1.
Pressure is equal to
Correct Answer
B. Force divided by area
Explanation
Pressure is defined as the force per unit area. In other words, pressure is the amount of force applied on a surface divided by the area over which the force is distributed. Therefore, the correct answer is "force divided by area".
2.
If you stand on your left foot and put your right foot down, the pressure on your left foot
Correct Answer
B. Decreases
Explanation
When you stand on your left foot and put your right foot down, the pressure on your left foot decreases. This is because when you put your right foot down, it transfers some of the weight and pressure from your left foot to your right foot. As a result, the pressure on your left foot is reduced.
3.
The SI unit of pressure is the
Correct Answer
B. Pascal
Explanation
The correct answer is pascal. The pascal is the SI unit of pressure. It is defined as one newton per square meter, which means it measures the force exerted on a surface area. The pascal is commonly used in scientific and engineering fields to quantify pressure, such as in fluid dynamics or atmospheric pressure measurements. Other units, such as the millibar, are also used to measure pressure, but the pascal is the standard SI unit.
4.
For a given weight, if the area of contact between two surfaces decreases, the pressure
Correct Answer
A. Increases
Explanation
When the area of contact between two surfaces decreases for a given weight, the pressure increases. This is because pressure is defined as the force applied per unit area. When the area of contact decreases, the same force is applied over a smaller area, resulting in a higher pressure.
5.
A pascal is
Correct Answer
C. 1 N/m2
Explanation
The correct answer is 1 N/m2 because a pascal is the SI unit of pressure, defined as one newton per square meter. It is commonly used to measure pressure in various fields such as physics and engineering.
6.
A tall thin glass and a wide short glass are each filled with the same amount of water. The pressure on the bottom of the tall thin glass is _________________the pressure on the bottom of the wide short glass.
Correct Answer
A. Greater than
Explanation
The pressure on the bottom of the tall thin glass is greater than the pressure on the bottom of the wide short glass because pressure is directly proportional to the height of the fluid column. The tall thin glass has a greater height of water, resulting in a greater pressure at the bottom.
7.
As you go deeper into a swimming pool, the pressure on your ears
Correct Answer
B. Increases
Explanation
As you go deeper into a swimming pool, the pressure on your ears increases. This is because water is denser than air, and as you descend, the weight of the water above you exerts more pressure. This increased pressure affects the air inside your ears, causing them to feel a greater force.
8.
When you stand shoulder-deep in the water in a lake, the pressure on your shoulders is ______________the pressure on your ankles.
Correct Answer
A. Less than
Explanation
When you stand shoulder-deep in the water in a lake, the pressure on your shoulders is less than the pressure on your ankles. This is because the pressure exerted by a fluid increases with depth. Since your shoulders are higher up in the water compared to your ankles, the depth is greater at your ankles, resulting in a greater pressure. Therefore, the pressure on your shoulders is less than the pressure on your ankles.
9.
A fluid is a any substance that has no definite _____.
Correct Answer
shape
Explanation
A fluid is a substance that has no definite shape. This means that it can flow and take the shape of its container. Unlike solids, which have a fixed shape, fluids are able to change their shape and conform to the shape of their surroundings. This property allows fluids to easily flow and move, making them useful in various applications such as transportation, plumbing, and hydraulics.
10.
A fluid also has the ability to __________.
Correct Answer
flow
Explanation
A fluid has the ability to flow because it can easily move and change shape when a force is applied. Unlike solids, fluids do not have a fixed shape and can take the shape of their container. This allows them to flow and move from one place to another.
11.
The pressure exerted by a fluid on a _________doesn't depend on the shape of the container.
Correct Answer
surface
Explanation
The pressure exerted by a fluid on a surface doesn't depend on the shape of the container because pressure is defined as force per unit area. The pressure exerted by a fluid is determined by the weight of the fluid above the surface and the area over which the force is distributed. The shape of the container does not affect the weight of the fluid or the area, so it does not have any impact on the pressure exerted on the surface.
12.
The atmosphere exerts a pressure of about _____at sea level
Correct Answer
C. 100,000 N
Explanation
The correct answer is 100,000 N. The atmosphere exerts a pressure of about 100,000 Newtons per square meter at sea level. This pressure is caused by the weight of the air above pushing down on the surface below.
13.
An instrument used to measure air pressure is a _______________.
Correct Answer
barameter
barometer
Explanation
The correct answer is "barometer". A barometer is an instrument used to measure air pressure. It is commonly used in weather forecasting to determine changes in atmospheric pressure, which can indicate upcoming weather conditions. The term "barameter" is likely a misspelling or typo, as the correct term is "barometer".
14.
Fluids at rest can exert ____________ that do useful work.
Correct Answer
force
Explanation
Fluids at rest can exert force that do useful work. When a fluid is at rest, it still possesses the ability to exert force on objects that come into contact with it. This force can be harnessed to perform work, such as pushing or lifting objects. For example, hydraulic systems utilize the force exerted by fluids at rest to transmit power and operate machinery. Therefore, the correct answer is force.
15.
Pushing on a fluid can increase ________________.
Correct Answer
pressure
Explanation
When a force is applied to a fluid, such as pushing on it, the particles within the fluid experience a change in momentum. This change in momentum causes the particles to collide with each other and the walls of the container, resulting in an increase in pressure. Therefore, pushing on a fluid can increase the pressure within it.
16.
The pressure the fluid exerts is _________________by the amount of the additional force being applied.
Correct Answer
increased
increase
Explanation
When an additional force is applied to a fluid, the pressure it exerts increases. This is because pressure is directly proportional to force, so as the force increases, the pressure also increases. Therefore, the correct answer is "increased, increase".
17.
_____________________is when a force is applied to a fluid in a closed container, the pressure throughout the fluid increases by the same amount.
Correct Answer
pascals principal
pascal's principal
Explanation
Pascal's principle, also known as Pascal's law, states that when a force is applied to a fluid in a closed container, the pressure throughout the fluid increases by the same amount. This principle is based on the fact that fluids are incompressible and transmit pressure uniformly in all directions. Therefore, any change in pressure applied to a fluid in a closed system will be distributed equally throughout the entire fluid.
18.
A _________________uses a fluid to increase an applied force.
Correct Answer
C. Hydraulic system
Explanation
A hydraulic system uses a fluid to increase an applied force. In this system, a liquid, usually oil, is used to transmit force from one point to another. The fluid is confined within a closed system and is pushed through pipes or tubes. When force is applied at one end, it is transmitted to another part of the system through the fluid, resulting in an increased force output. Hydraulic systems are commonly used in various applications such as car brakes, construction equipment, and aircraft landing gear.
19.
A fluid will move from a higher pressure environment to a __________pressure environment.
Correct Answer
C. Lower
Explanation
Fluids will always move from areas of higher pressure to areas of lower pressure. This is because fluids naturally flow from regions of high energy to regions of low energy. Therefore, in this case, the fluid will move from a higher pressure environment to a lower pressure environment.
20.
Wind can _________the rate at which smoke rises in a chimney.
Correct Answer
increase
Explanation
Wind can increase the rate at which smoke rises in a chimney because it creates air movement and pressure differences. When wind blows against the chimney, it creates a low-pressure area on one side, causing the air inside the chimney to be drawn out faster. This increased airflow helps to pull the smoke up the chimney more quickly, increasing the rate at which it rises.
21.
Hurricanes and other high winds can ______________the air pressure outside a house and the roof can be pushed off the house by the higher pressure of the still air inside.
Correct Answer
decrease
Explanation
Hurricanes and other high winds can cause a decrease in the air pressure outside a house. This decrease in air pressure can create a higher pressure of still air inside the house. The difference in pressure can exert a force on the roof, potentially pushing it off the house.
22.
Moving ______produces a force that allows planes and birds to fly.
Correct Answer
B. Air
Explanation
Moving air produces a force called lift, which allows planes and birds to fly. This lift force is generated due to the difference in air pressure above and below the wings or feathers. As the air moves faster over the curved upper surface of the wings, it creates lower pressure, while the slower-moving air below the wings creates higher pressure. This pressure difference generates lift, enabling the aircraft or bird to stay airborne.
23.
_______is created by downward flowing air which exerts an upward reaction force on the wing.
Correct Answer
lift
Explanation
Lift is the force that is generated by the downward flowing air as it passes over the wing of an aircraft. This air exerts an upward reaction force on the wing, which is known as lift. Lift is essential for an aircraft to overcome gravity and stay airborne. It is created by the shape of the wing, specifically the curved upper surface, which causes the air to move faster over the top and slower underneath. This difference in air speed creates a pressure difference, resulting in lift.
24.
Increasing the size or surface areas of the wing can __________lift.
Correct Answer
B. Increase
Explanation
Increasing the size or surface areas of the wing can increase lift. This is because a larger wing or increased surface area creates more lift-producing force due to increased air pressure difference between the upper and lower surfaces of the wing. This increased lift allows an aircraft to generate more upward force and counteract the force of gravity, enabling it to stay airborne or maneuver more effectively.
25.
Planes and birds have various wing ________depending on the type of flight.
Correct Answer
shapes
Explanation
Planes and birds have various wing shapes depending on the type of flight. This is because different wing shapes are optimized for different flight requirements. For example, birds that soar or glide typically have long, broad wings to generate lift and maintain stability. In contrast, birds that need to maneuver quickly, such as hummingbirds, have shorter, narrower wings for increased agility. Similarly, planes have different wing shapes depending on their intended purpose. For instance, commercial airliners have large, swept-back wings for efficient cruising, while fighter jets have smaller, more pointed wings for enhanced maneuverability.
26.
__________and gliders have long, narrow wings that help them glide long distances.
Correct Answer
A. Seabirds
Explanation
Seabirds have long, narrow wings that are specifically adapted for gliding long distances. This design allows them to catch air currents and soar effortlessly through the sky. Seabirds such as albatrosses and frigatebirds are known for their incredible ability to stay aloft for extended periods, using their wings to navigate vast oceanic expanses. Their streamlined wings reduce drag and provide lift, enabling them to cover great distances with minimal effort. This adaptation is crucial for their survival as they rely on gliding to search for food, migrate, and avoid predators.
27.
Swallows, swifts, falcons, and jet fighter airplanes have small, narrow, tapered wings to help them fly at
Correct Answer
B. High speeds
Explanation
Swallows, swifts, falcons, and jet fighter airplanes have small, narrow, tapered wings because they are designed for high speeds. These types of wings reduce drag and allow for efficient and streamlined movement through the air, which is essential for achieving and maintaining high speeds. The narrow shape also enhances maneuverability, enabling quick turns and agile flight. Therefore, the small, narrow, tapered wings of these birds and airplanes are specifically adapted to facilitate their ability to fly at high speeds.
28.
Mass=2000kg Acceleration=3.4 m/sec/sec Force?
Correct Answer
6800 N
6800N
6800n
Explanation
The force can be calculated using Newton's second law, which states that force is equal to mass multiplied by acceleration. In this case, the mass is given as 2000 kg and the acceleration is given as 3.4 m/sec/sec. Multiplying these values together gives a force of 6800 N.
29.
Mass=15kg Acceleration=12m/sec/sec Force ?
Correct Answer
180N
180 N
180n
Explanation
The force can be calculated using the formula F = m * a, where F is the force, m is the mass, and a is the acceleration. In this case, the given mass is 15 kg and the acceleration is 12 m/sec/sec. By substituting these values into the formula, we get F = 15 kg * 12 m/sec/sec = 180 N. Therefore, the correct answer is 180N.
30.
Mass=1kg Acceleration ? Force=0.1 N
Correct Answer
0.1 m/sec/sec
0.1 M/sec/sec
Explanation
The correct answer is 0.1 m/sec/sec, 0.1 M/sec/sec. This is because the force acting on an object is equal to the mass of the object multiplied by its acceleration. In this case, the force is given as 0.1 N and the mass is given as 1 kg. By rearranging the formula, we can calculate the acceleration as force divided by mass, which gives us 0.1 m/sec/sec. The answer also includes 0.1 M/sec/sec, which is the same value but written in a different unit format (capital M).
31.
Mass=3.8kg Acceleration ? Force=37.24 N
Correct Answer
9.8 M/sec/sec
9.8M/sec/sec
9.8 m/sec/sec
Explanation
The answer is 9.8 M/sec/sec, 9.8M/sec/sec, 9.8 m/sec/sec. This is because the unit for acceleration is meters per second squared (m/sec/sec). The given force of 37.24 N can be used to calculate the acceleration using Newton's second law of motion, which states that force is equal to mass multiplied by acceleration (F = ma). By rearranging the formula, we can calculate the acceleration as acceleration = force / mass. Substituting the given values, we get acceleration = 37.24 N / 3.8 kg = 9.8 m/sec/sec.
32.
Mass ? Acceleration=2 m/sec/sec Force=1 N
Correct Answer
o.5kg
0.5 kg
Explanation
The mass of an object can be calculated using the formula Force = Mass x Acceleration. In this case, the given force is 1 N and the acceleration is 2 m/sec/sec. By rearranging the formula, we can solve for mass: Mass = Force / Acceleration. Substituting the given values, we find that the mass is 0.5 kg. Therefore, the correct answer is 0.5 kg.
33.
Mass ? Acceleration=43 m/sec/sec Force=6536 N
Correct Answer
152kg
Explanation
The given information includes the values for acceleration (43 m/sec/sec) and force (6536 N). In order to find the mass, we can use Newton's second law of motion, which states that force is equal to mass multiplied by acceleration. By rearranging the formula, we can calculate the mass by dividing the force by the acceleration. Therefore, the mass is 152kg.
34.
No definite shape and can flow. Also can take shape of container.
Correct Answer
fluid
Fluid
Explanation
Fluid is the correct answer because it is a substance that has no definite shape and can flow. It can take the shape of its container, which means it can easily change its form and adapt to different environments. This characteristic distinguishes fluids from solids, which have a fixed shape and cannot flow. The repetition of the word "fluid" in the question and answer reinforces the idea that this is the correct answer.
35.
The amount of force applied per unit area on an object's surface measured in pascals
Correct Answer
pressure
Explanation
Pressure is defined as the amount of force applied per unit area on an object's surface. It is measured in pascals, which is the SI unit for pressure. Pressure can be calculated by dividing the force applied on an object by the area over which the force is distributed. This concept is important in various fields such as physics, engineering, and fluid mechanics, as it helps understand the behavior and interactions of objects under external forces.
36.
The upward force exerted by a fluid.
Correct Answer
bouyant force
Explanation
The upward force exerted by a fluid is called the buoyant force. This force is exerted on an object submerged in a fluid and is equal to the weight of the fluid displaced by the object. The buoyant force is what allows objects to float in a fluid, as it counteracts the force of gravity pulling the object downward. Therefore, the correct answer is buoyant force.
37.
The guyant force equals the weight of the fluid displaced by the object.
Correct Answer
archimede's principle
Archimede's principle
Explanation
The statement is referring to Archimedes' principle, which states that the buoyant force acting on an object submerged in a fluid is equal to the weight of the fluid displaced by the object. This principle explains why objects float or sink in a fluid based on their density.
38.
The pressure applied to a contained fluid is transmitted equally throughout the fluid.
Correct Answer
Pascal's principle
pascal's principle
pascal priciple
Explanation
Pascal's principle states that when pressure is applied to a fluid in a closed container, the pressure is transmitted equally throughout the fluid. This means that any change in pressure at one point in the fluid will be transmitted to all other points in the fluid. This principle is important in hydraulic systems, where a small force applied to a small area can be amplified to produce a larger force on a larger area. It also explains why a balloon filled with air expands uniformly in all directions when squeezed.
39.
Uses fluid to increase an applied force.
Correct Answer
hydralic system
hydraulic system
Explanation
The correct answer is "hydraulic system". A hydraulic system is a type of machinery that uses fluid to increase an applied force. It operates by transmitting force through the fluid, which is typically oil, and using that force to move or operate various components of the system. This technology is commonly used in various industries, such as construction, automotive, and aerospace, where a high amount of force needs to be generated and controlled efficiently.
40.
When the speed of a fluid increases the pressure exerted by the fluid decreases.
Correct Answer
bernoulli's principle
Explanation
Bernoulli's principle states that as the speed of a fluid increases, the pressure exerted by the fluid decreases. This principle is based on the conservation of energy, where an increase in fluid speed is accompanied by a decrease in fluid pressure. This can be observed in various situations, such as when air flows over an airplane wing, causing lift, or when water flows through a narrow pipe, causing the pressure to decrease. Therefore, Bernoulli's principle explains the relationship between fluid speed and pressure.