Which vitamin deficiency causes skin inflammation, eczema, and diarrhea? a. Ascorbic acid b. Folic acid c. Nicotinic acid d. Pantothenic acid Ans: c
Which fibre is used in the manufacture of bulletproof vests? a. Nylon-66 b. Terylene c. Kevlar d. Lexan Ans: c
What is the chemical bond between two amino acids in a protein called? a. Ester bond b. Glycosidic bond c. Peptide bond d. Phosphodiester bond Ans: c
What is the full form of PVC? a. Phosphonil Vinyl Carbonate b. Polyvinyl S Carbonate c. Polyvinyl Carbonate d. Polyvinyl Chloride Ans: d
Viruses are composed of which of the following components? a. Nucleic acids and carbohydrates b. Carbohydrates and proteins c. Nucleic acids and proteins d. All of the above Ans: c
Which fibre is commonly used in making bristles of brushes? a. Kevlar b. Nylon-66 c. Terylene d. Lexan Ans: b
Xerophthalmia is caused by the deficiency of which vitamin? a. Vitamin B3 b. Vitamin B12 c. Vitamin A d. Vitamin C Ans: c
Which of the following is an incorrect statement about natural rubber? a. It is an elastomer b. It is a monomer of cis-isoprene c. It is a polymer of chloroprene d. It is vulcanized with sulphur compounds Ans: c
Which vitamin is essential for blood clotting? a. Vitamin A b. Vitamin B12 c. Vitamin K d. Vitamin D Ans: c
Which statements about enzymes and proteins are correct?
All proteins are enzymes
All enzymes are proteins
All enzymes are not proteins
All proteins are not enzymes a. 1 and 3 b. 2 and 4 c. 1, 2 and 3 d. 2, 3 and 4 Ans: b
What does PET stand for in plastic manufacturing? a. Polyethylene terephthalate b. Polyethyl Terelene c. Polyethylene triphosphate d. Polyethyl tetrachloride Ans: a
Which gas is essential for protein synthesis? a. Nitrogen (N₂) b. Oxygen (O₂) c. Carbon dioxide (CO₂) d. Chlorine (Cl₂) Ans: a
Soap is chemically a salt of which substance? a. Fatty acid b. Glycol c. Phosphorous d. Ammonium carbonate Ans: a
The brand name ‘Teflon’ represents which polymer? a. Polystyrene b. Polypropylene c. Polytetrafluoroethylene d. Polyethylene terephthalate Ans: c
Yeast is a rich source of which vitamin? a. Vitamin C b. Protein c. Vitamin B d. Invertase Ans: c
Which compound is primarily used in the production of Bakelite? a. Ethyl alcohol b. Phenol c. Ortho-cresol d. Catechol Ans: b
Which alkaloid is naturally found in coffee, cocoa, and cola nut? a. Cocaine b. Morphine c. Tannin d. Caffeine Ans: d
Rayon is manufactured using which raw material? a. Coal b. Petroleum c. Cellulose d. Plastic Ans: c
Enzymes are chemically classified as: a. Carbohydrates b. Lipids c. Proteins d. None of these Ans: c
Barbituric acid and its derivatives are known as: a. Tranquilizers b. Antiseptics c. Antibiotics d. Antipyretics Ans: a
Which gas is common in both natural gas and biogas? a. Methane b. Butane c. Hydrogen d. Carbon monoxide Ans: a
The helical structure of proteins is stabilized by: a. Dipeptide bonds b. Hydrogen bonds c. Ester bonds d. Peptide bonds Ans: b
Which elements primarily contributed to the origin of life on Earth? a. Hydrogen, Oxygen, Sodium b. Carbon, Hydrogen, Nitrogen c. Oxygen, Calcium, Phosphorus d. Carbon, Hydrogen, Potassium Ans: b
Which sugar is not a disaccharide? a. Lactose b. Galactose c. Sucrose d. Maltose Ans: b
Carbon dioxide increases the Earth’s temperature because it absorbs: a. Water vapour and retains its heat b. Ultraviolet rays of sunlight c. All types of solar radiation d. Infrared radiation from the sun Ans: d
Which of the following is a non-reducing sugar? a. Glucose b. Sucrose c. Maltose d. Lactose Ans: b
What is the role of UV radiation in water purification systems?
Kills harmful microorganisms
Removes bad odour
Speeds up sedimentation and improves clarity a. Only 1 b. 2 and 3 only c. 1 and 3 only d. All of the above Ans: a
Who is credited with the discovery of Nylon? a. Louis Pasteur b. John Cabot c. J. Nicephore Niepce d. Dr. Wallace H. Carothers Ans: d
Ozone is primarily found in the Earth’s atmosphere between: a. 5 – 10 km b. 10 – 200 km c. 20 – 50 km d. 50 – 100 km Ans: c
Which of the following is a natural polymer? a. Bakelite b. Cellulose c. PVC d. Nylon Ans: b
