MCQs Mastery: Chemistry for 10th Class & Job Prep (Sindh Textbooks)
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1. What are enzymes also called?
A) Proteins
B) Biocatalysts
C) Nucleotides
D) Antibodies
Correct Answer: B) Biocatalysts
2. What do fats increase in the body?
A) Oxygen level
B) Blood sugar level
C) Cholesterol level
D) Protein level
Correct Answer: C) Cholesterol level
3. What is the function of hemoglobin?
A) Transports carbon dioxide
B) Transports water
C) Transports oxygen
D) Transports fats
Correct Answer: C) Transports oxygen
4. What are nucleotides?
A) Monomers of proteins
B) Monomers of carbohydrates
C) Monomers of nucleic acid
D) Monomers of lipids
Correct Answer: C) Monomers of nucleic acid
5. What is DNA classified as?
A) Protein
B) Carbohydrate
C) Nucleic acid
D) Lipid
Correct Answer: C) Nucleic acid
6. What is the formula of ozone?
A) O
B) O2
C) O3
D) CO2
Correct Answer: C) O3
7. What causes ozone depletion?
A) Greenhouse gases
B) CFCs
C) Oxygen
D) Water vapor
Correct Answer: B) CFCs
8. What does greenhouse warming affect?
A) Ocean currents
B) Land temperature
C) Earth's surface
D) Atmospheric pressure
Correct Answer: C) Earth's surface
9. Which diseases are considered main waterborne diseases?
A) Influenza and pneumonia
B) Diarrhea and cholera
C) Tuberculosis and malaria
D) Diabetes and hypertension
Correct Answer: B) Diarrhea and cholera
10. What is the most abundant compound on Earth?
A) Oxygen
B) Nitrogen
C) Water
D) Carbon dioxide
Correct Answer: C) Water
11. What are the properties of petroleum?
A) Insoluble
B) Volatile
C) Solid
D) Non-reactive
Correct Answer: B) Volatile
12. At what temperature does water freeze?
A) 100°C
B) 0°C
C) -10°C
D) 50°C
Correct Answer: B) 0°C
13. What is petroleum classified as?
A) Simple hydrocarbon
B) Complex hydrocarbon
C) Oxygen compound
D) Inorganic compound
Correct Answer: B) Complex hydrocarbon
14. What is chlorine used for?
A) Food preservation
B) Killing pathogenic organisms
C) Water purification
D) Fuel production
Correct Answer: B) Killing pathogenic organisms
15. What is water with a low amount of soluble salt called?
A) Hard water
B) Saline water
C) Soft water
D) Brackish water
Correct Answer: C) Soft water
16. What are water paints also called?
A) Tempera
B) Oil paints
C) Acrylic paints
D) Distempers
Correct Answer: D) Distempers
17. What is potassium hydroxide also called?
A) Caustic soda
B) Caustic potash
C) Hydrochloric acid
D) Sulfuric acid
Correct Answer: B) Caustic potash
18. What is the formula for a saturated hydrocarbon?
A) C4H10
B) CH4
C) C2H6
D) C3H8
Correct Answer: A) C4H10
19. What does the prefix "hept" represent in organic chemistry?
A) 6 carbon atoms
B) 7 carbon atoms
C) 8 carbon atoms
D) 9 carbon atoms
Correct Answer: B) 7 carbon atoms
20. Which functional group is used for carboxylic acids?
A) OH
B) COOH
C) CO
D) NH2
Correct Answer: B) COOH
21. What is polyethylene classified as?
A) Metal
B) Plastic
C) Ceramic
D) Glass
Correct Answer: B) Plastic
22. Where is acetic acid obtained from?
A) Alcohol
B) Oil
C) Vinegar
D) Gasoline
Correct Answer: C) Vinegar
23. What is the general formula for Alkenes?
A) CnH2n
B) CnH2n+2
C) CnHn
D) CnH2n-2
Correct Answer: A) CnH2n
24. What is the general formula for Alkynes?
A) CnH2n
B) CnH2n+2
C) CnHn
D) CnH2n-2
Correct Answer: D) CnH2n-2
25. Which hydrocarbons are considered unsaturated?
A) Alkanes
B) Alkenes
C) Alkynes
D) Both B and C
Correct Answer: D) Both B and C
26. What is a hydrocarbon?
A) A compound of carbon, hydrogen, and oxygen
B) A compound of carbon and hydrogen only
C) A compound of hydrogen and oxygen only
D) A compound of carbon and oxygen only
Correct Answer: B) A compound of carbon and hydrogen only
27. Which compound is a member of the Alkyne family?
A) CH4
B) C2H4
C) C3H8
D) C2H2
Correct Answer: D) C2H2
28. What functional group represents Alkenes?
A) Single bond (C-C)
B) Triple bond (C≡C)
C) Double bond (C=C)
D) None of the above
Correct Answer: C) Double bond (C=C)
29. What remains constant at equilibrium?
A) Concentration of reactants only
B) Concentration of products only
C) Concentration of both reactants and products
D) Temperature only
Correct Answer: C) Concentration of both reactants and products
30. What causes corrosive effects on the skin?
A) Acids only
B) Bases only
C) Both acids and bases
D) Salts
Correct Answer: C) Both acids and bases
31. What are preservatives used for?
A) Enhancing flavor
B) Preserving food
C) Adding color
D) Increasing acidity
Correct Answer: B) Preserving food
32. What is CO2 classified as according to Arrhenius theory?
A) Acid
B) Base
C) Salt
D) None of the above
Correct Answer: D) None of the above
33. According to Lewis and Brønsted-Lowry theory, which compound is a base?
A) NH3
B) CO2
C) HCl
D) NaOH
Correct Answer: A) NH3
34. What is CN^- according to Lewis theory?
A) Acid
B) Base
C) Salt
D) None of the above
Correct Answer: B) Base
35. What is the pH value of a neutral solution?
A) 5
B) 7
C) 9
D) 12
Correct Answer: B) 7
36. When is a solution considered basic?
A) pH greater than 7
B) pH equal to 7
C) pH less than 7
D) pH equal to 14
Correct Answer: A) pH greater than 7
37. What is the pH value of an acidic solution?
A) Greater than 7
B) Less than 7
C) Equal to 7
D) Equal to 14
Correct Answer: B) Less than 7
38. What is KCl classified as?
A) Acid
B) Base
C) Salt
D) None of the above
Correct Answer: C) Salt
39. What is a substance called if it has both acidic and basic properties?
A) Monoprotic
B) Amphoteric
C) Neutral
D) Unreactive
Correct Answer: B) Amphoteric
40. What is the reaction of acid and base to form salt and water called?
A) Ionization
B) Dissociation
C) Neutralization
D) Oxidation
Correct Answer: C) Neutralization
41. What does organic chemistry primarily deal with?
A) Metals
B) Hydrocarbons and their derivatives
C) Acids
D) Gases
Correct Answer: B) Hydrocarbons and their derivatives
42. What is the general formula for alkane?
A) CnHn
B) CnH2n
C) CnH2n+2
D) CnH2n-2
Correct Answer: C) CnH2n+2
43. What is the nature of alkanes?
A) Saturated hydrocarbons
B) Unsaturated hydrocarbons
C) Aromatic compounds
D) Alcohols
Correct Answer: A) Saturated hydrocarbons
44. What is CH3OH classified as?
A) Acid
B) Base
C) Alcohol
D) Salt
Correct Answer: C) Alcohol
45. What pigment is used to produce white color?
A) Zinc oxide
B) Zinc sulfide
C) Titanium dioxide
D) Calcium carbonate
Correct Answer: B) Zinc sulfide
46. How much pure is blister copper?
A) 95%
B) 98%
C) 99%
D) 100%
Correct Answer: B) 98%
47. What type of isomerism does iso-butane possess?
A) Position isomerism
B) Chain isomerism
C) Functional isomerism
D) Stereoisomerism
Correct Answer: B) Chain isomerism
48. What are hydrocarbons with double bonds in their molecules called?
A) Alkanes
B) Alkenes
C) Alkynes
D) Aromatics
Correct Answer: B) Alkenes
49. How many isomers does butane have?
A) 1
B) 2
C) 3
D) 4
Correct Answer: B) 2
50. What is an example of dehydration?
A) Preparation of ethane from ethyl alcohol
B) Preparation of ethyl alcohol from ethane
C) Preparation of propane from propylene
D) Preparation of ethylene from ethanol
Correct Answer: A) Preparation of ethane from ethyl alcohol
51. What is the process of passing radiation through any substance called?
A) Emission
B) Absorption
C) Irradiation
D) Reflection
Correct Answer: C) Irradiation
52. What does beeswax maintain?
A) Hardness and color
B) Softness and shine
C) Flexibility and texture
D) Transparency and gloss
Correct Answer: B) Softness and shine
53. What is used in inks to make them more durable?
A) Talc
B) Gum Arabic
C) Shellac
D) Linseed oil
Correct Answer: B) Gum Arabic
54. What does the removal of moisture control?
A) Growth of bacteria
B) Growth of viruses
C) Growth of fungi
D) Growth of microorganisms
Correct Answer: D) Growth of microorganisms
55. What is another term for chemical equilibrium?
A) Static equilibrium
B) Dynamic equilibrium
C) Steady state
D) Reaction completion
Correct Answer: B) Dynamic equilibrium
56. What is heavy water used as in nuclear reactors?
A) Catalyst
B) Moderator
C) Fuel
D) Shielding material
Correct Answer: B) Moderator
57. What is the electronegativity value of hydrogen?
A) 1.0
B) 2.1
C) 3.0
D) 4.0
Correct Answer: B) 2.1
58. What is the maximum density of water at 4°C?
A) 0.5 g/cm³
B) 1.0 g/cm³
C) 1.5 g/cm³
D) 2.0 g/cm³
Correct Answer: B) 1.0 g/cm³
59. What is the freezing point of heavy water?
A) 0°C
B) 1°C
C) 3.81°C
D) 5°C
Correct Answer: C) 3.81°C
60. Who proved in 1775 that diamond is an allotropic form of carbon?
A) Rutherford
B) Lavoisier
C) Dalton
D) Mendeleev
Correct Answer: B) Lavoisier
61. What is the usual shape of diamond crystals?
A) Cubic
B) Octahedral
C) Tetrahedral
D) Dodecahedral
Correct Answer: B) Octahedral
62. What is the atomic number of carbon?
A) 4
B) 6
C) 8
D) 12
Correct Answer: B) 6
63. Where does carbon rank in terms of abundance in the earth's crust?
A) 5th
B) 10th
C) 18th
D) 25th
Correct Answer: C) 18th
64. What is the most common carbonate rock?
A) NaCO3
B) CaO
C) CaCO3
D) MgCO3
Correct Answer: C) CaCO3
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