Physics
Hydraulic machines work on the principle of :
- Newton's first law
- Newton's third law
- Pascal's law
- both (a) and (b)
Fluids Pressure
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Answer
Pascal's law
Reason — The principle of a hydraulic machine is that a small force applied on a smaller piston is transmitted to produce a large force on the bigger piston. This principle is based on Pascal's law.
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Related Questions
The pressure P1 at the top of a dam and P2 at a depth h from the top inside water (density ρ) are related as:
- P1 > P2
- P1 = P2
- P1 - P2 = hρg
- P2 - P1 = hρg
The wall of a dam is made thicker at the bottom because :
- the pressure exerted by a liquid remains the same with its depth
- the pressure exerted by a liquid decreases with its depth
- the pressure exerted by a liquid increases with its depth
- of safety from outer forces.
Hydraulic machines act like a :
- force subtractor
- force reducer
- force multiplier
- both (a) and (c)
A rectangular cement block has length, breadth and height of 60 cm, 30 cm and 15 cm respectively. Identify the correct position of the block and pressure exerted by it on the ground.
- Minimum pressure is exerted when breadth and height form the base.
- Maximum pressure is exerted when breadth and height form the base.
- Maximum pressure is exerted when length and breadth form the base.
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