Pressure MCQs

 In this blog I am going to write the mcqs from lesson Pressure, that are know to must for SEE appearing candidates and preparing for Class 11 science entrance examination. For any confusion regarding the topics, you can contact or do leave the comments. Thank you.

1. Pressure is defined as:
   a) Force × Area
   b) Force / Area
   c) Area / Force
   d) Mass × Acceleration
2. The SI unit of pressure is:
   a) Newton (N)
   b) Joule (J)
   c) Pascal (Pa)
   d) Watt (W)
3. One Pascal (Pa) is equivalent to:
   a) 1 N/m²
   b) 1 N·m
   c) 1 kg/m ³
   d) 1 m/s²
4. Which of the following factors does pressure exerted by a solid depend on?
   a) Only the force applied
   b) Only the area of contact
   c) Both force applied and area of contact
   d) The volume of the solid
5. A sharp knife cuts objects more effectively than a blunt knife because:
   a) It applies more force
   b) It has a smaller contact area, hence greater pressure
   c) It has a larger contact area, hence greater pressure
   d) It is made of a harder material
6. The pressure exerted by a liquid at a certain depth depends on:
   a) The shape of the container
   b) The area of the base of the container
   c) The depth and density of the liquid
   d) The volume of the liquid
7. The formula for calculating pressure in a liquid is P = hρg. What does 'ρ' represent?
   a) Depth
   b) Density of the liquid
   c) Acceleration due to gravity
   d) Pressure
8. As you go deeper into a liquid, the pressure:
   a) Decreases
   b) Increases
   c) Remains constant
   d) First increases then decreases
9. Liquids exert pressure:
   a) Only downwards
   b) Only sideways
   c) Only upwards
   d) In all directions
10. The property of a liquid to seek its own level is due to:
    a) Its viscosity
    b) Its surface tension
    c) The pressure it exerts
    d) Its density
11. Atmospheric pressure is the pressure exerted by:
    a) The water vapour in the air
    b) The weight of the air column above a surface
    c) The dust particles in the air
    d) The ozone layer
12. The instrument used to measure atmospheric pressure is called a:
    a) Manometer
    b) Thermometer
    c) Barometer
    d) Hydrometer
13. Standard atmospheric pressure at sea level is approximately:
    a) 760 Pa
    b) 1013 Pa
    c) 760 mm of Hg
    d) 100 N/m²
14. As altitude increases, atmospheric pressure:
    a) Increases
    b) Decreases
    c) Remains constant
    d) Becomes zero
15. A drinking straw works on the principle of:
    a) Liquid pressure
    b) Atmospheric pressure
    c) Pascal's law
    d) Archimedes' principle
16. Pascal's Law states that pressure applied to an enclosed fluid is:
    a) Transmitted only downwards
    b) Transmitted equally in all directions
    c) Decreased as it is transmitted
    d) Absorbed by the walls of the container
17. Which of the following devices works on Pascal's Law?
    a) Siphon
    b) Hydraulic press
    c) Dropper
    d) Barometer
18. In a hydraulic press, if F1 and A1 are the force and area of the smaller piston, and F2 and A2 are for the larger piston, then:
    a) F1/A1 = F2/A2
    b) F1 × A1 = F2 × A2
    c) F1/A2 = F2/A1
    d) F1 × A2 = F2 × A1
19. The upward force exerted by a fluid on an object immersed in it is called:
    a) Gravitational force
    b) Frictional force
    c) Upthrust or Buoyant force
    d) Viscous force
20. Archimedes' Principle states that the upthrust on an object is equal to:
    a) The weight of the object
    b) The volume of the object
    c) The weight of the fluid displaced by the object
    d) The density of the fluid
21. An object will float in a liquid if:
    a) Its density is greater than the density of the liquid
    b) Its density is less than the density of the liquid
    c) Its density is equal to the density of the liquid
    d) Its weight is greater than the upthrust
22. An object will sink in a liquid if:
    a) Upthrust is greater than its weight
    b) Upthrust is equal to its weight
    c) Upthrust is less than its weight
    d) Its volume is very small
23. The Law of Floatation states that a floating body displaces a fluid whose weight is:
    a) Greater than its own weight
    b) Less than its own weight
    c) Equal to its own weight
    d) Equal to its own volume
24. A ship made of iron floats in water because:
    a) Iron is lighter than water
    b) The average density of the ship (including air) is less than water
    c) Water exerts no pressure on the ship
    d) The ship material is porous
25. The density of freshwater is approximately:
    a) 1 g/cm³
    b) 10 g/cm³
    c) 0.1 g/cm³
    d) 100 g/cm³
26. Why are the foundations of high-rise buildings made wide?
    a) To increase the pressure on the ground
    b) To decrease the pressure on the ground
    c) To make the building look good
    d) To save construction material
27. A camel can walk easily in a desert because:
    a) It has long legs
    b) It has broad feet, reducing pressure on the sand
    c) It stores water in its hump
    d) Sand is very compact
28. The unit 'bar' is commonly used to measure:
    a) Liquid pressure
    b) Solid pressure
    c) Atmospheric pressure
    d) Blood pressure
29. 1 atmosphere (atm) is approximately equal to:
    a) 1 Pa
    b) 100 Pa
    c) 101325 Pa
    d) 760 Pa
30. A fluid is a substance that:
    a) Can flow
    b) Has a fixed shape
    c) Is always a liquid
    d) Is always a gas
31. If the area of contact is doubled, keeping the force constant, the pressure will be:
    a) Doubled
    b) Halved
    c) Quadrupled
    d) Remain the same
32. The pressure at a point inside a liquid is independent of:
    a) Depth of the point
    b) Density of the liquid
    c) Acceleration due to gravity
    d) Area of the cross-section of the container
33. A sphygmomanometer is used to measure:
    a) Atmospheric pressure
    b) Blood pressure
    c) Liquid density
    d) Air humidity
34. Water from a dam is supplied to a town. The pressure of water in the taps will be higher:
    a) In houses at the top of a hill
    b) In houses at the bottom of a valley
    c) Same in all houses
    d) Depends on the pipe diameter only
35. Torricelli invented the:
    a) Hydraulic Press
    b) Siphon
    c) Mercury Barometer
    d) Submarine
36. If an object is partially or fully immersed in a fluid, it experiences an apparent loss in weight. This is due to:
    a) Surface tension
    b) Viscosity
    c) Upthrust
    d) Density of the object
37. The relative density of a substance is the ratio of its density to the density of:
    a) Air at 0°C
    b) Water at 4°C
    c) Mercury at 0°C
    d) Any standard liquid
38. A body floats with 1/3 of its volume outside the water. What is the density of the body if the density of water is 1000 kg/m ³?
    a) 333.3 kg/m ³
    b) 666.7 kg/m ³
    c) 1000 kg/m ³
    d) 1333.3 kg/m ³
39. Why does a nose bleed sometimes occur at high altitudes?
    a) Due to increased atmospheric pressure
    b) Due to decreased atmospheric pressure causing blood vessels to expand
    c) Due to low oxygen levels
    d) Due to cold temperature
40. The principle of a siphon relies on:
    a) Pascal's Law
    b) Difference in liquid pressure due to height and atmospheric pressure
    c) Archimedes' Principle
    d) Surface tension
41. If the force applied on a surface is 100 N and the area is 2 m², the pressure exerted is:
    a) 200 Pa
    b) 50 Pa
    c) 0.02 Pa
    d) 102 Pa
42. Which of the following exerts the least pressure on a surface if they all have the same weight?
    a) A pointed heel
    b) A flat shoe
    c) A single finger tip
    d) All exert equal pressure
43. When a suction pump is used to draw water, the water rises in the pipe because:
    a) The pump pushes the water up
    b) Atmospheric pressure pushes the water up into the low-pressure area created by the pump
    c) The water's own pressure makes it rise
    d) Gravity pulls the water up
44. Pressure exerted by a gas in a closed container is due to:
    a) The weight of the gas molecules
    b) The collisions of gas molecules with the walls of the container
    c) The attraction between gas molecules
    d) The volume of the gas molecules
45. The value of 'g' (acceleration due to gravity) used in P = hρg is approximately:
    a) 9.8 m/s²
    b) 1 N/kg
    c) Both a and b are numerically equivalent in this context
    d) 10 Pa
46. Two identical containers A and B are filled with water and mercury respectively to the same height. The pressure at the bottom will be:
    a) Greater in A
    b) Greater in B (since mercury is denser than water)
    c) Equal in both
    d) Cannot be determined
47. Hydraulic brakes in automobiles work on the principle of:
    a) Archimedes' Principle
    b) Newton's laws of motion
    c) Pascal's Law
    d) Law of Floatation
48. What happens to the upthrust on an object when it is taken from freshwater to saltwater? (Saltwater is denser than freshwater)
    a) Upthrust increases
    b) Upthrust decreases
    c) Upthrust remains the same
    d) Upthrust becomes zero
49. A force of 50 N is applied to a smaller piston of a hydraulic machine with an area of 0.1 m². If the larger piston has an area of 1 m², the force exerted by the larger piston is:
    a) 5 N
    b) 50 N
    c) 500 N
    d) 5000 N
50. Which of the following statements is INCORRECT regarding pressure in liquids?
    a) Pressure increases with depth.
    b) Pressure at the same depth is equal in all directions.
    c) Pressure depends on the shape of the container.
    d) Pressure is exerted on the walls of the container.

 

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