41. Antibiotics are produced by:
A) Chemical synthesis only
B) Microorganisms
C) Metals
D) Plants only
Answer: B
42. Fermentation is used to produce:
A) Ethanol
B) Methane
C) CO₂
D) Oxygen
Answer: A
43. Which industry uses fermentation?
A) Petrochemical
B) Biochemical
C) Cement
D) Steel
Answer: B
44. The main source of industrial energy is:
A) Coal
B) Oil
C) Natural gas
D) All of these
Answer: D
45. Which gas is used as fuel in industries?
A) CO₂
B) CH₄
C) SO₂
D) NO₂
Answer: B
46. Catalysts increase reaction rate by:
A) Increasing temperature
B) Lowering activation energy
C) Increasing pressure
D) Increasing concentration
Answer: B
47. Green chemistry focuses on:
A) Maximum production
B) Environmental protection
C) Profit
D) Speed
Answer: B
48. Recycling reduces:
A) Waste
B) Cost
C) Pollution
D) All of these
Answer: D
49. Which industry produces cement?
A) Chemical industry
B) Petrochemical industry
C) Cement industry
D) Metallurgical industry
Answer: C
50. Industrial chemistry deals with:
A) Lab reactions only
B) Large-scale chemical production
C) Biological processes
D) Atomic theory
Answer: B