Disaster And Failure Final

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  • 1/100 Questions

    A hypothesis is

    • Plan
    • Fact
    • Theory
    • Law of nature
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About This Quiz

The 'Disaster and Failure Final' quiz evaluates knowledge on structural engineering, focusing on bridge design and the impact of disasters like the Tay Bridge Disaster. It covers material choices, bridge types, and critical safety considerations, essential for aspiring engineers.

Disaster And Failure Final - Quiz

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  • 2. 

    In testing a hypothesis, if discrepancies between the tests and hypothesis occur one may have too... 

    • Modify the hypothesis to account for the new behavior discovered in testing

    • Abandon the hypothesis for being wrong

    • Use a different set of test for the hypothesis

    • Ignore the data not fitting the hypothesis

    Correct Answer
    A. Modify the hypothesis to account for the new behavior discovered in testing
    Explanation
    When discrepancies between the tests and hypothesis occur, it indicates that the hypothesis may not fully explain the observed behavior. Therefore, it is necessary to modify the hypothesis to incorporate the new behavior discovered during testing. This allows for a more accurate and comprehensive understanding of the phenomenon being studied.

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  • 3. 

    The apollo 13 accident started with 

    • Capsule tiles loosened during liftoff

    • Human error during a guidance maneuver

    • Loss of battery power in the lunar module

    • The explosion of 1 of 2 oxygen tanks

    Correct Answer
    A. The explosion of 1 of 2 oxygen tanks
    Explanation
    The correct answer is the explosion of 1 of 2 oxygen tanks. This event led to a series of issues and failures in the Apollo 13 mission. The explosion caused a loss of critical life support systems, including the main power supply and the ability to generate breathable air. It also damaged the spacecraft's propulsion system, making it impossible to continue the mission to the moon. The crew had to rely on backup systems and the lunar module as a lifeboat to safely return to Earth.

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  • 4. 

    Prior to the use of shuttles, American astronauts were recovered using which technique

    • Flying a capsule to Edwards AFB

    • Parachuting a capsule to an ocean landing

    • Parachuting a capsule onto land

    • Parachuting a capsule onto an aircraft carrier

    Correct Answer
    A. Parachuting a capsule to an ocean landing
    Explanation
    Prior to the use of shuttles, American astronauts were recovered by parachuting a capsule to an ocean landing. This technique involved the use of a capsule that would descend through the Earth's atmosphere and land in the ocean with the help of parachutes. This method allowed for a controlled landing and ensured the safety of the astronauts. The capsule would then be retrieved by a recovery team and the astronauts would be brought back to land. This technique was used before the development of shuttles, which provided a different method of returning astronauts to Earth.

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  • 5. 

    The major factor contributing to the Apollo 1 disaster was? 

    • The bulkiness of the space suits then in use

    • The lack of available fire fighters

    • The use of pure 02 capsule environment

    • Overconfidence on the part of astronauts

    Correct Answer
    A. The use of pure 02 capsule environment
    Explanation
    The major factor contributing to the Apollo 1 disaster was the use of a pure oxygen (O2) capsule environment. This created a highly flammable atmosphere inside the spacecraft. During a pre-launch test, a spark ignited a fire, which quickly spread due to the high concentration of oxygen. The astronauts were unable to escape as the fire rapidly consumed the cabin. This tragedy led to significant changes in the design and safety protocols of future space missions.

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  • 6. 

    The space shuttle has proven to be.... 

    • Dangerous

    • Difficult to operate

    • Too limited in its capacity and range

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The correct answer is "all of the above" because the statement "The space shuttle has proven to be dangerous" is true, as there have been accidents and fatalities associated with space shuttle missions. Additionally, the statement "The space shuttle has proven to be difficult to operate" is also true, as operating a space shuttle requires extensive training and expertise. Lastly, the statement "The space shuttle has proven to be too limited in its capacity and range" is also true, as the space shuttle had limitations in terms of payload capacity and the distance it could travel.

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  • 7. 

    The primary obstacle to implementing a hydrogen grid is? 

    • Lack of technological capability

    • High cost

    • Large size of individual home units

    • Resistance by environmentalists

    Correct Answer
    A. High cost
    Explanation
    The primary obstacle to implementing a hydrogen grid is the high cost. This means that the expenses associated with setting up and maintaining a hydrogen grid infrastructure are significant and may be prohibitive for widespread implementation. The cost includes factors such as production, storage, transportation, and distribution of hydrogen. These expenses may make it difficult for governments, organizations, and individuals to invest in and adopt hydrogen grid systems, hindering their implementation and development.

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  • 8. 

    The major challenge with heavier than airplanes is their inherent.... 

    • Inefficiency due to all the lift required

    • Dangers of flying so high

    • Requirement for long runways

    • Noise pollution over populated areas

    Correct Answer
    A. Inefficiency due to all the lift required
    Explanation
    Heavier than airplanes face a major challenge due to their inherent inefficiency caused by the need for a significant amount of lift. This means that they require more power and fuel to generate the necessary lift, resulting in reduced fuel efficiency and higher operating costs. Additionally, the increased weight requires stronger and more expensive materials for construction. Overall, the inefficiency in generating lift poses a significant challenge for heavier than airplanes.

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  • 9. 

    To design and build a safe bridge, an engineer must understand all of the following except

    • The forces caused by things that interact with the bridge

    • How the materials will react to the forces over the life of the bridge

    • The force of gravity

    • Aesthetically pleasing architecture

    Correct Answer
    A. Aesthetically pleasing architecture
    Explanation
    To design and build a safe bridge, an engineer must understand the forces caused by things that interact with the bridge, how the materials will react to the forces over the life of the bridge, and the force of gravity. However, the engineer does not need to have knowledge of aesthetically pleasing architecture in order to ensure the safety of the bridge. Aesthetically pleasing architecture is more related to the visual appeal and design of the bridge, which although important, is not directly related to its structural integrity and safety.

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  • 10. 

    Which of the following is NOT a category of knowledge gained by studying disasters according to our class notes?

    • How we build things

    • The quality of our technical education system

    • Our understanding of science

    • Insight into ourselves

    Correct Answer
    A. The quality of our technical education system
    Explanation
    The correct answer is "the quality of our technical education system". This is not a category of knowledge gained by studying disasters according to our class notes. The other options, "how we build things", "our understanding of science", and "insight into ourselves", are all mentioned as categories of knowledge gained by studying disasters in our class notes.

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  • 11. 

    A suspicious coin comes up head 70 times in 100 flips. What is a good estimate for the probability of heads occuring

    • 30%

    • 50%

    • 70%

    • Can't decide on the basis of the data provided

    Correct Answer
    A. 70%
    Explanation
    Based on the data provided, where the coin came up heads 70 times out of 100 flips, a good estimate for the probability of heads occurring would be 70%. This is because the number of heads (70) is close to the total number of flips (100), suggesting that the coin is biased towards landing on heads.

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  • 12. 

    For normally distributed values, approximately how many fall within 1 standard deviation of the mean

    • 68%

    • 80%

    • 95%

    • 99%

    Correct Answer
    A. 68%
    Explanation
    Approximately 68% of normally distributed values fall within 1 standard deviation of the mean. This is because in a normal distribution, about 68% of the data lies within one standard deviation of the mean in both directions. Therefore, the correct answer is 68%.

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  • 13. 

    If there is a 5% chance of some event occurring, then the probability of occurrence is... 

    • 5

    • .5

    • .05

    • .005

    Correct Answer
    A. .05
    Explanation
    The probability of an event occurring is typically represented as a decimal or fraction between 0 and 1. In this case, the given answer of .05 represents a 5% chance, which is equivalent to 5/100 or 1/20.

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  • 14. 

    The movie Apollo 13.... 

    • Erroneously shows the crew circling the moon

    • Is fairly accurate in depicting actual events

    • Fails to show the ground crew incompetence

    • Hints of sabotage by Earth day advocates

    Correct Answer
    A. Is fairly accurate in depicting actual events
    Explanation
    The correct answer is "fairly accurate in depicting actual events." This means that the movie Apollo 13 is mostly true to the real-life events that occurred during the mission. While there may be some minor inaccuracies or artistic liberties taken, overall the movie portrays the events in a fairly accurate manner.

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  • 15. 

    America achieved which of the following space firsts (i.e. ahead of the Soviets) 

    • Launched first satellite

    • Launched first manned satellite

    • First to land man on the moon and return

    • First to land man on mars and return

    Correct Answer
    A. First to land man on the moon and return
    Explanation
    America achieved the first to land man on the moon and return, which refers to the Apollo 11 mission in 1969. This historic event marked a significant milestone in space exploration and the United States' victory in the Space Race against the Soviet Union. The mission was led by astronauts Neil Armstrong, Buzz Aldrin, and Michael Collins, with Armstrong becoming the first person to set foot on the lunar surface. The successful return of the astronauts to Earth solidified America's dominance in space exploration during that time.

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  • 16. 

    Lunar colonies would be preferable to the ISS because...

    • The offer ample room to develop agriculture

    • Launches are easier due to reduced gravity

    • They provide a long term stable platform

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    Lunar colonies would be preferable to the ISS because they offer ample room to develop agriculture, launches are easier due to reduced gravity, and they provide a long-term stable platform.

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  • 17. 

    To gain access to chemical forces you need... 

    • A chemical reaction

    • Nuclear fission or fusion

    • To apply mechanical energy, e.g. movement

    • To compress or heat a substance

    Correct Answer
    A. A chemical reaction
    Explanation
    Chemical forces are interactions between atoms or molecules that hold them together or cause them to repel each other. These forces can be accessed through a chemical reaction, where atoms or molecules undergo a rearrangement of their chemical bonds. During a chemical reaction, old bonds are broken and new bonds are formed, releasing or absorbing energy in the process. This energy is a result of the chemical forces at play. Therefore, to gain access to chemical forces, a chemical reaction is required.

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  • 18. 

    Control rods are used in nuclear reactors 

    • As a source of nuclear fuel

    • To stop or slow the reactor's chain-reaction

    • To control other elements such as water level

    • As a substitute for human controllers due to the dangers involved

    Correct Answer
    A. To stop or slow the reactor's chain-reaction
    Explanation
    Control rods are used in nuclear reactors to stop or slow the reactor's chain-reaction. This is important for maintaining the stability and safety of the reactor. By inserting the control rods into the reactor core, they absorb the excess neutrons and effectively reduce the number of free neutrons available for the chain-reaction to continue. This helps prevent the reactor from overheating or becoming uncontrollable, thus avoiding potential accidents or meltdowns.

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  • 19. 

    The lecture slides used the letter ___ to indicate "Current"

    • C

    • I

    • N

    • O

    Correct Answer
    A. I
    Explanation
    The lecture slides used the letter "I" to indicate "Current".

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  • 20. 

    Which of the following was mentioned in class, but not in the notes, as an enemy of the Power Grid?

    • War

    • Economics

    • Terrorists

    • Nature

    Correct Answer
    A. Terrorists
    Explanation
    In class, the mention of terrorists as an enemy of the Power Grid implies that they pose a threat to the functioning and stability of the power supply system. While war, economics, and nature may also have some impact on the Power Grid, the fact that terrorists were specifically mentioned in class suggests that they were highlighted as a significant threat that was not covered in the notes.

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  • 21. 

    An airfoil with the proper angle of attack achieves lift when the speed of teh air flowing over it is ________ the speed of the air flowing under it. 

    • Equal to

    • Greater than

    • Less than

    • Greater than or equal too

    Correct Answer
    A. Greater than
    Explanation
    An airfoil with the proper angle of attack achieves lift when the speed of the air flowing over it is greater than the speed of the air flowing under it. This is because the air flowing over the airfoil has to travel a longer distance in the same amount of time compared to the air flowing under it. This creates a pressure difference, with lower pressure on top and higher pressure on the bottom, resulting in lift.

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  • 22. 

    The first modern (and probably most successful) commercial passenger aircraft was? 

    • The Douglas DC-3

    • The Ford Trimotor

    • The Boeing 747

    • The Boeing model 377 Stratocruiser

    Correct Answer
    A. The Douglas DC-3
    Explanation
    The Douglas DC-3 is considered the first modern and successful commercial passenger aircraft because of its significant impact on the aviation industry. It was introduced in 1936 and quickly became popular due to its advanced features, including a larger capacity for passengers, increased range, and improved reliability. The DC-3 revolutionized air travel by making it more comfortable, efficient, and accessible to the general public. Its success paved the way for future advancements in aviation and set the standard for modern passenger aircraft.

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  • 23. 

    Lift is primarily required to counteract the effect of which of the following forces? 

    • Electromagnetic

    • Thrust

    • Drag

    • Gravity

    Correct Answer
    A. Gravity
    Explanation
    Lift is primarily required to counteract the force of gravity. Gravity is the force that pulls objects towards the center of the Earth, and lift is the force that opposes gravity and allows objects to stay airborne. Without lift, objects would fall to the ground due to the force of gravity. Electromagnetic, thrust, and drag forces may affect the motion of an object, but they are not directly related to the need for lift.

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  • 24. 

    Why are cabins pressurized in modern passenger airlines flying above 30,000 ft?

    • The air pressure is too low at that altitude for humans to effectively breathe

    • It reduces the risk from fuselage to metal fatigue

    • It reduces the risk of fire and other hazards

    • Like a deep sea submarine, the fuselage must pressurized or it would implode

    Correct Answer
    A. The air pressure is too low at that altitude for humans to effectively breathe
    Explanation
    Cabins in modern passenger airlines flying above 30,000 ft are pressurized because the air pressure at such altitudes is too low for humans to effectively breathe. Pressurizing the cabin ensures that passengers have a comfortable and safe breathing environment during the flight.

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  • 25. 

    Radiation of cancer patient "cures" cancer cells by what means? 

    • Creating free ions which damage their DNA

    • By generating sufficient heat to kill them

    • By starving them from blood and its oxygen

    • By alerting the body's immune system

    Correct Answer
    A. Creating free ions which damage their DNA
    Explanation
    Radiation therapy for cancer works by creating free ions, which are charged particles, that can damage the DNA of cancer cells. These ions are generated by the radiation and when they come into contact with the DNA of cancer cells, they can cause breaks and other damage to the DNA strands. This damage can prevent the cancer cells from dividing and growing, ultimately leading to their death.

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  • 26. 

    Which of the following were responsible for the deaths caused by the Therac-25? 

    • The hospitals

    • AECL

    • The technicians

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The Therac-25 was a radiation therapy machine that caused several deaths due to radiation overdoses. The responsibility for these deaths lies with all of the options given: the hospitals, AECL (Atomic Energy of Canada Limited), and the technicians. The hospitals should have ensured proper training and supervision of the technicians operating the machine. AECL, as the manufacturer, should have designed the machine with adequate safety features and provided clear instructions for its use. The technicians, on the other hand, should have followed proper procedures and protocols while operating the machine. Therefore, all three parties share responsibility for the deaths caused by the Therac-25.

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  • 27. 

    A trojan horse is which of the following?

    • Harmful software disguised as legitimate

    • Software which is bypasses authentication

    • Self reproducing program in a file or program

    • Software that collect and sends information

    Correct Answer
    A. Harmful software disguised as legitimate
    Explanation
    A trojan horse is a type of harmful software that is disguised as legitimate software. It tricks users into thinking that it is a harmless program, but once installed, it can carry out malicious activities without the user's knowledge or consent. This can include stealing sensitive information, damaging files, or allowing unauthorized access to the user's system. The term "trojan horse" comes from Greek mythology, where a giant wooden horse was used to deceive the enemy and gain access to their city. Similarly, a trojan horse software deceives users and gains access to their computer system.

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  • 28. 

    The TCP protocol is an example of a

    • Datalink level protocol

    • Transport level (layer) protocol

    • Network level protocol

    • Application level protocol

    Correct Answer
    A. Transport level (layer) protocol
    Explanation
    The TCP protocol is a transport level (layer) protocol because it operates at the transport layer of the OSI model. This layer is responsible for end-to-end communication between hosts and ensures reliable and ordered delivery of data. TCP provides features such as flow control, error detection, and congestion control, making it suitable for applications that require reliable transmission of data, such as web browsing and file transfer.

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  • 29. 

    A large number of computers loosely connected via the internet is an example of? 

    • A cluster

    • Beowolf

    • Home network

    • Grid

    Correct Answer
    A. Grid
    Explanation
    A large number of computers loosely connected via the internet is an example of a grid. In a grid computing system, multiple computers or servers are connected together to work on a common task, sharing resources and processing power. These computers can be geographically dispersed and connected through the internet, allowing them to work together as a single system. This architecture is often used for tasks that require a high level of computational power or data processing, such as scientific research or large-scale data analysis.

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  • 30. 

    Torsion forces tend to

    • Tear structures apart (like two people pulling your arms in opposite directions)

    • Push structures in on themselves (like the crushing effect of a head-on car collision)

    • Twist structures apart (like having the top half of your body twisted in one direction and the bottom half twisted in the opposite way)

    • Tear structures like ripping pages

    Correct Answer
    A. Twist structures apart (like having the top half of your body twisted in one direction and the bottom half twisted in the opposite way)
    Explanation
    Torsion forces tend to twist structures apart, similar to having the top half of your body twisted in one direction and the bottom half twisted in the opposite way.

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  • 31. 

    A scientist is most apt to engage in which of the following activities

    • Advancing our understanding of natural phenomena

    • Only accepting what can be proven true

    • Application of knowledge to solve problems

    • Arguing the absolute truth of strongly held beliefs

    Correct Answer
    A. Advancing our understanding of natural phenomena
    Explanation
    A scientist is most likely to engage in advancing our understanding of natural phenomena because that is the primary goal of scientific research. Scientists conduct experiments, gather data, and analyze results to gain new knowledge and insights about the natural world. They strive to uncover the underlying principles and mechanisms that govern various phenomena, contributing to the overall body of scientific knowledge. By advancing our understanding, scientists can make significant discoveries, develop new theories, and potentially find practical applications for their findings.

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  • 32. 

    Random error is usually addressed by

    • Using better equipment

    • Rounding the least significant measured digits

    • Taking fewer measurements

    • Taking more measurements

    Correct Answer
    A. Taking more measurements
    Explanation
    Taking more measurements is the correct answer because random errors are unpredictable and can occur in any measurement. By taking more measurements, the random errors can be averaged out, resulting in a more accurate and precise measurement. This approach helps to minimize the impact of random errors and obtain a more reliable result. Using better equipment may reduce systematic errors but may not necessarily address random errors. Rounding the least significant measured digits may improve precision but does not directly address random errors. Taking fewer measurements may increase the impact of random errors, leading to less accurate results.

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  • 33. 

    All but ONE of the following represent some of the tools used in testing a hypothesis. Which one isn't? 

    • Perform a simulation of the problem

    • Report the problem in scholarly journals in the hope that someone else has solved it

    • Use of models or prototypes

    • Use of well-accept scientific laws

    Correct Answer
    A. Report the problem in scholarly journals in the hope that someone else has solved it
    Explanation
    The correct answer is "report the problem in scholarly journals in the hope that someone else has solved it". This option does not represent a tool used in testing a hypothesis. Instead, it suggests seeking a solution from someone else's work, which is not a direct method of hypothesis testing. The other options, such as performing a simulation, using models or prototypes, and relying on well-accepted scientific laws, are all valid tools commonly used in hypothesis testing.

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  • 34. 

    NASA has been criticized in both the Apollo and shuttle disasters for

    • Lacking talented engineers and scientists

    • Fixing problems after they arise rather than avoiding them in the first place

    • Over reliance on outside review panels

    • "Sweeping problems under the rug"- that is, ignoring them until it is too late

    Correct Answer
    A. Fixing problems after they arise rather than avoiding them in the first place
    Explanation
    The correct answer is "fixing problems after they arise rather than avoiding them in the first place". This answer is supported by the statement "NASA has been criticized in both the Apollo and shuttle disasters for over reliance on outside review panels". This suggests that NASA relied on external review panels to identify and address problems instead of proactively addressing them before they became disasters.

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  • 35. 

    The advantage of liquid fuel rocket over a solid state rocket is... 

    • The weight of the fuel it uses

    • It's easier to stop and restart liquid fuel rockets

    • The cost of the fuel

    • The shelf life (max storage of time) of liquid fuel

    Correct Answer
    A. It's easier to stop and restart liquid fuel rockets
    Explanation
    Liquid fuel rockets have the advantage of being easier to stop and restart compared to solid state rockets. This is because the fuel in liquid rockets can be controlled and regulated more effectively. In contrast, solid state rockets have a continuous and irreversible combustion process once ignited, making it difficult to stop or restart them. Being able to stop and restart liquid fuel rockets provides greater flexibility and control during space missions, allowing for adjustments in trajectory or the ability to perform multiple maneuvers.

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  • 36. 

    Which of the following is NOT a primary force

    • Electromagnetic force

    • Static force

    • Strong and weak nuclear bonding fore

    • Gravitational force

    Correct Answer
    A. Static force
    Explanation
    The static force is not a primary force. Primary forces refer to the fundamental forces of nature, and the static force does not fall into that category. The electromagnetic force, strong and weak nuclear bonding forces, and gravitational force are all primary forces as they play essential roles in the interactions between particles and objects. The static force, on the other hand, refers to the force that builds up between objects due to an imbalance of electric charges, but it is not considered a primary force.

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  • 37. 

    Power is measured in

    • Volts

    • Amps

    • Ohms

    • Watts

    Correct Answer
    A. Watts
    Explanation
    Power is a measure of the rate at which work is done or energy is transferred. It is calculated by multiplying the voltage (in volts) by the current (in amps). Therefore, power is measured in watts, as it represents the amount of energy transferred per unit of time. Volts, amps, and ohms are units of voltage, current, and resistance respectively, but they do not directly measure power.

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  • 38. 

    A possible short term solution to the country's increasing power need is... 

    • Use of HVDC on the current AC lines

    • The development of a "hydrogen grid"

    • The use of fusion nuclear power

    • Use of biodegradable duel in power plants

    Correct Answer
    A. Use of HVDC on the current AC lines
    Explanation
    A possible short term solution to the country's increasing power need is the use of HVDC (High Voltage Direct Current) on the current AC (Alternating Current) lines. HVDC technology allows for efficient transmission of electricity over long distances with minimal losses. By converting the AC power to DC and transmitting it through HVDC lines, the power can be transmitted over longer distances without significant losses, making it a viable solution for meeting the increasing power demand in the country.

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  • 39. 

    The commercial power coming into the typical American home has a voltage in the range of.... 

    • 50-110

    • 110-220 volts

    • 200-600 volts

    • 600-1200 volts

    Correct Answer
    A. 110-220 volts
    Explanation
    The commercial power coming into the typical American home has a voltage in the range of 110-220 volts. This range is commonly referred to as the standard household voltage in the United States. It is important to note that the specific voltage can vary depending on the location and electrical regulations, but the majority of residential homes in the US receive power within this range.

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  • 40. 

    The problem with prop driven planes occurs when... 

    • Foreign debris is sucked into the engines

    • Above 10,000 feet they are very inefficient

    • Their gyroscopic effect impacts flight control

    • The speed of the prop tip approaches Mach 1

    Correct Answer
    A. The speed of the prop tip approaches Mach 1
    Explanation
    When the speed of the prop tip approaches Mach 1, it causes problems for prop driven planes. As the propeller spins faster, the tips of the propeller blades start to approach the speed of sound. This can lead to a phenomenon known as "compressibility effects," where the air around the propeller becomes compressed and causes a decrease in efficiency and an increase in drag. This can result in reduced performance and potential damage to the aircraft.

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  • 41. 

    Why do modern commercial aircraft usually fly above 30,000 feet altitude?

    • To avoid the congestion of lower altitudes

    • Engines run better in the cooler atmospher

    • Less air drag to overcome than lower levels

    • Lift is greater at altitudes above 30,000 feet

    Correct Answer
    A. Less air drag to overcome than lower levels
    Explanation
    Modern commercial aircraft usually fly above 30,000 feet altitude because there is less air drag to overcome compared to lower levels. At higher altitudes, the air is thinner, which means there is less resistance for the aircraft to overcome. This reduces fuel consumption and allows the aircraft to fly more efficiently. Additionally, flying at higher altitudes helps to avoid the congestion of lower altitudes, allowing for smoother and faster flights.

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  • 42. 

    Ionizing radiation is produced by? 

    • Knocking a neutron out of its normal orbit

    • Knocking an electron out of its normal orbit

    • Knocking a proton out of its normal orbit

    • All of the above

    Correct Answer
    A. Knocking an electron out of its normal orbit
    Explanation
    Ionizing radiation is produced by knocking an electron out of its normal orbit. When an electron is removed from its orbit, it creates an ion, which is an atom or molecule with a net electric charge. This process releases energy in the form of radiation. Ionizing radiation is dangerous because it can damage living cells and genetic material, leading to various health effects such as cancer.

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  • 43. 

    X-rays are an example of what type of radiation? 

    • Electromagnetic

    • Energetic charged particle

    • Energetic non-charged particle

    • None of the above

    Correct Answer
    A. Electromagnetic
    Explanation
    X-rays are a type of electromagnetic radiation. They are a form of high-energy radiation that can penetrate through the body and create an image of the internal structures. X-rays have a shorter wavelength and higher energy than visible light, making them useful in various medical and scientific applications such as diagnosing fractures, detecting tumors, and studying the atomic structure of materials.

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  • 44. 

    According to our slides author, search engines traditionally base their ranking of a given page using which of the following?

    • Number of other sites the page links to

    • Number of other sites that link to the page

    • Number of times key words occur on the page

    • Number of hits by user on the page

    Correct Answer
    A. Number of times key words occur on the page
    Explanation
    Search engines traditionally base their ranking of a given page on the number of times keywords occur on the page. This means that search engines analyze the content of a page and determine its relevance to a particular search query based on the frequency and placement of relevant keywords. Pages that contain the searched keywords more frequently are considered more relevant and are therefore ranked higher in search engine results.

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  • 45. 

    Static equilibrium refers to forces which

    • Equal force pushing in opposite directions that exactly balance each other

    • Balance achieved with electromagnetic forces

    • Are stronger than gravitational forces

    • Result from the dead load of a bridge

    Correct Answer
    A. Equal force pushing in opposite directions that exactly balance each other
    Explanation
    Static equilibrium refers to a state where the forces acting on an object are balanced, meaning that there is no net force or acceleration. In this case, the explanation suggests that static equilibrium is achieved when there are equal forces pushing in opposite directions that exactly balance each other. This means that the forces cancel each other out, resulting in a balanced state.

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  • 46. 

    The shuttle has prove to have? 

    • A effort of limited engineering success

    • Provided great insight into interplanetary flight

    • Be costly to than earlier launch vehicles

    • A string of disasters similar to those of Apollo

    Correct Answer
    A. A string of disasters similar to those of Apollo
    Explanation
    The correct answer is "a string of disasters similar to those of Apollo". This means that the shuttle has experienced a series of failures or accidents that are comparable to the failures experienced by the Apollo program.

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  • 47. 

    According to class notes, work is defined to be

    • The application of energy

    • Potential or stored energy

    • Kinetic or moving energy

    • Transfer of energy from 1 system to another

    Correct Answer
    A. Transfer of energy from 1 system to another
    Explanation
    Work is defined as the transfer of energy from one system to another. This means that work occurs when energy is transferred from one object to another, resulting in a change in the energy of the system. It can involve the application of energy, such as when a force is applied to an object, or the conversion of potential or stored energy into kinetic or moving energy. Therefore, the correct answer is "transfer of energy from one system to another."

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  • 48. 

    An advantage of HVDC power transmission is?

    • Ability to carry more power over a given line

    • The ease of tapping into the line

    • Power loss is independent of distance traveled

    • Low cost of DC to AC power conversion

    Correct Answer
    A. Ability to carry more power over a given line
    Explanation
    HVDC power transmission has the advantage of being able to carry more power over a given line compared to AC power transmission. This is because direct current (DC) has lower losses in the transmission line, allowing for a higher power transfer. In AC transmission, the power transfer is limited by factors such as line impedance and reactive power. However, in HVDC transmission, power can be transmitted over long distances with minimal losses, making it more efficient for carrying large amounts of power over a single line.

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  • 49. 

    After their initial use in military applications, airplanes found their next area of wide applications in? 

    • Passenger service

    • Mail service

    • Hauling freight

    • Crop dusting

    Correct Answer
    A. Mail service
    Explanation
    After their initial use in military applications, airplanes found their next area of wide applications in mail service. This was because airplanes offered a faster and more efficient way to transport mail over long distances compared to traditional methods such as trains or ships. The speed and range of airplanes made it possible to deliver mail quickly to remote areas, improving communication and connectivity. Additionally, airplanes could bypass geographical obstacles and deliver mail directly to its destination, making it a preferred choice for mail service.

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Quiz Review Timeline (Updated): Mar 20, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 12, 2010
    Quiz Created by
    Jackiemwheeler
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