Ink comes out from a fountain pen in an airplane because air pressure decreases with an increase in altitude ; option [A]. As the aircraft ascends to higher altitudes, the atmospheric pressure surrounding the pen decreases. However, the pressure inside the pen remains relatively constant due to theRead more
Ink comes out from a fountain pen in an airplane because air pressure decreases with an increase in altitude ; option [A]. As the aircraft ascends to higher altitudes, the atmospheric pressure surrounding the pen decreases. However, the pressure inside the pen remains relatively constant due to the sealed environment. This pressure disparity causes the air inside the pen to expand, creating a higher pressure inside than outside. Consequently, the increased pressure inside the pen forces ink out of the nib, leading to ink leakage. This phenomenon occurs because gases, like the air inside the pen, tend to expand when subjected to lower pressure environments. Therefore, the decreasing atmospheric pressure at higher altitudes allows the air inside the pen to expand, pushing the ink outward. As a result, passengers may experience ink leaks from fountain pens during flights, particularly during takeoff and ascent when the altitude rapidly increases, causing a significant drop in atmospheric pressure. Thus, the correct answer is [A] air pressure decreases with increase in altitude.
Option B: The value of 'g' at the surface of the Earth will increase by 2%. When the radius decreases by 1%, the acceleration due to gravity (g) at the surface increases because the gravitational force depends inversely on the square of the distance between two objects. Therefore, a smaller radius lRead more
Option B: The value of ‘g’ at the surface of the Earth will increase by 2%. When the radius decreases by 1%, the acceleration due to gravity (g) at the surface increases because the gravitational force depends inversely on the square of the distance between two objects. Therefore, a smaller radius leads to a stronger gravitational pull, resulting in a 2% increase in ‘g’.
Option A: Water boils at temperatures below 100°C at high altitudes because atmospheric pressure decreases. At higher altitudes, the column of air above is shorter, resulting in lower atmospheric pressure. Since boiling occurs when the vapor pressure of a liquid equals the atmospheric pressure, theRead more
Option A: Water boils at temperatures below 100°C at high altitudes because atmospheric pressure decreases. At higher altitudes, the column of air above is shorter, resulting in lower atmospheric pressure. Since boiling occurs when the vapor pressure of a liquid equals the atmospheric pressure, the reduced atmospheric pressure means water molecules can escape the liquid phase more easily, causing it to boil at lower temperatures. This principle is why water boils faster in a pressure cooker, where increased pressure raises the boiling point. Options B and C are incorrect; gravity’s slight variation with altitude or wind patterns don’t significantly affect water’s boiling point. Therefore, the correct explanation lies in the decrease in atmospheric pressure, which directly impacts the boiling point of water at high altitudes.
Option B: The pressure inside the soap bubble is less than atmospheric pressure. This is due to the surface tension of the soap film. Surface tension causes the soap bubble to minimize its surface area, resulting in a slightly higher pressure inside the bubble compared to outside. However, this presRead more
Option B: The pressure inside the soap bubble is less than atmospheric pressure. This is due to the surface tension of the soap film. Surface tension causes the soap bubble to minimize its surface area, resulting in a slightly higher pressure inside the bubble compared to outside. However, this pressure is still less than atmospheric pressure. The soap film acts like a stretched elastic membrane, exerting an inward force that balances the tendency of the bubble to expand due to the pressure difference. If the pressure inside the bubble were greater than atmospheric pressure, the bubble would burst. Therefore, option B is correct. Options A, C, and D are incorrect as they do not accurately describe the pressure inside a soap bubble. It’s crucial to understand the role of surface tension in maintaining the shape and stability of soap bubbles, as it influences the pressure distribution inside the bubble.
Option C: We slip on muddy roads due to lack of friction. Friction is the force that opposes motion between surfaces in contact. Muddy surfaces reduce friction because the water and soil particles act as lubricants, decreasing the grip between our shoes and the ground. Consequently, when we apply foRead more
Option C: We slip on muddy roads due to lack of friction. Friction is the force that opposes motion between surfaces in contact. Muddy surfaces reduce friction because the water and soil particles act as lubricants, decreasing the grip between our shoes and the ground. Consequently, when we apply force to move forward, the insufficient friction fails to provide the necessary traction, causing us to slip. Options A (Gravitational force) and B (Relative velocity) are not directly related to slipping on muddy roads. While gravity plays a role in keeping us grounded, it doesn’t cause slipping. Relative velocity refers to the velocity of one object relative to another and is not relevant in this context. Option D (Excess of friction) is also incorrect; excess friction would provide more grip, reducing slipping. Therefore, the primary reason for slipping on muddy roads is the lack of friction, which is crucial for maintaining traction and preventing slipping on various surfaces.
Ink comes out from a fountain pen in an aeroplane, because
Ink comes out from a fountain pen in an airplane because air pressure decreases with an increase in altitude ; option [A]. As the aircraft ascends to higher altitudes, the atmospheric pressure surrounding the pen decreases. However, the pressure inside the pen remains relatively constant due to theRead more
Ink comes out from a fountain pen in an airplane because air pressure decreases with an increase in altitude ; option [A]. As the aircraft ascends to higher altitudes, the atmospheric pressure surrounding the pen decreases. However, the pressure inside the pen remains relatively constant due to the sealed environment. This pressure disparity causes the air inside the pen to expand, creating a higher pressure inside than outside. Consequently, the increased pressure inside the pen forces ink out of the nib, leading to ink leakage. This phenomenon occurs because gases, like the air inside the pen, tend to expand when subjected to lower pressure environments. Therefore, the decreasing atmospheric pressure at higher altitudes allows the air inside the pen to expand, pushing the ink outward. As a result, passengers may experience ink leaks from fountain pens during flights, particularly during takeoff and ascent when the altitude rapidly increases, causing a significant drop in atmospheric pressure. Thus, the correct answer is [A] air pressure decreases with increase in altitude.
See lessIf the mass of the Earth remains the same and the radius decreases by 1%, then the value of g at the surface of the Earth will increase by
Option B: The value of 'g' at the surface of the Earth will increase by 2%. When the radius decreases by 1%, the acceleration due to gravity (g) at the surface increases because the gravitational force depends inversely on the square of the distance between two objects. Therefore, a smaller radius lRead more
Option B: The value of ‘g’ at the surface of the Earth will increase by 2%. When the radius decreases by 1%, the acceleration due to gravity (g) at the surface increases because the gravitational force depends inversely on the square of the distance between two objects. Therefore, a smaller radius leads to a stronger gravitational pull, resulting in a 2% increase in ‘g’.
See lessWhy does water boil at temperatures below 100 °C at high altitudes?
Option A: Water boils at temperatures below 100°C at high altitudes because atmospheric pressure decreases. At higher altitudes, the column of air above is shorter, resulting in lower atmospheric pressure. Since boiling occurs when the vapor pressure of a liquid equals the atmospheric pressure, theRead more
Option A: Water boils at temperatures below 100°C at high altitudes because atmospheric pressure decreases. At higher altitudes, the column of air above is shorter, resulting in lower atmospheric pressure. Since boiling occurs when the vapor pressure of a liquid equals the atmospheric pressure, the reduced atmospheric pressure means water molecules can escape the liquid phase more easily, causing it to boil at lower temperatures. This principle is why water boils faster in a pressure cooker, where increased pressure raises the boiling point. Options B and C are incorrect; gravity’s slight variation with altitude or wind patterns don’t significantly affect water’s boiling point. Therefore, the correct explanation lies in the decrease in atmospheric pressure, which directly impacts the boiling point of water at high altitudes.
See lessThe pressure inside the soap bubble is
Option B: The pressure inside the soap bubble is less than atmospheric pressure. This is due to the surface tension of the soap film. Surface tension causes the soap bubble to minimize its surface area, resulting in a slightly higher pressure inside the bubble compared to outside. However, this presRead more
Option B: The pressure inside the soap bubble is less than atmospheric pressure. This is due to the surface tension of the soap film. Surface tension causes the soap bubble to minimize its surface area, resulting in a slightly higher pressure inside the bubble compared to outside. However, this pressure is still less than atmospheric pressure. The soap film acts like a stretched elastic membrane, exerting an inward force that balances the tendency of the bubble to expand due to the pressure difference. If the pressure inside the bubble were greater than atmospheric pressure, the bubble would burst. Therefore, option B is correct. Options A, C, and D are incorrect as they do not accurately describe the pressure inside a soap bubble. It’s crucial to understand the role of surface tension in maintaining the shape and stability of soap bubbles, as it influences the pressure distribution inside the bubble.
See lessWhy do we slip on muddy roads?
Option C: We slip on muddy roads due to lack of friction. Friction is the force that opposes motion between surfaces in contact. Muddy surfaces reduce friction because the water and soil particles act as lubricants, decreasing the grip between our shoes and the ground. Consequently, when we apply foRead more
Option C: We slip on muddy roads due to lack of friction. Friction is the force that opposes motion between surfaces in contact. Muddy surfaces reduce friction because the water and soil particles act as lubricants, decreasing the grip between our shoes and the ground. Consequently, when we apply force to move forward, the insufficient friction fails to provide the necessary traction, causing us to slip. Options A (Gravitational force) and B (Relative velocity) are not directly related to slipping on muddy roads. While gravity plays a role in keeping us grounded, it doesn’t cause slipping. Relative velocity refers to the velocity of one object relative to another and is not relevant in this context. Option D (Excess of friction) is also incorrect; excess friction would provide more grip, reducing slipping. Therefore, the primary reason for slipping on muddy roads is the lack of friction, which is crucial for maintaining traction and preventing slipping on various surfaces.
See less