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.
Option D: A sudden drop in the reading of the barometer is an indication that the weather will be stormy. The barometer measures atmospheric pressure, which typically decreases before a storm due to the low-pressure system associated with stormy weather. A sudden drop in pressure suggests that a rapRead more
Option D: A sudden drop in the reading of the barometer is an indication that the weather will be stormy. The barometer measures atmospheric pressure, which typically decreases before a storm due to the low-pressure system associated with stormy weather. A sudden drop in pressure suggests that a rapidly intensifying low-pressure system, such as a cyclone or storm front, is approaching. This drop indicates unstable atmospheric conditions, often leading to precipitation, strong winds, and turbulent weather patterns associated with storms. Option A (stable and calm weather) is unlikely because a sudden drop in pressure signifies changing atmospheric conditions, while option B (rainy weather) could occur, but the focus here is on the broader implications of stormy weather. Option C (cold weather) is not necessarily correlated with a sudden drop in pressure; cold fronts may cause pressure changes, but they don’t always result in stormy conditions. Therefore, a sudden drop in the barometer reading is a reliable indicator of impending stormy weather, characterized by turbulent atmospheric conditions, precipitation, and strong winds.
Option A: Due to the increase in the height of the atmosphere, the size of the balloon will decrease. As the balloon rises, the atmospheric pressure decreases. Since the pressure inside the balloon remains constant due to the ideal gas law, the gas molecules inside expand to occupy more space. HowevRead more
Option A: Due to the increase in the height of the atmosphere, the size of the balloon will decrease. As the balloon rises, the atmospheric pressure decreases. Since the pressure inside the balloon remains constant due to the ideal gas law, the gas molecules inside expand to occupy more space. However, the balloon’s material constrains this expansion, causing it to stretch and decrease in size. Therefore, the balloon appears to shrink as it ascends. Option B (The balloon will flatten and come in the shape of a disc) is incorrect because the balloon’s shape is determined by its elasticity and the pressure difference between the inside and outside. As the pressure inside remains constant, the balloon’s shape won’t flatten into a disc. Option C (The size of the balloon will increase) is also incorrect because, although the gas inside expands, the material constrains this expansion, causing the balloon’s size to decrease. Option D (The size and shape of the balloon will remain the same as before) is inaccurate because the balloon’s size decreases due to the pressure difference between the inside and outside as it ascends through the atmosphere. Therefore, option A, the size of the balloon will decrease, is the correct choice.
Option A: It is more difficult to breathe on mountains than on plains because as altitude increases, air pressure decreases, and the need for oxygen increases. At higher altitudes, the air pressure is lower, meaning there are fewer air molecules per volume. This reduced air pressure makes it harderRead more
Option A: It is more difficult to breathe on mountains than on plains because as altitude increases, air pressure decreases, and the need for oxygen increases. At higher altitudes, the air pressure is lower, meaning there are fewer air molecules per volume. This reduced air pressure makes it harder for our lungs to take in oxygen from the air. Additionally, with lower air pressure, the partial pressure of oxygen decreases, making it more challenging for oxygen to diffuse into the bloodstream. As a result, our bodies need to work harder to obtain the same amount of oxygen, leading to symptoms like shortness of breath, dizziness, and fatigue at high altitudes. Option B (Mountain air is heavy and cannot be filled in the lungs) is incorrect; mountain air is not heavier, but rather thinner due to lower pressure. Option C (Mountain air is impure, hence we cannot take it) is also incorrect; while air quality may vary, difficulty in breathing at high altitudes is primarily due to lower air pressure, not impurities in the air. Therefore, option A accurately explains why it is more difficult to breathe on mountains compared to plains.
The 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 lessA sudden drop in the reading of the barometer is an indication that the weather will
Option D: A sudden drop in the reading of the barometer is an indication that the weather will be stormy. The barometer measures atmospheric pressure, which typically decreases before a storm due to the low-pressure system associated with stormy weather. A sudden drop in pressure suggests that a rapRead more
Option D: A sudden drop in the reading of the barometer is an indication that the weather will be stormy. The barometer measures atmospheric pressure, which typically decreases before a storm due to the low-pressure system associated with stormy weather. A sudden drop in pressure suggests that a rapidly intensifying low-pressure system, such as a cyclone or storm front, is approaching. This drop indicates unstable atmospheric conditions, often leading to precipitation, strong winds, and turbulent weather patterns associated with storms. Option A (stable and calm weather) is unlikely because a sudden drop in pressure signifies changing atmospheric conditions, while option B (rainy weather) could occur, but the focus here is on the broader implications of stormy weather. Option C (cold weather) is not necessarily correlated with a sudden drop in pressure; cold fronts may cause pressure changes, but they don’t always result in stormy conditions. Therefore, a sudden drop in the barometer reading is a reliable indicator of impending stormy weather, characterized by turbulent atmospheric conditions, precipitation, and strong winds.
See lessA polythene balloon filled with hydrogen is released from the earth’s surface. Due to increase in the height of the atmosphere
Option A: Due to the increase in the height of the atmosphere, the size of the balloon will decrease. As the balloon rises, the atmospheric pressure decreases. Since the pressure inside the balloon remains constant due to the ideal gas law, the gas molecules inside expand to occupy more space. HowevRead more
Option A: Due to the increase in the height of the atmosphere, the size of the balloon will decrease. As the balloon rises, the atmospheric pressure decreases. Since the pressure inside the balloon remains constant due to the ideal gas law, the gas molecules inside expand to occupy more space. However, the balloon’s material constrains this expansion, causing it to stretch and decrease in size. Therefore, the balloon appears to shrink as it ascends. Option B (The balloon will flatten and come in the shape of a disc) is incorrect because the balloon’s shape is determined by its elasticity and the pressure difference between the inside and outside. As the pressure inside remains constant, the balloon’s shape won’t flatten into a disc. Option C (The size of the balloon will increase) is also incorrect because, although the gas inside expands, the material constrains this expansion, causing the balloon’s size to decrease. Option D (The size and shape of the balloon will remain the same as before) is inaccurate because the balloon’s size decreases due to the pressure difference between the inside and outside as it ascends through the atmosphere. Therefore, option A, the size of the balloon will decrease, is the correct choice.
See lessWhy is it more difficult to breathe on mountains than on plains?
Option A: It is more difficult to breathe on mountains than on plains because as altitude increases, air pressure decreases, and the need for oxygen increases. At higher altitudes, the air pressure is lower, meaning there are fewer air molecules per volume. This reduced air pressure makes it harderRead more
Option A: It is more difficult to breathe on mountains than on plains because as altitude increases, air pressure decreases, and the need for oxygen increases. At higher altitudes, the air pressure is lower, meaning there are fewer air molecules per volume. This reduced air pressure makes it harder for our lungs to take in oxygen from the air. Additionally, with lower air pressure, the partial pressure of oxygen decreases, making it more challenging for oxygen to diffuse into the bloodstream. As a result, our bodies need to work harder to obtain the same amount of oxygen, leading to symptoms like shortness of breath, dizziness, and fatigue at high altitudes. Option B (Mountain air is heavy and cannot be filled in the lungs) is incorrect; mountain air is not heavier, but rather thinner due to lower pressure. Option C (Mountain air is impure, hence we cannot take it) is also incorrect; while air quality may vary, difficulty in breathing at high altitudes is primarily due to lower air pressure, not impurities in the air. Therefore, option A accurately explains why it is more difficult to breathe on mountains compared to plains.
See less