies with diseases: A. Iodine – Goitre B. Iron – Microcytic anaemia C. Niacin – Pellagra D. Vitamin B12 – Pernicious anaemia Ans: d (A-3, B-1, C-4, D-2)
Health, Drugs & Medical Chemistry
Which disease is caused by unsterilized surgical instruments or wounds? a. Kala Azar b. Chancroid c. Diphtheria d. Tetanus Ans: d
Which class of drugs is used to treat stress? a. Tranquilizers b. Diuretics c. Painkillers d. Antihistamines Ans: a
The branch of medicine based on synthetic chemical compounds is called: a. Allopathy b. Homeopathy c. Unani d. Ayurveda Ans: a
Zinc phosphide is commonly used as: a. Fungicide b. Herbicide c. Rodenticide d. None of these Ans: c
Which gas is commonly used to destroy microbes in water? a. Chlorine b. Oxygen c. Hydrogen d. Neon Ans: a
Food Chemistry & Biochemical Processes
Glycogen, cellulose, and starch are polymers of: a. Fructose b. Glucose c. Lactose d. Maltose Ans: b
Hydrolysis of sucrose in water produces: a. Only lactose b. Only glucose c. Glucose and fructose d. Glucose and lactose Ans: c
Why do fruits stored in cold chambers have longer shelf life? a. Sunlight is blocked b. Higher CO₂ concentration c. Respiration rate is decreased d. Increased humidity Ans: c
Why is glycol added to aviation fuel? a. Prevents freezing b. Reduces fuel consumption c. Reduces evaporation d. Increases efficiency Ans: a
Miscellaneous
Which gases are used as rocket propellant fuel? a. Liquid Hydrogen + Liquid Nitrogen b. Liquid Oxygen + Liquid Argon c. Liquid Nitrogen + Liquid Oxygen d. Liquid Hydrogen + Liquid Oxygen Ans: d
Match greenhouse gases with their major sources: A. CO₂ – Burning fossil fuels B. Methane – Enteric fermentation in cattle C. CFCs – Air conditioners and refrigeration D. Nitrous Oxide – Nylon production Ans: a (A-2, B-1, C-5, D-4)
Synthetic detergents can lather in hard water because:
Assertion: They lather well in hard water.
Reason: They form soluble salts with Ca²⁺ and Mg²⁺ a. Both A and R are true, and R explains A b. Both A and R are true, but R doesn’t explain A c. A is true, R is false d. A is false, R is true Ans: a
