SPSC Lecturer of chemistry past papers Solved
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1. The reason for chlorinating water is
a) To propagate germs
b) To add taste
c) To add minerals
d) To kill germs
2. Cooling of vapors of some compounds changes them directly into solid-state. This phenomenon is called
a) Sublimation
b) Evaporation
c) Condensation
d) Crystallization
3. The carbonated drink is an example of
a) Gas in gas
b) Gas in water
c) Gas in solid
d) Solid in liquid
4. Smoke is a solution to
a) Solid in solid
b) Solid in gas
c) Solid in liquid
d) Gas in gas
5. Fog is a solution to
a) Gas in gas
b) Gas in liquid
c) Liquid in gas
d) Liquid in liquid
6. The common battery used in automobiles is
a) Iron storage battery
b)Copper storage battery
c)Lead storage battery
d) silver storage battery
7. which acid is present in sour milk
a) citric acid
b) tartaric acid
c) lactic acid
d) formic acid
8. The water that can produce good lather with soap is known as
a) soft water
b) hard water
c) heavy water
d) atomic water
9. Which of the following is the purest form of carbon
a) diamond
b) graphite
c) buckyballs
d) marble
10. The glitter of the diamond is
a) because it is transparent
b) because it is non-conductor
c) due to its quality of reflecting light
d) because it is its density
11. In colorful diamond different colors are present due to
a) impurities
b) angular bonds between carbon atoms
c) different patterns of the carbon chain
d) none
12. All of the following are different uses od hydrogen peroxide except
a) used as bleaching agents
b) used to deodar sewers
c) used as fuel in space
d) used to prepare organic peroxide
13. Ozone is present in which of the following layers of the atmosphere
a) troposphere and thermosphere
b) troposphere and stratosphere
c) mesosphere
d) thermosphere
14. Methane is used in daily life with the name of
a) Carbon dioxide
b) Natural gas
c) Carbon mono oxide
d) None
15. When electricity is passed through neon it glows
a) Blue
b) Green
c) Red
d) Yellow
16. Argon and which gas is used in various type of fluorescent and photo lubes
a) Oxygen
b) Helium
c) Neon
d) krypton
17. Enzymes are
a) chemical catalyst
b) biological catalyst
c) organic catalyst
d) inorganic catalyst
18. The atomic weight of uranium
a) 237
b) 238
c) 226
d) 242
19. Which among the following is in the liquid state in room temperature
a) Mercury
b) Sodium
c) Phosphorous
d) None
20. Which of the following gases is used in cigarette lighters
a) Butane
b) Methane
c) Propane
d) Radon
21. LPG consist of
a) Butane and propane
b) Ethane and hexane
c) Ethane and nonane
d) None
22. Which of the following is fire resistant
a) Asbestos
b) Gypsum
c) Dolomite
d) None
23. Which of the following is used for silvering of mirrors
a) silver nitrate
b) zinc nitrate
c) silver oxide
d) none
24. Raw materials used for manufacturing of glass
a) sand /soda /limestone
b) sand/charcoal/soda
c) limestone/charcoal/Sulphur
d) AB
25. Solder is an alloy of
a) Tin and lead
b) Tin and zinc
c) Zinc and copper
d) Zinc & lead
26. Why does milk curdle
a) Fermentation of lactose
b) Reaction of microbes
c) Overheating
d) Fungus growth
27. Which of the following is the lightest gas
a) Nitrogen
b) Hydrogen
c) Ammonia
d) Carbon dioxide
28. Which one of the following does not wet the walls of the glass vessels in which it is kept
a) Water
b) Alcohol
c) Mercury
d) none
29. Dialysis is used for people with defective the kidneys it involves the process of
a) adsorption
b) osmoses
c) diffusion
d) electro freesias
30. The substances coated with plastic tape
a) zinc oxide
b) iron oxide
c) manganese oxide
d) iron sulfate
31. which form of phosphorus is used in safety match
a) red phosphorus
b) white phosphorus
c) yellow phosphorus
d) black phosphorus
32. The permanent hardness of water can be removed by adding
a) potassium permanganate
b) chlorine
c) bleaching powder
d) washing soda
33. The first synthetic fiber made by men
a) rayon
b) nylon
c) polestar
d) terrycoll
34. Gypsum is added to cement clinker to
a) increase the tensile strength of cement
b) Bind the particles of calcium silicate
c) Decrease the rate of setting of cement
d) None
35. Production of (CFC) chlorofluorocarbons is used in which Of the following domestic products
a) Television
b) Tube light
c) Cooking gas
d) refregater
36. In fireworks, the green flame is produced because
a) Mercury
b) Sodium
c) Potassium
d) barium
37. The mixture of two material is called
a) Desperation
b) Alloy
c) Mouse
d) Hard drive
38. Dynamite discovers by
a) Daimler
b) Mosley
c) Natural gas
d) Alford Nobel
e) Freud
39. Which of the following gas is used for fire extinguishers
a) Oxygen
b) Hydrogen
c) Water vapor
d) Carbon dioxide
40. Stains of rust from iron on cloth can be removed by
a) Hydrogen peroxide
b) Alcohol
c) Oxalic acid
d) petrol
41. cooking gas is a mixture of following two gasses
a) Methane and carbon dioxide
b) Oxygen
c) Nitrogen
d) Oxygen and methane
42. Addition of salt to the water, its
a) Boiling point increase
b) Boiling point decrease
c) Boiling point not effect
d) freezing point increase
43. Which of the following gas not pollute the air
a) Carbon dioxide
b) Nitrogen dioxide
c) Carbon monoxide
d) Sulfur dioxide
44. The inorganic natural resource of the earth is
a) Minerals fuels
b) Wood
c) Coal
d) Microbes
45. Which one of the highest value of fule
a) Hydrogen
b) Charcoal
c) Natural gas
d) Gasoline