Mechanical Properties of Fluids Test

Result

Mechanical Properties of Fluids Test - 8

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Question 1
1 / -0

Pressure applied to an enclosed fluid is

A
Transmitted unchanged to every portion of the fluid and walls of the containing vessel

B
Diminished and transmitted to the wall of the container

C
Increased in proportion to the mass of the fluid and then transmitted

D
Increased and applied to every part of the fluid

Solution

According to Pascal's law (or the principle of transmission offluid-pressure) is a principle in fluid mechanics that states that apressure change occurring anywhere in a confined incompressiblefluid is transmitted throughout the fluid such that the same change occurs everywhere.
Question 2
1 / -0

A parrot is in a wire case, which is hanging from a spring balance. Initially the parrot sits in the cage and in the second instant the parrot flies inside the cage, the reading of the balance will be

A
Remain unchanged

B
Greater when the parrot flies in the cage

C
Lesser when the parrot flies in the cage

D
None of these

Solution

For the bird to stay in the air, the wings must push down on the air under them. If the cage is air tight, the air exerts an equal force on the floor of the cage. The net force down on the scale will remain constant. If the cage is not air tight (i.e; the wire cage), the air will move down and horizontal. The force down will be less than the weight of the bird.
Question 3
1 / -0

If there would be smaller gravitational effects, which of the following forces do you think would alter in some respect?

A
Nuclear forces

B
Electrostatic forces

C
Buoyant forces

D
Viscous forces

Solution

buoyancy force on an object is equal to the weight of the fluid displaced by the object, or the density of the fluid multiplied by the submerged volume times the gravitational acceleration.
Question 4
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If you float on your back on water, your weight is

A
Half to your normal weight

B
Greater than the weight of water you displace

C
Zero

D
Equal to your normal weight

Solution

Due to buoyant force of water, the buoyancy of water reduces your body weight by 90%.When you get into the pool, your body displaces a volume of water (the "hole" in the water that your body fits into). As long as your body displaces water weighs more than you do, you float.This is basically Archimedes' Law.You weigh less than the water you're in, because your lungs are full of air, like a balloon, and like a balloon, the air in your lungs lifts you to the surface naturally.