A noise level of 100 decibels is comparable to the noise generated in a machine shop. This sound level is quite loud and is significantly higher than the levels of ordinary conversation or typical street noise. At 100 decibels, the noise is intense enough to cause potential hearing damage if exposurRead more
A noise level of 100 decibels is comparable to the noise generated in a machine shop. This sound level is quite loud and is significantly higher than the levels of ordinary conversation or typical street noise. At 100 decibels, the noise is intense enough to cause potential hearing damage if exposure is prolonged without adequate ear protection. Common examples of sources that produce 100 decibels include heavy machinery, industrial equipment, and some loud music concerts. Understanding and managing noise levels in environments such as machine shops is crucial for occupational safety and health, necessitating the use of hearing protection and other noise control measures. Therefore, the correct answer is [D] Noise coming from a machine shop.
The intensity of sound during a normal conversation usually falls within the range of 50 to 60 decibels. This sound level is considered moderate and is typical of everyday human interactions where people speak at a comfortable volume. The decibel scale, which measures sound intensity, shows that thiRead more
The intensity of sound during a normal conversation usually falls within the range of 50 to 60 decibels. This sound level is considered moderate and is typical of everyday human interactions where people speak at a comfortable volume. The decibel scale, which measures sound intensity, shows that this range is neither too quiet nor excessively loud, making it ideal for clear communication without causing discomfort. In comparison, whispering is around 20-30 decibels, while shouting can exceed 70 decibels. Understanding this range is important for designing spaces like offices, classrooms, and public areas to ensure they support effective communication without contributing to noise pollution. Hence, the correct answer is [C] 50-60 decibels.
Sound or noise pollution is measured in decibels (dB), a unit used to quantify the intensity of sound. Decibels provide a logarithmic scale that corresponds to the human ear's perception of sound levels, making it suitable for measuring both very soft and very loud sounds. The decibel scale is usedRead more
Sound or noise pollution is measured in decibels (dB), a unit used to quantify the intensity of sound. Decibels provide a logarithmic scale that corresponds to the human ear’s perception of sound levels, making it suitable for measuring both very soft and very loud sounds. The decibel scale is used to express a wide range of sound pressures, from the faintest sound the human ear can detect (0 dB) to levels that can cause immediate harm (above 120 dB). Noise pollution, which refers to harmful or excessive levels of noise in the environment, is assessed using decibels to determine its impact on human health and well-being. This measurement is crucial for regulating noise levels in various settings, such as urban areas, workplaces, and transportation systems. Hence, the correct answer is [C] Decibel.
Mach numbers are used primarily in relation to the velocity of objects moving through a fluid, such as air, and are most commonly applied to aircraft. The Mach number represents the ratio of an object's speed to the speed of sound in the same medium. For example, an aircraft traveling at Mach 1 moveRead more
Mach numbers are used primarily in relation to the velocity of objects moving through a fluid, such as air, and are most commonly applied to aircraft. The Mach number represents the ratio of an object’s speed to the speed of sound in the same medium. For example, an aircraft traveling at Mach 1 moves at the speed of sound, while at Mach 2, it travels twice as fast as sound. This concept is crucial in aerodynamics, influencing the design, performance, and behavior of aircraft, particularly at high speeds where compressibility effects and shock waves become significant. While Mach numbers can also apply to other high-speed vehicles like spacecraft, their primary and most frequent use is in the context of aircraft. Therefore, the correct answer is [C] Aircraft.
The ratio of an object's velocity to the velocity of sound in the same medium and under the same conditions is called the Mach number. Named after physicist Ernst Mach, it is a dimensionless quantity that represents the object's speed relative to the speed of sound. For instance, an aircraft traveliRead more
The ratio of an object’s velocity to the velocity of sound in the same medium and under the same conditions is called the Mach number. Named after physicist Ernst Mach, it is a dimensionless quantity that represents the object’s speed relative to the speed of sound. For instance, an aircraft traveling at Mach 2 moves at twice the speed of sound. This concept is essential in aerodynamics and fluid mechanics, influencing the study and design of high-speed vehicles such as aircraft and spacecraft. The Mach number determines the flow regime: subsonic (Mach 1), and hypersonic (Mach > 5). It affects airflow behavior, shock waves, and compressibility effects, making it a crucial parameter for engineers and scientists working on high-speed travel and technologies. Hence, the correct answer is [D] Mach number.
If the horse starts moving suddenly, the possibility of the rider falling is due to inertia. Inertia is the property of matter that resists changes in motion. When the horse accelerates forward, the rider tends to remain at rest due to their inertia. This causes the rider to lean backward or lose baRead more
If the horse starts moving suddenly, the possibility of the rider falling is due to inertia. Inertia is the property of matter that resists changes in motion. When the horse accelerates forward, the rider tends to remain at rest due to their inertia. This causes the rider to lean backward or lose balance, potentially leading to a fall. This phenomenon aligns with Newton’s first law of motion, often referred to as the law of inertia. According to this law, an object at rest will remain at rest unless acted upon by an external force. In this scenario, the sudden motion of the horse acts as the external force, causing the rider to experience a change in motion. Therefore, the possibility of the rider falling when the horse starts moving suddenly can be attributed to the principle of inertia described by Newton’s first law of motion.
The working system of a rocket is based on the principle of conservation of momentum option [A]. This principle dictates that the total momentum of a system remains constant if no external forces act upon it. Rockets propel forward by expelling mass backward at high speeds, resulting in an equal andRead more
The working system of a rocket is based on the principle of conservation of momentum option [A]. This principle dictates that the total momentum of a system remains constant if no external forces act upon it. Rockets propel forward by expelling mass backward at high speeds, resulting in an equal and opposite reaction force propelling the rocket forward. This action-reaction pair demonstrates the conservation of momentum, where the momentum gained by the rocket is equal and opposite to the momentum lost by the expelled exhaust gases. This fundamental principle underlies the functionality of rocket engines and enables spacecraft to achieve propulsion in the vacuum of space where there is no air for traditional propulsion methods like jet engines. Therefore, the conservation of momentum serves as the foundational principle for the operation of rocket systems.
When a moving bus suddenly applies brakes, the passengers sitting in it fall forward. This can be explained by Newton's first law of motion, also known as the law of inertia. This law states that an object in motion will remain in motion with the same speed and direction unless acted upon by an exteRead more
When a moving bus suddenly applies brakes, the passengers sitting in it fall forward. This can be explained by Newton’s first law of motion, also known as the law of inertia. This law states that an object in motion will remain in motion with the same speed and direction unless acted upon by an external force. When the bus abruptly stops, the passengers, who were previously moving forward with the bus, continue to move forward due to their inertia. However, the bus provides the external force that abruptly halts their forward motion, causing them to fall forward. This phenomenon is commonly experienced in vehicles when sudden deceleration occurs, highlighting the fundamental principle of inertia described by Newton’s first law of motion.
The horse pulling a cart moves forward due to the force applied by the horse on the cart. When the horse exerts force on the cart through its muscles, an equal and opposite reaction force acts on the horse, causing it to move forward according to Newton's third law of motion. This force is transmittRead more
The horse pulling a cart moves forward due to the force applied by the horse on the cart. When the horse exerts force on the cart through its muscles, an equal and opposite reaction force acts on the horse, causing it to move forward according to Newton’s third law of motion. This force is transmitted through the harness or reins connecting the horse to the cart, resulting in the forward motion of the cart. Options [A], [C], and [D] are not relevant to the forward motion of the cart. While the force of gravity and contact forces between the horse’s hooves and the ground play roles in facilitating motion, they are not the primary forces responsible for the cart’s forward movement. Therefore, the correct answer is [B] By the force applied by the horse on the cart.
Newton's first law is also called the Law of Inertia. This law states that an object will remain at rest or in uniform motion unless acted upon by an external force. Inertia refers to the tendency of objects to maintain their state of motion. Options [A] Law of moment, [C] Law of energy, and [D] LawRead more
Newton’s first law is also called the Law of Inertia. This law states that an object will remain at rest or in uniform motion unless acted upon by an external force. Inertia refers to the tendency of objects to maintain their state of motion. Options [A] Law of moment, [C] Law of energy, and [D] Law of Momentum do not accurately describe Newton’s first law. While momentum and energy are important concepts in physics, they are not directly related to this law. The term “moment” is not commonly associated with Newton’s laws of motion. Therefore, the correct answer is [B] Law of Inertia, which succinctly captures the essence of Newton’s first law and its significance in understanding the behavior of objects in motion.
A noise level of 100 decibels would correspond to which of the following?
A noise level of 100 decibels is comparable to the noise generated in a machine shop. This sound level is quite loud and is significantly higher than the levels of ordinary conversation or typical street noise. At 100 decibels, the noise is intense enough to cause potential hearing damage if exposurRead more
A noise level of 100 decibels is comparable to the noise generated in a machine shop. This sound level is quite loud and is significantly higher than the levels of ordinary conversation or typical street noise. At 100 decibels, the noise is intense enough to cause potential hearing damage if exposure is prolonged without adequate ear protection. Common examples of sources that produce 100 decibels include heavy machinery, industrial equipment, and some loud music concerts. Understanding and managing noise levels in environments such as machine shops is crucial for occupational safety and health, necessitating the use of hearing protection and other noise control measures. Therefore, the correct answer is [D] Noise coming from a machine shop.
See lessThe intensity of sound of normal conversation is
The intensity of sound during a normal conversation usually falls within the range of 50 to 60 decibels. This sound level is considered moderate and is typical of everyday human interactions where people speak at a comfortable volume. The decibel scale, which measures sound intensity, shows that thiRead more
The intensity of sound during a normal conversation usually falls within the range of 50 to 60 decibels. This sound level is considered moderate and is typical of everyday human interactions where people speak at a comfortable volume. The decibel scale, which measures sound intensity, shows that this range is neither too quiet nor excessively loud, making it ideal for clear communication without causing discomfort. In comparison, whispering is around 20-30 decibels, while shouting can exceed 70 decibels. Understanding this range is important for designing spaces like offices, classrooms, and public areas to ensure they support effective communication without contributing to noise pollution. Hence, the correct answer is [C] 50-60 decibels.
See lessSound or noise pollution is measured in
Sound or noise pollution is measured in decibels (dB), a unit used to quantify the intensity of sound. Decibels provide a logarithmic scale that corresponds to the human ear's perception of sound levels, making it suitable for measuring both very soft and very loud sounds. The decibel scale is usedRead more
Sound or noise pollution is measured in decibels (dB), a unit used to quantify the intensity of sound. Decibels provide a logarithmic scale that corresponds to the human ear’s perception of sound levels, making it suitable for measuring both very soft and very loud sounds. The decibel scale is used to express a wide range of sound pressures, from the faintest sound the human ear can detect (0 dB) to levels that can cause immediate harm (above 120 dB). Noise pollution, which refers to harmful or excessive levels of noise in the environment, is assessed using decibels to determine its impact on human health and well-being. This measurement is crucial for regulating noise levels in various settings, such as urban areas, workplaces, and transportation systems. Hence, the correct answer is [C] Decibel.
See lessMach numbers are used in relation to velocity
Mach numbers are used primarily in relation to the velocity of objects moving through a fluid, such as air, and are most commonly applied to aircraft. The Mach number represents the ratio of an object's speed to the speed of sound in the same medium. For example, an aircraft traveling at Mach 1 moveRead more
Mach numbers are used primarily in relation to the velocity of objects moving through a fluid, such as air, and are most commonly applied to aircraft. The Mach number represents the ratio of an object’s speed to the speed of sound in the same medium. For example, an aircraft traveling at Mach 1 moves at the speed of sound, while at Mach 2, it travels twice as fast as sound. This concept is crucial in aerodynamics, influencing the design, performance, and behavior of aircraft, particularly at high speeds where compressibility effects and shock waves become significant. While Mach numbers can also apply to other high-speed vehicles like spacecraft, their primary and most frequent use is in the context of aircraft. Therefore, the correct answer is [C] Aircraft.
See lessThe ratio of the velocity of the object and the velocity of sound in the same medium and under the same conditions is called
The ratio of an object's velocity to the velocity of sound in the same medium and under the same conditions is called the Mach number. Named after physicist Ernst Mach, it is a dimensionless quantity that represents the object's speed relative to the speed of sound. For instance, an aircraft traveliRead more
The ratio of an object’s velocity to the velocity of sound in the same medium and under the same conditions is called the Mach number. Named after physicist Ernst Mach, it is a dimensionless quantity that represents the object’s speed relative to the speed of sound. For instance, an aircraft traveling at Mach 2 moves at twice the speed of sound. This concept is essential in aerodynamics and fluid mechanics, influencing the study and design of high-speed vehicles such as aircraft and spacecraft. The Mach number determines the flow regime: subsonic (Mach 1), and hypersonic (Mach > 5). It affects airflow behavior, shock waves, and compressibility effects, making it a crucial parameter for engineers and scientists working on high-speed travel and technologies. Hence, the correct answer is [D] Mach number.
See lessIf the horse starts moving suddenly, then the reason for the possibility of the rider falling is
If the horse starts moving suddenly, the possibility of the rider falling is due to inertia. Inertia is the property of matter that resists changes in motion. When the horse accelerates forward, the rider tends to remain at rest due to their inertia. This causes the rider to lean backward or lose baRead more
If the horse starts moving suddenly, the possibility of the rider falling is due to inertia. Inertia is the property of matter that resists changes in motion. When the horse accelerates forward, the rider tends to remain at rest due to their inertia. This causes the rider to lean backward or lose balance, potentially leading to a fall. This phenomenon aligns with Newton’s first law of motion, often referred to as the law of inertia. According to this law, an object at rest will remain at rest unless acted upon by an external force. In this scenario, the sudden motion of the horse acts as the external force, causing the rider to experience a change in motion. Therefore, the possibility of the rider falling when the horse starts moving suddenly can be attributed to the principle of inertia described by Newton’s first law of motion.
See lessOn which principle is the working system of rocket based?
The working system of a rocket is based on the principle of conservation of momentum option [A]. This principle dictates that the total momentum of a system remains constant if no external forces act upon it. Rockets propel forward by expelling mass backward at high speeds, resulting in an equal andRead more
The working system of a rocket is based on the principle of conservation of momentum option [A]. This principle dictates that the total momentum of a system remains constant if no external forces act upon it. Rockets propel forward by expelling mass backward at high speeds, resulting in an equal and opposite reaction force propelling the rocket forward. This action-reaction pair demonstrates the conservation of momentum, where the momentum gained by the rocket is equal and opposite to the momentum lost by the expelled exhaust gases. This fundamental principle underlies the functionality of rocket engines and enables spacecraft to achieve propulsion in the vacuum of space where there is no air for traditional propulsion methods like jet engines. Therefore, the conservation of momentum serves as the foundational principle for the operation of rocket systems.
See lessWhen a moving bus suddenly applies brakes, the passengers sitting in it fall forward. This can be explained by
When a moving bus suddenly applies brakes, the passengers sitting in it fall forward. This can be explained by Newton's first law of motion, also known as the law of inertia. This law states that an object in motion will remain in motion with the same speed and direction unless acted upon by an exteRead more
When a moving bus suddenly applies brakes, the passengers sitting in it fall forward. This can be explained by Newton’s first law of motion, also known as the law of inertia. This law states that an object in motion will remain in motion with the same speed and direction unless acted upon by an external force. When the bus abruptly stops, the passengers, who were previously moving forward with the bus, continue to move forward due to their inertia. However, the bus provides the external force that abruptly halts their forward motion, causing them to fall forward. This phenomenon is commonly experienced in vehicles when sudden deceleration occurs, highlighting the fundamental principle of inertia described by Newton’s first law of motion.
See lessDue to which force does a horse pulling a cart move forward?
The horse pulling a cart moves forward due to the force applied by the horse on the cart. When the horse exerts force on the cart through its muscles, an equal and opposite reaction force acts on the horse, causing it to move forward according to Newton's third law of motion. This force is transmittRead more
The horse pulling a cart moves forward due to the force applied by the horse on the cart. When the horse exerts force on the cart through its muscles, an equal and opposite reaction force acts on the horse, causing it to move forward according to Newton’s third law of motion. This force is transmitted through the harness or reins connecting the horse to the cart, resulting in the forward motion of the cart. Options [A], [C], and [D] are not relevant to the forward motion of the cart. While the force of gravity and contact forces between the horse’s hooves and the ground play roles in facilitating motion, they are not the primary forces responsible for the cart’s forward movement. Therefore, the correct answer is [B] By the force applied by the horse on the cart.
See lessNewton’s first law is also called
Newton's first law is also called the Law of Inertia. This law states that an object will remain at rest or in uniform motion unless acted upon by an external force. Inertia refers to the tendency of objects to maintain their state of motion. Options [A] Law of moment, [C] Law of energy, and [D] LawRead more
Newton’s first law is also called the Law of Inertia. This law states that an object will remain at rest or in uniform motion unless acted upon by an external force. Inertia refers to the tendency of objects to maintain their state of motion. Options [A] Law of moment, [C] Law of energy, and [D] Law of Momentum do not accurately describe Newton’s first law. While momentum and energy are important concepts in physics, they are not directly related to this law. The term “moment” is not commonly associated with Newton’s laws of motion. Therefore, the correct answer is [B] Law of Inertia, which succinctly captures the essence of Newton’s first law and its significance in understanding the behavior of objects in motion.
See less