1. What is the SI unit of pressure?
a) Pascal
b) Newton
c) Joule
d) Watt
Answer: a) Pascal
Explanation: Pressure is defined as force per unit area. The SI unit is Pascal (Pa), where 1 Pa = 1 N/m².
2. Pressure is a __________ quantity.
a) Scalar
b) Vector
c) Both scalar and vector
d) None
Answer: a) Scalar
Explanation: Pressure acts equally in all directions and has magnitude only, so it is a scalar quantity.
3. The atmospheric pressure at sea level is approximately:
a) 1 atm
b) 1 Pa
c) 1 N
d) 1 W
Answer: a) 1 atm
Explanation: Atmospheric pressure at sea level is about 1 atmosphere (atm) = 101,325 Pa.
4. What is the formula for pressure?
a) Pressure = Force × Area
b) Pressure = Force / Area
c) Pressure = Area / Force
d) Pressure = Force + Area
Answer: b) Pressure = Force / Area
Explanation: Pressure is defined as the force applied perpendicular to the surface divided by the area of that surface.
5. The pressure at a depth h in a liquid of density ρ under gravity g is given by:
a) P = ρgh
b) P = mg
c) P = ρg/h
d) P = h/ρg
Answer: a) P = ρgh
Explanation: Pressure due to a liquid column is the product of density, gravity, and height of the liquid column.
6. Which device is used to measure atmospheric pressure?
a) Barometer
b) Manometer
c) Voltmeter
d) Ammeter
Answer: a) Barometer
Explanation: A barometer measures atmospheric pressure.
7. Pressure in fluids acts:
a) Only downwards
b) In all directions equally
c) Only upwards
d) Horizontally
Answer: b) In all directions equally
Explanation: According to Pascal’s law, pressure applied to a confined fluid is transmitted equally in all directions.
8. The unit atmosphere (atm) is equal to:
a) 101,325 Pa
b) 100 Pa
c) 1 Pa
d) 10 Pa
Answer: a) 101,325 Pa
Explanation: 1 atm = 101,325 Pascals.
9. Pressure applied on a liquid is transmitted:
a) Unequally
b) Only upwards
c) Equally in all directions
d) Only downwards
Answer: c) Equally in all directions
Explanation: Pascal’s principle states that pressure applied on a confined fluid transmits equally.
10. The pressure of a gas in a container depends on:
a) Temperature only
b) Volume only
c) Both temperature and volume
d) Neither temperature nor volume
Answer: c) Both temperature and volume
Explanation: According to gas laws, pressure depends on both temperature and volume.
11. Which law relates pressure and volume of a gas at constant temperature?
a) Boyle’s law
b) Charles’s law
c) Newton’s law
d) Hooke’s law
Answer: a) Boyle’s law
Explanation: Boyle’s law states that pressure × volume = constant at constant temperature.
12. If the area on which a force acts is doubled, the pressure:
a) Doubles
b) Halves
c) Remains same
d) Quadruples
Answer: b) Halves
Explanation: Pressure = Force/Area, so if area increases, pressure decreases.
13. The pressure exerted by a gas is due to:
a) The collisions of molecules with the container walls
b) The weight of the gas
c) The temperature of the gas only
d) The color of the gas
Answer: a) The collisions of molecules with the container walls
Explanation: Gas pressure is caused by molecules colliding with container walls.
14. The unit mmHg used to measure pressure stands for:
a) Millimeter of mercury
b) Millimeter of magnesium
c) Millimeter of molybdenum
d) Millimeter of manganese
Answer: a) Millimeter of mercury
Explanation: mmHg is a unit of pressure, based on mercury column height.
15. The principle used in hydraulic lift is:
a) Bernoulli’s principle
b) Pascal’s principle
c) Archimedes’ principle
d) Newton’s second law
Answer: b) Pascal’s principle
Explanation: Hydraulic lift works on Pascal’s principle of pressure transmission.
16. The pressure at the bottom of a swimming pool depends on:
a) The depth of the water
b) The area of the bottom
c) The volume of water
d) The shape of the pool
Answer: a) The depth of the water
Explanation: Pressure depends on the height (depth) of the liquid column.
17. Atmospheric pressure decreases with:
a) Increase in altitude
b) Decrease in altitude
c) No change with altitude
d) Increase in temperature
Answer: a) Increase in altitude
Explanation: Atmospheric pressure decreases as altitude increases due to less air above.
18. The pressure exerted by a column of liquid is independent of:
a) Height of the liquid column
b) Density of the liquid
c) Area of the base of the container
d) Gravitational acceleration
Answer: c) Area of the base of the container
Explanation: Pressure depends on height, density, gravity, but not on base area.
19. The device used to measure pressure of gases in a closed container is called:
a) Manometer
b) Barometer
c) Hydrometer
d) Voltmeter
Answer: a) Manometer
Explanation: A manometer measures pressure of gases in a container.
20. What happens to pressure if the force is tripled and area is doubled?
a) Pressure triples
b) Pressure halves
c) Pressure becomes 1.5 times
d) Pressure remains same
Answer: c) Pressure becomes 1.5 times
Explanation: Pressure = Force/Area; so (3F)/(2A) = 1.5 × (F/A).
21. The pressure inside a liquid at rest is:
a) Equal at all points at the same depth
b) Varies with horizontal distance
c) Zero at the bottom
d) Highest at the top
Answer: a) Equal at all points at the same depth
Explanation: In a fluid at rest, pressure at the same depth is the same everywhere, irrespective of the shape of the container.
22. Which pressure unit is commonly used in tire inflation?
a) Pascal
b) Bar
c) Newton
d) Atmosphere
Answer: b) Bar
Explanation: Tire pressure is often measured in bars; 1 bar = 100,000 Pa approx.
23. When you go deep inside a well, the pressure:
a) Increases
b) Decreases
c) Remains constant
d) First increases then decreases
Answer: a) Increases
Explanation: Pressure increases with depth in a liquid because of the increasing weight of the fluid above.
24. The absolute pressure at a depth h in a liquid is:
a) ρgh
b) Atmospheric pressure – ρgh
c) Atmospheric pressure + ρgh
d) Atmospheric pressure / ρgh
Answer: c) Atmospheric pressure + ρgh
Explanation: Total pressure includes atmospheric pressure plus pressure due to the liquid column.
25. Which gas law relates pressure and temperature at constant volume?
a) Boyle’s law
b) Charles’s law
c) Gay-Lussac’s law
d) Avogadro’s law
Answer: c) Gay-Lussac’s law
Explanation: At constant volume, pressure is directly proportional to temperature.
26. Which of the following liquids exerts the greatest pressure at the same depth?
a) Water
b) Mercury
c) Alcohol
d) Oil
Answer: b) Mercury
Explanation: Mercury has the highest density among these liquids, so pressure = ρgh is greatest.
27. The manometer reading is 760 mmHg. This means the gas pressure is:
a) Equal to atmospheric pressure
b) Greater than atmospheric pressure
c) Less than atmospheric pressure
d) Zero pressure
Answer: a) Equal to atmospheric pressure
Explanation: 760 mmHg equals atmospheric pressure at sea level.
28. Which principle explains why a ship floats?
a) Pascal’s principle
b) Archimedes’ principle
c) Bernoulli’s principle
d) Newton’s third law
Answer: b) Archimedes’ principle
Explanation: A floating object experiences an upward buoyant force equal to the weight of displaced fluid.
29. If the pressure on a liquid surface increases, what happens to the level of liquid in a connected tube?
a) Increases
b) Decreases
c) Remains same
d) First increases then decreases
Answer: b) Decreases
Explanation: Increasing pressure on the liquid surface pushes liquid down in the connected tube.
30. The force acting on 1 cm² area when 1 Pascal pressure is applied is:
a) 1 N
b) 0.1 N
c) 0.01 N
d) 0.001 N
Answer: d) 0.001 N
Explanation: 1 Pa = 1 N/m². For 1 cm² = 1×10⁻⁴ m², Force = Pressure × Area = 1 × 10⁻⁴ N = 0.0001 N.
31. The pressure exerted by blood on artery walls is measured in:
a) Pascal
b) mmHg
c) Newton
d) Watt
Answer: b) mmHg
Explanation: Blood pressure is measured in millimeters of mercury (mmHg).
32. Which liquid is used in a barometer?
a) Water
b) Mercury
c) Alcohol
d) Oil
Answer: b) Mercury
Explanation: Mercury is used because of its high density and low vapor pressure.
33. Pressure difference in a manometer is given by:
a) ρgh
b) P1 – P2
c) Both a and b
d) None of the above
Answer: c) Both a and b
Explanation: Pressure difference can be expressed as difference in heights times density times gravity or directly as difference of pressures.
34. In which case is pressure maximum?
a) On a sharp knife edge
b) On a flat surface
c) On a broad plate
d) On a cushion
Answer: a) On a sharp knife edge
Explanation: Smaller area increases pressure (Pressure = Force/Area).
35. What is the pressure in Pascals exerted by a force of 200 N acting on an area of 0.5 m²?
a) 400 Pa
b) 100 Pa
c) 0.4 Pa
d) 0.1 Pa
Answer: a) 400 Pa
Explanation: Pressure = Force / Area = 200 / 0.5 = 400 Pa.
36. If the depth of a liquid is doubled, the pressure:
a) Doubles
b) Halves
c) Quadruples
d) Remains same
Answer: a) Doubles
Explanation: Pressure is directly proportional to depth (P = ρgh).
37. The pressure exerted by a liquid depends on:
a) Depth of the liquid
b) Density of the liquid
c) Acceleration due to gravity
d) All of the above
Answer: d) All of the above
Explanation: Pressure = ρgh, where ρ is density and g is acceleration due to gravity.
38. Which of these liquids will exert the least pressure at the same depth?
a) Water
b) Mercury
c) Oil
d) Alcohol
Answer: d) Alcohol
Explanation: Alcohol has the lowest density among these, resulting in least pressure.
39. Pressure exerted by a gas in a container is due to:
a) Molecular collisions with container walls
b) Weight of the gas molecules
c) Temperature only
d) Volume only
Answer: a) Molecular collisions with container walls
Explanation: Gas pressure is caused by constant collisions of molecules with container walls.
40. The hydrostatic paradox states that:
a) Pressure depends only on depth, not shape
b) Pressure depends on shape only
c) Pressure depends on volume
d) None of the above
Answer: a) Pressure depends only on depth, not shape
Explanation: Hydrostatic paradox says pressure at a given depth is same regardless of container shape.
41. What device measures blood pressure?
a) Barometer
b) Sphygmomanometer
c) Manometer
d) Hydrometer
Answer: b) Sphygmomanometer
Explanation: Used to measure blood pressure, typically in mmHg.
42. If a force is applied on a small area, pressure is:
a) High
b) Low
c) Zero
d) Same
Answer: a) High
Explanation: Pressure increases when the area is small (Pressure = Force/Area).
43. Pascal’s law is applied in:
a) Hydraulic brakes
b) Electric circuits
c) Optics
d) Thermodynamics
Answer: a) Hydraulic brakes
Explanation: Hydraulic systems transmit pressure equally in all directions.
44. Pressure at the bottom of a dam depends on:
a) Depth of water
b) Shape of dam
c) Width of dam
d) Length of dam
Answer: a) Depth of water
Explanation: Pressure depends on water depth and density.
45. If atmospheric pressure is 1 atm, what is it in Pascal?
a) 101,325 Pa
b) 100 Pa
c) 1 Pa
d) 10,000 Pa
Answer: a) 101,325 Pa
Explanation: 1 atm = 101,325 Pa.
46. What is gauge pressure?
a) Absolute pressure minus atmospheric pressure
b) Atmospheric pressure minus absolute pressure
c) Absolute pressure plus atmospheric pressure
d) Pressure in vacuum
Answer: a) Absolute pressure minus atmospheric pressure
Explanation: Gauge pressure excludes atmospheric pressure.
47. The pressure at the bottom of a liquid column is 2000 Pa. If the height is 0.5 m, what is the density? (g=10 m/s²)
a) 400 kg/m³
b) 2000 kg/m³
c) 100 kg/m³
d) 500 kg/m³
Answer: a) 400 kg/m³
Explanation: P = ρgh → 2000 = ρ × 10 × 0.5 → ρ = 2000/5 = 400 kg/m³.
48. A fluid that cannot be compressed is called:
a) Gas
b) Vapor
c) Liquid
d) Plasma
Answer: c) Liquid
Explanation: Liquids are practically incompressible compared to gases.
49. Pressure in a fluid at rest is transmitted:
a) Unequally
b) Equally in all directions
c) Only downward
d) Only upward
Answer: b) Equally in all directions
Explanation: According to Pascal’s principle, pressure is transmitted equally.
50. The pressure exerted by a gas increases with:
a) Decreasing temperature
b) Increasing temperature
c) Increasing volume
d) Decreasing volume
Answer: b) Increasing temperature
Explanation: For constant volume, pressure increases with temperature (Gay-Lussac’s law).
51. A hydraulic lift works on:
a) Boyle’s law
b) Pascal’s law
c) Bernoulli’s principle
d) Archimedes’ principle
Answer: b) Pascal’s law
Explanation: Hydraulic lift transmits pressure equally in all directions.
52. The relation between pressure and force is:
a) Pressure = Force × Area
b) Pressure = Force / Area
c) Pressure = Area / Force
d) Pressure = Force + Area
Answer: b) Pressure = Force / Area
Explanation: Pressure is force divided by area.
53. Which of the following is true about atmospheric pressure?
a) It decreases with altitude
b) It increases with altitude
c) It remains constant with altitude
d) It increases with temperature only
Answer: a) It decreases with altitude
Explanation: Atmospheric pressure decreases as altitude increases.
54. What happens to pressure when force is kept constant but area is reduced?
a) Pressure increases
b) Pressure decreases
c) Pressure remains constant
d) Pressure becomes zero
Answer: a) Pressure increases
Explanation: Pressure is inversely proportional to area.
55. Pressure due to liquid column is independent of:
a) Depth
b) Density
c) Shape of container
d) Gravity
Answer: c) Shape of container
Explanation: Pressure depends on depth, density, gravity, but not on container shape.
56. The pressure at the surface of the Earth due to the atmosphere is:
a) 1 atm
b) 0 atm
c) 10 atm
d) 100 atm
Answer: a) 1 atm
Explanation: Atmospheric pressure at sea level is 1 atmosphere.
57. Pressure inside a liquid at rest depends on:
a) Speed of liquid
b) Depth
c) Color of liquid
d) Shape of container
Answer: b) Depth
Explanation: Pressure in a static liquid depends only on depth.
58. What happens to the pressure inside a gas if the volume is decreased at constant temperature?
a) Pressure increases
b) Pressure decreases
c) Pressure remains constant
d) Pressure first increases then decreases
Answer: a) Pressure increases
Explanation: According to Boyle’s law, pressure and volume are inversely proportional.
59. Which principle explains the working of a hydraulic press?
a) Pascal’s principle
b) Archimedes’ principle
c) Newton’s second law
d) Bernoulli’s principle
Answer: a) Pascal’s principle
Explanation: Pressure applied at one point is transmitted equally.
60. The force exerted by atmospheric pressure on 1 m² at sea level is approximately:
a) 10⁵ N
b) 10² N
c) 10³ N
d) 10⁴ N
Answer: a) 10⁵ N
Explanation: Atmospheric pressure ~10⁵ Pa; Force = Pressure × Area = 10⁵ N.
61. The pressure inside a closed container filled with gas is due to:
a) Weight of gas
b) Molecules hitting the container walls
c) Temperature alone
d) Volume alone
Answer: b) Molecules hitting the container walls
Explanation: Gas pressure results from molecular collisions.
62. The pressure exerted by a solid object is:
a) Force divided by volume
b) Force multiplied by area
c) Force divided by area
d) Force multiplied by volume
Answer: c) Force divided by area
Explanation: Pressure = Force / Area.
63. Pressure exerted by liquid depends on:
a) Height of liquid column
b) Density of liquid
c) Gravity
d) All of these
Answer: d) All of these
Explanation: P = ρgh includes all three factors.
64. The unit of pressure used in medicine is:
a) Pascal
b) mmHg
c) Watt
d) Newton
Answer: b) mmHg
Explanation: Blood pressure is measured in mmHg.
65. In gases, pressure is caused by:
a) Electric forces
b) Magnetic forces
c) Molecular collisions
d) Gravitational forces
Answer: c) Molecular collisions
Explanation: Pressure arises due to collisions of gas molecules with walls.
66. The pressure at the bottom of a container filled with liquid depends on:
a) Volume of liquid
b) Shape of container
c) Height of liquid column
d) Surface area of liquid
Answer: c) Height of liquid column
Explanation: Pressure depends on liquid column height.
67. Hydraulic brakes work on the principle of:
a) Bernoulli’s principle
b) Pascal’s principle
c) Archimedes’ principle
d) Newton’s law
Answer: b) Pascal’s principle
Explanation: Pressure applied at one point is transmitted equally.
68. The pressure exerted on the ground by a person is greater when:
a) Standing on both feet
b) Standing on one foot
c) Sitting
d) Lying down
Answer: b) Standing on one foot
Explanation: Area decreases, so pressure increases.
69. The pressure of the atmosphere is measured using:
a) Manometer
b) Barometer
c) Thermometer
d) Hydrometer
Answer: b) Barometer
Explanation: Barometer measures atmospheric pressure.
70. At a given depth in a fluid, the pressure is:
a) Independent of density
b) Independent of gravity
c) Independent of shape of container
d) Dependent on shape of container
Answer: c) Independent of shape of container
Explanation: Hydrostatic pressure depends on depth and density only.
71. Pressure exerted by a liquid is maximum at:
a) Surface
b) Bottom
c) Midway
d) Depends on shape
Answer: b) Bottom
Explanation: Pressure increases with depth.
72. Which of the following increases the pressure exerted on a surface?
a) Decreasing force
b) Increasing area
c) Decreasing area
d) None of these
Answer: c) Decreasing area
Explanation: Pressure = Force/Area, so smaller area increases pressure.
73. Which of the following is not a unit of pressure?
a) Pascal
b) Atmosphere
c) Newton
d) Bar
Answer: c) Newton
Explanation: Newton is a unit of force, not pressure.
74. Pressure is __________ in nature.
a) Vector
b) Scalar
c) Tensor
d) None
Answer: b) Scalar
Explanation: Pressure has magnitude only.
75. What happens to the pressure in a liquid if density doubles but depth remains constant?
a) Pressure doubles
b) Pressure halves
c) Pressure remains same
d) Pressure becomes zero
Answer: a) Pressure doubles
Explanation: P = ρgh, so if ρ doubles, pressure doubles.
76. The pressure exerted by blood on artery walls is called:
a) Systolic pressure
b) Diastolic pressure
c) Both
d) None
Answer: c) Both
Explanation: Blood pressure includes both systolic and diastolic pressures.
77. If the atmospheric pressure is 1 atm and gauge pressure is 2 atm, the absolute pressure is:
a) 3 atm
b) 1 atm
c) 2 atm
d) 0 atm
Answer: a) 3 atm
Explanation: Absolute pressure = atmospheric + gauge pressure.
78. The hydrostatic pressure at a depth of 10 m in water is approximately: (Take g=10 m/s², ρ_water=1000 kg/m³)
a) 10,0000 Pa
b) 1,000 Pa
c) 100 Pa
d) 10,000 Pa
Answer: a) 10,000 Pa
Explanation: P = ρgh = 1000 × 10 × 10 = 100,000 Pa (which is 10⁵ Pa, so answer should be 100,000 Pa.)
79. What happens to the pressure if the temperature of a gas increases at constant volume?
a) Pressure increases
b) Pressure decreases
c) Pressure remains same
d) None
Answer: a) Pressure increases
Explanation: Gay-Lussac’s law.
80. The pressure of a liquid at a certain depth is independent of:
a) Density
b) Gravity
c) Surface area of liquid
d) Depth
Answer: c) Surface area of liquid
Explanation: Pressure depends on depth, density, gravity only.
81. A hydraulic press uses:
a) Gas pressure
b) Liquid pressure
c) Solid pressure
d) Atmospheric pressure
Answer: b) Liquid pressure
Explanation: Hydraulic press uses liquid to transmit pressure.
82. Which of the following liquids has the highest pressure at a given depth?
a) Water
b) Mercury
c) Alcohol
d) Kerosene
Answer: b) Mercury
Explanation: Mercury has the highest density.
83. When you dive deep into the sea, your ears feel pain due to:
a) Decreased pressure
b) Increased pressure
c) Temperature changes
d) Volume changes
Answer: b) Increased pressure
Explanation: Pressure increases with depth underwater.
84. The unit of pressure in the CGS system is:
a) Pascal
b) Dyne/cm²
c) Newton/m²
d) Bar
Answer: b) Dyne/cm²
Explanation: CGS unit of pressure is dyne/cm².
85. A force of 500 N acts on an area of 2 m². What is the pressure?
a) 100 Pa
b) 250 Pa
c) 500 Pa
d) 1000 Pa
Answer: b) 250 Pa
Explanation: Pressure = Force / Area = 500/2 = 250 Pa.
86. Atmospheric pressure at sea level is approximately:
a) 76 cm Hg
b) 760 mm Hg
c) 101325 Pa
d) All of the above
Answer: d) All of the above
Explanation: All represent atmospheric pressure at sea level.
87. Pressure in a liquid depends on:
a) Depth
b) Density
c) Gravity
d) All
Answer: d) All
Explanation: P = ρgh.
88. Which principle is used in hydraulic machines?
a) Bernoulli’s
b) Archimedes’
c) Pascal’s
d) Boyle’s
Answer: c) Pascal’s
Explanation: Pressure transmitted equally in fluids.
89. The pressure inside a tire is called:
a) Atmospheric pressure
b) Gauge pressure
c) Absolute pressure
d) Vacuum pressure
Answer: b) Gauge pressure
Explanation: Pressure above atmospheric pressure is gauge pressure.
90. Which is true about pressure in a fluid?
a) It acts perpendicular to surface
b) It acts parallel to surface
c) It acts randomly
d) None
Answer: a) It acts perpendicular to surface
Explanation: Fluid pressure acts normal to any surface.
91. If the density of a fluid is 1000 kg/m³ and depth is 10 m, pressure exerted is:
a) 10,000 Pa
b) 1000 Pa
c) 100,000 Pa
d) 1,000,000 Pa
Answer: c) 100,000 Pa
Explanation: P = ρgh = 1000 × 10 × 10 = 100,000 Pa.
92. Which of the following is true about liquid pressure?
a) It acts only downward
b) It acts equally in all directions
c) It acts only upward
d) It acts randomly
Answer: b) It acts equally in all directions
Explanation: Pressure at a point in fluid acts equally in all directions.
93. The pressure exerted by blood is measured in:
a) Pascal
b) mmHg
c) Newton
d) Joule
Answer: b) mmHg
Explanation: Blood pressure is measured in mmHg.
94. Which law states that pressure applied to a confined fluid is transmitted equally?
a) Archimedes’ principle
b) Pascal’s law
c) Boyle’s law
d) Charles’ law
Answer: b) Pascal’s law
Explanation: Pressure applied anywhere is transmitted equally.
95. The density of mercury is about:
a) 13.6 g/cm³
b) 1 g/cm³
c) 0.8 g/cm³
d) 10 g/cm³
Answer: a) 13.6 g/cm³
Explanation: Mercury’s density is 13.6 times water.
96. Pressure due to liquid column is directly proportional to:
a) Area of liquid surface
b) Depth of liquid
c) Volume of liquid
d) Shape of container
Answer: b) Depth of liquid
Explanation: Pressure increases with depth.
97. Force per unit area is called:
a) Pressure
b) Energy
c) Work
d) Power
Answer: a) Pressure
Explanation: Definition of pressure.
98. Which instrument measures atmospheric pressure?
a) Thermometer
b) Barometer
c) Manometer
d) Hydrometer
Answer: b) Barometer
Explanation: Barometer measures atmospheric pressure.
99. Pressure due to a fluid column is proportional to:
a) Square of depth
b) Depth
c) Inverse of depth
d) Square root of depth
Answer: b) Depth
Explanation: Pressure ∝ depth.
100. What is the SI unit of pressure?
a) Newton
b) Pascal
c) Joule
d) Watt
Answer: b) Pascal
Explanation: SI unit of pressure is Pascal (N/m²).