Engineering Chemistry (Practice Test MCQs)

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1. Which of the following is a noble gas?
(A) Oxygen
(B) Nitrogen
(C) Helium
(D) Chlorine

2. pH value of pure water at 25°C is:
(A) 0
(B) 7
(C) 10
(D) 14

3. The molecular mass of water (H₂O) is:
(A) 16 g/mol
(B) 18 g/mol
(C) 20 g/mol
(D) 22 g/mol

4. Which type of bond is present in NaCl?
(A) Covalent bond
(B) Ionic bond
(C) Metallic bond
(D) Hydrogen bond

5. Which of the following is a greenhouse gas?
(A) Oxygen
(B) Nitrogen
(C) Carbon dioxide
(D) Argon

6. The chemical formula of washing soda is:
(A) NaCl
(B) Na₂CO₃·10H₂O
(C) NaHCO₃
(D) Na₂SO₄

7. Which law explains the relationship between pressure and volume of a gas?
(A) Charles’s Law
(B) Boyle’s Law
(C) Avogadro’s Law
(D) Dalton’s Law

8. The element used in the vulcanization of rubber is:
(A) Sulfur
(B) Phosphorus
(C) Chlorine
(D) Silicon

9. Which of the following is an example of a strong acid?
(A) Acetic acid
(B) Hydrochloric acid
(C) Carbonic acid
(D) Boric acid

10. The term BOD in water analysis stands for:
(A) Biological Oxygen Demand
(B) Basic Oxygen Determination
(C) Biochemical Oxidation Degree
(D) Biological Oxide Density

11. Which element is present in chlorophyll responsible for photosynthesis?
(A) Iron
(B) Calcium
(C) Magnesium
(D) Copper

12. The chemical symbol for gold is:
(A) Ag
(B) Au
(C) Gd
(D) Ga

13. Which is used as an antifreeze in automobile radiators?
(A) Methanol
(B) Glycerol
(C) Ethylene glycol
(D) Acetone

14. Which gas is used for the artificial ripening of fruits?
(A) Carbon dioxide
(B) Ethylene
(C) Oxygen
(D) Ammonia

15. The main constituent of cement is:
(A) Gypsum
(B) Lime
(C) Silica
(D) Alumina

16. The hardness of water is mainly due to the presence of:
(A) Sodium and Potassium salts
(B) Calcium and Magnesium salts
(C) Iron and Aluminum salts
(D) Chloride and Sulfate salts

17. Which acid is known as the king of chemicals?
(A) Hydrochloric acid
(B) Nitric acid
(C) Sulfuric acid
(D) Phosphoric acid

18. Which of the following is used in the manufacture of soap?
(A) Potassium hydroxide
(B) Sodium hydroxide
(C) Both A and B
(D) Calcium hydroxide

19. The pH of acidic solution is always:
(A) Greater than 7
(B) Less than 7
(C) Equal to 7
(D) Zero only

20. The process of coating iron with zinc is called:
(A) Alloying
(B) Electroplating
(C) Galvanization
(D) Anodization

21. Which of the following is an example of a polymer?
(A) Glucose
(B) Nylon
(C) Methane
(D) Benzene

22. The chemical used for water softening in ion-exchange method is:
(A) Zeolite
(B) Sodium chloride
(C) Potassium permanganate
(D) Aluminum sulfate

23. Rusting of iron is an example of:
(A) Reduction
(B) Oxidation
(C) Hydrolysis
(D) Polymerization

24. Which element is liquid at room temperature?
(A) Mercury
(B) Sodium
(C) Lithium
(D) Potassium

25. The bleaching action of chlorine is due to:
(A) Oxidation
(B) Reduction
(C) Hydrolysis
(D) Adsorption

26. Which gas is known as laughing gas?
(A) Carbon monoxide
(B) Nitrous oxide
(C) Nitric oxide
(D) Ammonia

27. The main component of natural gas is:
(A) Propane
(B) Ethane
(C) Butane
(D) Methane

28. The unit of molar concentration is:
(A) Molality
(B) Molarity (mol/L)
(C) Normality
(D) Mole fraction

29. Which of the following is used in dry cell batteries?
(A) Sodium
(B) Potassium
(C) Zinc
(D) Copper

30. Which type of reaction is the Haber process?
(A) Neutralization
(B) Oxidation
(C) Synthesis
(D) Decomposition

31. The monomer of polyethylene is:
(A) Ethylene
(B) Propylene
(C) Acetylene
(D) Butadiene

32. Which chemical is used to remove permanent hardness of water?
(A) Sodium carbonate
(B) Sodium chloride
(C) Potassium permanganate
(D) Aluminum hydroxide

33. The law of conservation of mass was given by:
(A) Avogadro
(B) Dalton
(C) Lavoisier
(D) Boyle

34. Which element is present in all organic compounds?
(A) Hydrogen
(B) Carbon
(C) Oxygen
(D) Nitrogen

35. The chemical name of common salt is:
(A) Sodium sulfate
(B) Sodium hydroxide
(C) Sodium chloride
(D) Sodium bicarbonate

36. The gas responsible for acid rain is:
(A) Carbon monoxide
(B) Sulfur dioxide
(C) Methane
(D) Hydrogen

37. Which acid is present in vinegar?
(A) Citric acid
(B) Acetic acid
(C) Formic acid
(D) Oxalic acid

38. The chemical formula of bleaching powder is:
(A) Ca(OCl)₂
(B) CaCl₂
(C) CaCO₃
(D) CaSO₄

39. Which gas is used in fire extinguishers?
(A) Carbon dioxide
(B) Oxygen
(C) Nitrogen
(D) Chlorine

40. Which one is an example of a thermosetting polymer?
(A) PVC
(B) Teflon
(C) Bakelite
(D) Polyethylene

41. The process of removing dissolved gases from water is called:
(A) Distillation
(B) Deaeration
(C) Filtration
(D) Sedimentation

42. The atomic number of oxygen is:
(A) 6
(B) 7
(C) 8
(D) 9

43. Which element is used as a moderator in nuclear reactors?
(A) Boron
(B) Graphite
(C) Lead
(D) Mercury

44. The chemical formula of gypsum is:
(A) CaSO₄·2H₂O
(B) CaCO₃
(C) CaCl₂
(D) Ca(OH)₂

45. The substance used in pencils is:
(A) Graphite
(B) Lead
(C) Carbon black
(D) Charcoal

46. Which type of reaction occurs in electrolysis of water?
(A) Combustion
(B) Decomposition
(C) Neutralization
(D) Synthesis

47. The main component of glass is:
(A) Calcium carbonate
(B) Sodium chloride
(C) Silica
(D) Alumina

48. Which acid is used in car batteries?
(A) Hydrochloric acid
(B) Nitric acid
(C) Sulfuric acid
(D) Phosphoric acid

49. The gas used in balloons is:
(A) Hydrogen
(B) Helium
(C) Nitrogen
(D) Oxygen

50. Which law is related to the volumes of reacting gases?
(A) Dalton’s Law
(B) Gay-Lussac’s Law
(C) Boyle’s Law
(D) Henry’s Law

Engineering Chemistry (Practice Test MCQs)

1. Basic/Foundation Subjects

2. Core Civil Engineering Subjects

3. Advanced/Applied Subjects

4. Management and Planning

5. Environmental & Sustainable Development