- 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