40 Questions
What is the SI unit of pressure?
Pascal
When fluids exert pressure on the base and walls of a container, where is this pressure transmitted?
Undiminished in all directions
Why does a ship made of iron and steel float in sea water while a sheet of iron and steel would sink?
Due to the buoyant force exerted by water
Which term is used to describe the upward force on an object immersed in a fluid?
Upthrust or buoyant force
How does an externally applied force balance the upward force on a bottle immersed in water?
By acting downwards and being at least equal to the difference between upward force and bottle weight
Why did Archimedes discover the principle named after him, according to the text?
He noticed the water in a bathtub overflowed when he stepped into it.
How did Archimedes determine the purity of the Archimedes gold made for the king?
By applying Archimedes’ principle.
Which device used in determining the density of liquids is based on Archimedes’ principle?
Hydrometer
In Archimedes’ principle, what force does a body experience when immersed in a fluid?
Upward force
How did Archimedes' understanding of mechanics help the Greek army in its war with the Roman army?
By applying principles of thrust and pressure
What is the SI unit of pressure?
Pascal
Why do truck or motorbus tires have much wider contact areas compared to regular car tires?
To decrease the pressure on the ground
How does the sharp edge of a cutting tool affect the pressure it exerts?
Increases pressure due to a smaller contact area
In which scenario does an object experience higher pressure: when a force is distributed over a larger area or a smaller area?
Smaller area
Why does a camel find it easier to run in a desert compared to other terrains?
Due to higher pressure exerted by its hooves on the sand
What is the SI unit for pressure?
Newton per square meter (N/m²)
If the thrust acting on an object is constant, what factor determines the pressure exerted?
The area over which the thrust acts
In the context of fluids, what is the pressure at a given depth proportional to?
The density of the fluid and the depth
If a rectangular wooden block with dimensions 20 cm × 10 cm is placed on a table, and the same block is then placed with dimensions 40 cm × 20 cm, which placement will exert more pressure on the table?
The 20 cm × 10 cm placement, as the thrust is concentrated on a smaller area
In the example of standing on loose sand versus lying down, what is the primary reason for the different effects observed?
The difference in the area over which the thrust acts in each case
What is the SI unit of pressure?
Pascal (Pa)
If a force acts on a smaller area, the pressure exerted will be:
Larger
Which of the following statements is true regarding the pressure exerted by a solid on a surface?
It is due to the weight of the solid
Why do nails have pointed tips, knives have sharp edges, and buildings have wide foundations?
To distribute the weight evenly over a larger area
In the context of pressure, what is the difference between solids and fluids?
Both solids and fluids exert pressure due to their weight
When a bottle is pushed deeper into water, the upward force exerted by the water ____________.
increases
In the scenario where an iron nail is placed on the surface of water in a beaker, the nail sinks due to ____________.
upward force exerted by the water
The fact that an iron nail sinks in water implies that the weight of the nail is ____________.
greater than the upthrust of water
When a bottle is released in water, it bounces back to the surface because ____________.
the upward force exceeds the downward gravitational force
When a stone is gradually lowered into water, the decrease in the elongation of the string or the reading on the spring balance is due to:
The upward force exerted by the water on the stone, known as the buoyant force
The difficulty in pushing a bottle deeper into water indicates an increase in ____________.
upthrust from water
The magnitude of the buoyant force experienced by a body immersed in a fluid depends on:
The volume of the body and the density of the fluid
The SI unit of pressure is ____________.
Pascal (Pa)
If two bodies of the same volume are immersed in the same fluid, the one with a higher density will experience:
A smaller buoyant force
What happens to the nail placed on the surface of water when it is pulled down by gravity?
It gradually sinks until fully immersed.
If a body is immersed in two different fluids with the same volume, the fluid with a higher density will exert:
A greater buoyant force on the body
Why does a bottle float when placed in water?
Because the upward thrust from water exceeds its weight.
If a body is subjected to a constant force, the pressure exerted by the body on a surface will be:
Inversely proportional to the area of the surface
What effect does the gravitational attraction of Earth have on the iron nail placed on the surface of water?
Pulls it downwards
What happens when an object is immersed in water?
An upward force is exerted on it by water
Test your knowledge on weight, force, and pressure with this quiz focused on situational examples involving sand, lying down, and fixing posters with drawing pins. Explore how these concepts interact in various scenarios.
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