9th Class Chemistry Second half Book Paper

Q1. Multiple choice questions (Attempt all · 60 × 0.5 = 30)

1. Which is/are responsible for acid rain?
   1. SO₂
   2. NO₂
   3. Both NO₂ and SO₂
   4. O₃
2. Combustion of methane produces:
   1. Carbon dioxide
   2. Water
   3. Heat
   4. All of these
3. What is eutrophication caused by?
   1. low phosphate concentration
   2. high concentration
   3. increase water flow
   4. improved water clarity
4. Standard form of 38000000000 is:
   1. 3.8×10⁸
   2. 3.8×10⁹
   3. 3.8×10¹²
   4. 3.8×10¹⁰
5. Which substance would have a higher rate of evaporation?
   1. water at 10 ºC
   2. water at 20 ºC
   3. water at 5 ºC
   4. water at 30 ºC
6. Meat and fish provide:
   1. Carbohydrates
   2. Proteins
   3. Lipids
   4. Sugar
7. Which gas turns lime water milky?
   1. ammonia
   2. carbon dioxide
   3. oxygen gas
   4. sulphur dioxide gas
8. CH3–CH2–CH3 is the chemical formula for:
   1. Ethane
   2. Propane
   3. Butane
   4. Pentane
9. The normal rain has pH:
   1. 5.6
   2. 6.5
   3. 4.6
   4. 4.2
10. Reduction of chloromethane gives:
    1. Hydrogen
    2. Chlorine
    3. Methane
    4. All of these
11. What is a commonly application of tap water in a chemistry laboratory?
    1. preparing chemical reagents
    2. calibration of sensors
    3. cleaning glasswater
    4. measuring pH level
12. 1 kilometer means:
    1. 100 m
    2. 1000 cm
    3. 1000 cm
    4. 1000 m
13. What happens to a liquid in an enclosed space during evaporation until saturation in reached:
    1. it solidifies
    2. it remains constant
    3. it evaporates completely
    4. it continues to vaporize
14. Which foods are rich in fats?
    1. Rice & maize
    2. Pulses & wheat
    3. Milk, egg & beans
    4. Cheese, butter & oil
15. Which gas turns starch iodide paper blue-black?
    1. ammonia
    2. carbon dioxide
    3. chlorine gas
    4. oxygen gas
16. Condensed structural formula for butane is:
    1. CH₃–CH₂–CH₃
    2. CH₃–CH₂–CH₂–CH₃
    3. CH₃–CH₂–CH₂–CH₂–CH₃
    4. CH₃–CH₃
17. What air pollution is released by forest fires and storms?
    1. Smoke
    2. Ash
    3. Methane
    4. Nitrogen oxides
18. Which product is obtained when chloromethane is reduced?
    1. Ethane
    2. Ethene
    3. Methane
    4. Ethyne
19. What process is used to purify water to produce distilled water?
    1. filtration
    2. distillation
    3. reverse osmosis
    4. sedimentation
20. Volume of liquid in cylinder is:
    1. 23
    2. 24
    3. 25
    4. 22
21. Which process involves the formation of stalagmites and stalactities in cave?
    1. filtration
    2. crystallization
    3. distillation
    4. evaporation
22. Disorder NOT caused by protein deficiency:
    1. Weight loss
    2. Muscle fatigue
    3. Loss of strength
    4. Constipation
23. Electrons of alkali metals excite by absorbing the light in:
    1. Visible wavelength
    2. UV wavelength
    3. IR wavelength
    4. Radio wavelength
24. The functional group of amines is:
    1. –OH
    2. –COOH
    3. –NH₂
    4. –CHO
25. Which is reddish brown gas?
    1. NO
    2. NO₂
    3. SO₂
    4. O₃
26. Which molecule contains a carbon–carbon single bond?
    1. Ethane
    2. Ethene
    3. Ethyne
    4. Methanol
27. What harmfull substances can wastewater carry?
    1. only minerals
    2. pathogens,bacteria
    3. pure water
    4. oxygen
28. SI unit of mass is:
    1. kilogram
    2. centimetre
    3. kelvin
    4. millimetre
29. What determine the formation of crystals during crystallization?
    1. temperature and pressure
    2. size of the container
    3. type os solvent used
    4. color of the solute
30. Nutrient that repairs body tissues:
    1. Carbohydrates
    2. Proteins
    3. Lipids
    4. Water
31. Which gas has a pungent smell similar to bleach?
    1. ammonia
    2. carbon dioxide
    3. chlorine gas
    4. hydrogen gas
32. The functional group is found in:
    1. Alcohols
    2. Ketones
    3. Carboxylic acids
    4. Esters
33. What air pollution is released by electrical discharge?
    1. Smoke
    2. Ash
    3. Methane
    4. Nitrogen oxides
34. By hydrogenation we mean the addition of:
    1. Hydrogen
    2. Water
    3. Halogen
    4. Hydrogen halide
35. What role do essential minerals in natural water play?
    1. they decreasen enzyme activity
    2. they provide necessary elements for biological processes
    3. they make water undrinkable
    4. they cause water to become more acidic
36. SI units are changed by factors of ten using:
    1. Prefixes
    2. Symbols
    3. Abbreviation
    4. Ratio
37. Which distilled product finds application in lead-acid batteries?
    1. crude oil
    2. distilled water
    3. essentail oil
    4. alcohol
38. Major function of carbohydrates includes:
    1. Storage
    2. Structural framework
    3. Defense system
    4. Messenger
39. Which gas is known to turn moist blue litmus paper red?
    1. ammonia
    2. carbon dioxide
    3. chlorine gas
    4. oxygen gas
40. In which of the following is an alcohol?
    1. CH₃–CH₂–O–CH₂–CH₃
    2. CH₃–CH₂–COOH
    3. C₆H₅–OH
    4. CH₃–CH₂–OH
41. Most air pollution is caused by:
    1. Ozone
    2. Acid rain
    3. Carbon monoxide
    4. The burning of fossil fuels
42. Where do fish and other marine life get their oxygen?
    1. From air bubbles
    2. From dissolved
    3. From food
    4. From sunlight
43. Standard form of 0.00000000034 is:
    1. 3.4×10⁻⁸
    2. 3.4×10⁻⁹
    3. 3.4×10⁻¹⁰
    4. 3.4×10⁻¹¹
44. What is another term for filtration by filter paper?
    1. vacuum filtration
    2. simple filtration
    3. gravity filtration
    4. buchner filtration
45. Foods with starch are important because:
    1. Strong bones
    2. Prevent obesity
    3. Easy to cook
    4. Give energy
46. The colour imparted by the flame of sodium metal is:
    1. Blue
    2. Green
    3. Golden yellow
    4. Purple
47. Which compound is not a saturated hydrocarbon?
    1. CH₃–CH₃
    2. CH₄
    3. CH₃–CH=CH₂
    4. CH₃–CH₂–CH₃
48. Which gas has the highest percentage in the air?
    1. O₂
    2. CO₂
    3. N₂
    4. O₃
49. What can household waste containing detergents do to aquatic life?
    1. improve water quality
    2. enhance fish growth
    3. cause the death of aquatic life
    4. increase water clarity
50. Instrument giving value close to actual is:
    1. Sensitivity
    2. Accuracy
    3. Precision
    4. Repeatability
51. What happens to the rate of evaporation when temperature inncrease?
    1. it decrease
    2. it remains constant
    3. it increases
    4. it depends on pressure
52. Bond between amino acids is called:
    1. Ionic bond
    2. Acidic bond
    3. Peptide bond
    4. Hydrogen bond
53. Which gas can be detection by its distinctive choking smell?
    1. ammonia
    2. carbon dioxide
    3. chlorine gas
    4. hydrogen gas
54. Ethanoic acid contains functional group:
    1. –OH
    2. –CO–
    3. –COOH
    4. –CHO
55. Chlorofluorocarbons are used in:
    1. solvant
    2. aerosols
    3. fridges
    4. all of these
56. What types of harmfull microbes can be found in natural water sources?
    1. only bacteria
    2. only viruses
    3. bacteria.viruses
    4. only parasites
57. One nanometer equals:
    1. 10⁻¹⁰ m
    2. 10⁻⁹ m
    3. 10⁻⁸ m
    4. 10⁻⁷ m
58. What observation confirms that crystallization is occuring in a saturated solution?
    1. the solution turns blue
    2. cloudiness and crystal formation
    3. bubbles from at the surface
    4. the solution become denser
59. Weak immunity due to lack of which nutrient?
    1. Amino acids
    2. Carbohydrates
    3. Proteins
    4. Lipids
60. Which guess turns the lime water, milky?
    1. Carbon monoxide
    2. Carbon dioxide
    3. Sulphur dioxide
    4. Oxygen