NEET Physics: Pascal's law and its applications Practice Questions
14 free multiple-choice questions on Pascal's law and its applications (Properties of Solids and Liquids) for NEET Physics, each with the correct answer and a step-by-step explanation. Attempt a question, then reveal the solution to check your reasoning.
Practice thousands more NEET questions in the app →Q1. In a hydraulic system, if a small input force is applied to a small piston, how is the output force determined for a larger piston?
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Correct answer: A — Output force is directly proportional to the ratio of areas
According to Pascal's principle, Pᵢₙ = Pₒᵤₜ, which means Fᵢₙ/Aᵢₙ = Fₒᵤₜ/Aₒᵤₜ. Therefore, Fₒᵤₜ = Fᵢₙ × (Aₒᵤₜ/Aᵢₙ). The output force is directly proportional to the ratio of the areas.
Q2. Pascal's law is fundamentally based on the principle that pressure applied to an enclosed fluid is:
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Correct answer: A — transmitted equally throughout the fluid.
The core concept of Pascal's law is that pressure applied at any point in a static fluid is transmitted equally and undiminished to every portion of the fluid and the walls of the containing vessel.
Q3. The principle behind hydraulic systems, such as hydraulic brakes, is directly based on which physical law?
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Correct answer: C — Pascal's law
Hydraulic systems operate based on Pascal's law, which dictates that pressure applied to an enclosed fluid is transmitted equally throughout the system.
Q4. Which of the following scenarios best illustrates the principle that pressure exerted by a fluid is transmitted equally in all directions?
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Correct answer: C — The pressure exerted by a liquid inside a sealed container.
Pascal's law specifically addresses the transmission of pressure equally in all directions within a fluid. A sealed container filled with a liquid is the classic example of this principle in action.
Q5. If a constant force is applied over a larger area, what happens to the pressure exerted on the fluid?
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Correct answer: C — Pressure decreases
Pressure (P) is defined as Force (F) divided by Area (A). If the force remains constant and the area increases, the resulting pressure will decrease (P = F/A).
Q6. In a hydraulic system, if a small force is applied to a small piston, the resulting large force in the other piston is achieved because:
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Correct answer: D — Pressure is transmitted equally
Pascal's law ensures that the pressure created by the small force is transmitted equally throughout the fluid, leading to a larger force on the larger area.
Q7. If the area of a piston is doubled while keeping the applied force constant, how will the resulting pressure change, assuming the fluid remains incompressible?
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Correct answer: D — It will be halved.
Since pressure P = F/A, if the force (F) is constant and the area (A) is doubled (A' = 2A), the new pressure P' = F/(2A) = P/2. Therefore, the pressure will be halved.
Q8. Pascal's law states that pressure applied to an enclosed fluid is transmitted equally in all directions. This principle is fundamental to the operation of hydraulic systems. What physical quantity remains constant throughout the system?
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Correct answer: D — Pressure
Pascal's law states that pressure is transmitted equally throughout the fluid. Since pressure is uniform across the system, it is the property that remains constant, regardless of how the force is distributed across the pistons.
Q9. The pressure exerted by a fluid at a certain depth is directly related to the height of the fluid column above that point. This principle is an application of which core concept?
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Correct answer: C — Pascal's Law
The relationship between pressure and depth (or height of fluid) is derived directly from the definition of pressure exerted by a fluid, which is fundamentally described by Pascal's law regarding fluid transmission.
Q10. Which statement correctly describes the relationship between force and pressure according to the formula P = F/A?
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Correct answer: C — Pressure is directly proportional to the force and inversely proportional to the area.
Pressure (P) is defined as the force (F) applied perpendicular to a surface divided by the area (A) over which the force is distributed, hence P = F/A.
Q11. Which of the following statements is a direct consequence of Pascal's law when dealing with liquids?
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Correct answer: B — Pressure is uniform throughout the fluid
The law mandates that the pressure remains uniform across the entire volume of the fluid, meaning the pressure is the same at every point within the liquid.
Q12. If the area of a piston is doubled in a hydraulic system while keeping the pressure constant, what happens to the output force produced?
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Correct answer: B — Output force is doubled
Since pressure (P = F/A) is constant, if the area (A) is doubled, the force (F) must also be doubled (F = P × A).
Q13. Pascal's law primarily describes the transmission of which physical quantity throughout a confined fluid?
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Correct answer: D — Pressure
Pascal's law states that the pressure applied to an enclosed fluid is transmitted undiminished to every point within the fluid and the walls of the containing vessel. Pressure is the key quantity transmitted.
Q14. If the area of a piston is doubled, assuming the pressure remains constant, how does the resulting force change?
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Correct answer: B — It is doubled
Since P = F/A, if P is constant, F ∝ A. If the area (A) is doubled, the force (F) must also be doubled.
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