9th Class Chemistry Chapter no.5 MCQs
Unit no.5 MCQs of 9th Class Chemistry
Physical States of Matter:
1. How many times liquids are denser than gases?
a. 10,000 times
b. 100 times
c. 100,000 times
d. 1000 times
2. Gases are the lightest form of matter and their densities are expressed in terms of:
a. kgdm-3
b. mgcm-3
c. gdm-3
d. gcm-3
3. At freezing point which one of the following coexists in dynamic equilibrium?
a. Liquid and solid
b. Gas and solids
c. All of these
d. Liquid and gas
4. Solid particles possess which one of the following motions?
a. Translational motions
b. Rotational motions
c. Vibrational motions
d. Both B,C
5. Which one of the following gas diffuses fastest?
a. Chlorine
b. Hydrogen
c. Fluorine
d. Helium
6. Which one of the following does not affect the boiling point
a. Nature of liquids
b. Intermolecular forces
c. Initial temperature of liquid
d. External pressure
7. Density of a gas increases, when its:
a. Volume is kept constant
b. Temperature is increased
c. None of these
d. Pressure is increased
8. One atmospheric pressure is equal to how many pascals?
a. 106075
b. 101325
c. 10523
d. 10325
9. The gas which has higher rate of diffusion is:
a. Fluorine
b. Helium
c. Chlorine
d. Hydrogen
10. The simplest form of matter is:
a. Gas
b. Solid
c. Plasma
d. Liquid
11. Atmospheric pressure at sea level is:
a. 780 mm Hg
b. 760 mm Hg
c. 750 mm Hg
d. 700 mm Hg
12. Puncture of tyre is an example of:
a. Evaporation
b. Effusion
c. Condensation
d. Diffusion
13. Which of the following gas diffuse more rapidly?
a. Chlorine
b. Hydrogen
c. Fluorine
d. Helium
14. Gases can be compressed due to:
a. Molecules are closer to each other
b. No spaces between Gas molecules
c. Molecules has large size
d. More spaces between gas molecules
15. Instrument used to measure atmospheric pressure is:
a. Electrometer
b. Manometer
c. Unit meter
d. Barometer
16. Instrument used to measure pressure in laboratory is:
a. Manometer
b. Hydrometer
c. Barometer
d. Thermometer
17. Densities of gases are measured in:
a. gcm-3
b. gdm-3
c. mgdm-3
d. kgdm-3
18. The instrument used to find pressure in laboratories is:
a. Thermometer
b. Hydrometer
c. Galvanometer
d. Manometer
19. The unit of pressure is:
a. Ampere
b. Joule
c. Gram
d. Pascal
20. On what temperature the volume of gas becomes zero?
a. 73K
b. 273K
c. -2730C
d. 173K
21. One atmospheric pressure is equal to ……… torr:
a. 760
b. 101325
c. 10325
d. 765
22. The states of matter are:
a. Four
b. TOW
c. FIVE
d. THREE
23. Most of the matter exists in the form of:
a. Gas
b. Solids
c. Plasma
d. Liquids
24. The state of matter which does not have specific shape and volume is called
a. Gas
b. Solid
c. Plasma
d. Plasma
25. The inter molecular forces between the molecules of gases are:
a. Weak
b. Strong
c. Normal
d. Very strong
26. The inter molecular forces between the molecules of liquids are:
a. Weak
b. Strong
c. Normal
d. Very strong
27. Solids exist in ……… forms:
a. four
b. two
c. five
d. three
28. Rate of diffusion depends upon:
a. Volume
b. Molecular mass
c. Pressure
d. Density
29. The diffusion rate of hydrogen is ……… times faster than oxygen:
a. four
b. tow
c. five
d. three
30. Lighter gases diffuse:
a. Moderately
b. Rapidly
c. None
d. Slowly
31. The formula to find pressure is:
a. FT
b. AF
c. FP
d. FA
32. The SI unit of force is:
a. Kilogram
b. Pascal
c. Meter
d. Newton
33. The SI unit of area is:
a. Meter
b. Meter square
c. Kilometer
d. Meter cube
34. The SI unit of pressure is pascal, which is equal to:
a. Nm2
b. Nm
c. Nm-2
d. Nm-1
35. 1 mm of mercury is equal to:
a. 101325 torr
b. One torr
c. 760 torr
d. Two torr
36. Which of the following is a property of gases?
a. Diffusion
b. Compressibility
c. Mobility
d. All
37. Gases can be compressed due to …… between their molecules:
a. Smaller molecules
b. Empty spaces
c. High pressure
d. Bigger molecules
38. The kinetic energy of gas molecules is:
a. High
b. Less
c. Very high
d. Very less
39. Which state of matter possesses lowest density?
a. Gas
b. Solid
c. Plasma
d. Liquid
40. The densities of solids and liquids is measured in the units:
a. gdm-3
b. gdm3
c. gcm-3
d. gdm-3
41. The density of gases increases by:
a. Cooling
b. Heating
c. Evaporating
d. Boiling
42. The density of oxygen at 20 C temperature is:
a. 14gdm-3
b. 1.4gdm-3
c. 1.04gdm-3
d. 1.6gdm-3
43. The density of oxygen at 0 C temperature is:
a. 1.6gdm-3
b. 1.4gdm-3
c. 2.6gdm-3
d. 1.5gdm-3
44. In Charles law, k is equal to:
a. VT
b. TV
c. VP
d. TV
45. In SI, the unit of pressure is:
a. ms-1
b. NM
c. MS-2
d. NM-2
46. In Boyle’s law, the constant quantity is:
a. Temperature
b. Volume
c. Mass
d. Pressure
47. The value of absolute zero is:
a. 0°C
b. -273.15 °C
c. 100°C
d. 273.15°C
48. Robert Boyle presented his law of gases in:
a. 1662
b. 1762
c. 1665
d. 1862
49. According to Boyle’s law volume and pressure of a gas are ……… to each other:
a. Inversely proportional
b. Equal
c. Greater
d. Directly proportional
50. If we increase the pressure on the given gas enclosed in a container its volume:
a. Remains same
b. Increases
c. No change
d. Decreases
51. If we decrease the pressure on the given gas enclosed in a container its volume:
a. Remains same
b. Increases
c. No change
d. Decreases
52. The inventor of absolute temperature scale is:
a. Gold stein
b. Robert Boyle
c. Lord Kelvin
d. J. Charles
53. -273.15°C is equal to:
a. 100 K
b. 0 K
c. 50 K
d. 10K
54. In Charles law, the constant quantity is:
a. Volume
b. Temperature
c. Mass
d. Pressure
55. According to Charles law, the volume of a gas is ……… to the absolute temperature:
a. Inversely proportional
b. Equal
c. None
d. Directly proportional
56. J. Charles presented his law of gases in:
a. 1789
b. 1787
c. 1790
d. 1787
57. J. Charles belonged to:
a. Italy
b. Germany
c. France
d. England
58. The molecules of solids are ……… than liquids:
a. Smaller
b. Lighter
c. Bigger
d. Denser
59. The intermolecular forces between the molecules of gases is:
a. Very large
b. Smaller
c. None
d. Large
60. Formula to convert degree Celsius into Kelvin is:
a. K + 273
b. C + 273
c. K – 273
d. C – 273
61. In the evaporation process, liquid molecule which leave the surface of the liquid have:
a. Very high energy
b. Very low energy
c. None of these
d. Moderate energy
62. The vapour pressure of a liquid increases with the:
a. increase in inter molecular forces
b. increase in pressure
c. increase in polarity of molecules
d. increase in temperature
63. Freezing point of acetic acid is:
a. 16.6°C
b. 14.6°C
c. 17.6°C
d. 15.6°C
64. The speed of evaporation when we increase temperature:
a. Remains same
b. Increase
c. No change
d. Decrease
65. Density of water is:
a. 1.0dm-3
b. 1.0gcm-3
c. 1.0mg.cm-3
d. 1.0cm-3
66. Vapour pressure of water at 100°C is:
a. 580 mm Hg
b. 140 mm Hg
c. 760 mm Hg
d. 360 mm Hg
67. During evaporation, the molecules which escape out from liquid surface have:
a. Very high energy
b. Much less energy
c. No energy
d. Moderate energy value
68. Changing of a liquid into a gas is called:
a. Melting
b. Evaporation
c. Freezing
d. Condensation
69. When we convert 1 mole of water from liquid to gaseous state, ……… of energy is required:
a. 40.2 kJ
b. 40 kJ
c. 40.7 kJ
d. 40 kJ
70. The factors affecting the rate of evaporation are:
a. Four
b. Tow
c. Five
d. Three
71. The rate of evaporation is directly proportional to the:
a. Volume
b. Pressure
c. Force
d. Temperature
72. If we increase the temperature of a liquid, the rate of evaporation:
a. Remains same
b. Increases
c. No change
d. Decreases
73. If we decrease the temperature of a liquid, the rate of evaporation:
a. Remains same
b. Increases
c. No change
d. Decreases
74. If we increase the surface area of a liquid, the rate of evaporation:
a. Remains same
b. Increases
c. No change
d. Decreases
75. If we decrease the surface area of a liquid, the rate of evaporation:
a. Remains same
b. Increases
c. No change
d. Decreases
76. Evaporation is a ……… process:
a. Melting
b. Heating
c. Cooling
d. Freezing
77. The factors affecting the vapour pressure are:
a. Four
b. Tow
c. Five
d. Three
78. The liquid boils when the vapour pressure of the liquid becomes ……… the external pressure:
a. Equal
b. Greater
c. None
d. Less
79. Which of the following is crystalline solid?
a. Glass
b. Rubber
c. Glucose
d. Plastic
80. Density of aluminium is:
a. 2.6gcm-3
b. 2.4gcm-3
c. 2.7gcm-3
d. 2.5gcm-3
81. The density of iron is:
a. 5.01gcm-3
b. 7.86gcm-3
c. 10.2gcm-3
d. 7.06gcm-3
82. Which one of the following is not amorphous?
a. Glass
b. Rubber
c. Glucose
d. Plastic
83. ……… is an example of amorphous solid:
a. Plastic
b. Sodium chloride
c. Glucose
d. Diamond
84. The types of solids are:
a. Four
b. Tow
c. Five
d. Three
85. Amorphous means:
a. Powered
b. Bigger
c. smaller
d. Shapeless
86. An example of amorphous solid is:
a. Sugar
b. Diamond
c. Plastic
d. Sodium chloride
87. An example of crystalline solid is:
a. Rubber
b. Diamond
c. Glass
d. Plastic
88. The reasons of allotropy are:
a. Four
b. Tow
c. Five
d. Three
90. The transition temperature of sulphur is:
a. 100 oC
b. 96 oC
c. 102 oC
d. 98 oC
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