A swimmer finds it easier to swim in seawater than in a river because the density of seawater is higher than that of ordinary water (C). Higher density in seawater provides more buoyant force, allowing the swimmer to float more easily and requiring less effort to stay afloat. This increased buoyancyRead more
A swimmer finds it easier to swim in seawater than in a river because the density of seawater is higher than that of ordinary water (C). Higher density in seawater provides more buoyant force, allowing the swimmer to float more easily and requiring less effort to stay afloat. This increased buoyancy aids in maintaining proper body positioning and reduces the risk of sinking. Additionally, the salt content in seawater contributes to increased buoyancy compared to freshwater. Options (A), (B), and (D) are irrelevant to the ease of swimming in seawater and do not address the specific physical properties that make swimming easier, such as buoyancy. Therefore, the correct option is (C) The density of seawater is higher than that of ordinary water.
The reason for the floating of clouds in the atmosphere is density (D). Clouds consist of tiny water droplets or ice crystals that are less dense than the surrounding air. This lower density causes the clouds to float or remain suspended in the atmosphere. Temperature (A), velocity (B), and pressureRead more
The reason for the floating of clouds in the atmosphere is density (D). Clouds consist of tiny water droplets or ice crystals that are less dense than the surrounding air. This lower density causes the clouds to float or remain suspended in the atmosphere. Temperature (A), velocity (B), and pressure (C) can influence cloud formation and movement but are not the primary reasons for their floating. Density, on the other hand, directly affects the buoyancy of clouds, as they rise and fall within the atmosphere based on changes in temperature and pressure gradients. Thus, clouds float due to their lower density compared to the surrounding air, making option (D) the correct choice for explaining the phenomenon of cloud floating in the atmosphere.
Approximately 1/10 part of an iceberg floating in the sea remains above the surface of the sea (B). This is due to Archimedes' principle, which states that the buoyant force acting on a submerged object is equal to the weight of the fluid displaced by the object. Icebergs are made of freshwater ice,Read more
Approximately 1/10 part of an iceberg floating in the sea remains above the surface of the sea (B). This is due to Archimedes’ principle, which states that the buoyant force acting on a submerged object is equal to the weight of the fluid displaced by the object. Icebergs are made of freshwater ice, which has a density of about 0.92 g/cm³, while seawater has a density of about 1.025 g/cm³. Because the density of ice is lower than that of seawater, only about 1/10 of the iceberg’s volume is above the surface, while the rest is submerged. This ratio can vary depending on factors such as the iceberg’s shape and density distribution. Option (B) 1/10 accurately represents this fraction, making it the correct answer.
The wall below the dam is made thick because the pressure of the fluid increases with increasing depth (A). This is due to the weight of the fluid above exerting a force on the lower levels. A thicker wall is needed to withstand the greater force exerted by the fluid against it as the depth increaseRead more
The wall below the dam is made thick because the pressure of the fluid increases with increasing depth (A). This is due to the weight of the fluid above exerting a force on the lower levels. A thicker wall is needed to withstand the greater force exerted by the fluid against it as the depth increases. This principle is described by Pascal’s law, which states that pressure applied to a fluid in a confined space is transmitted undiminished throughout the fluid. Therefore, as the depth below the dam increases, the pressure exerted by the water against the wall also increases. Option (A) accurately reflects this relationship between pressure and depth, making it the correct choice for explaining the necessity of a thick wall below the dam.
Skating on ice shows that on increasing the pressure, the melting point of ice decreases (B). When pressure is applied by the skater's weight, it lowers the melting point of the ice underneath the skate blades. This occurs because pressure causes the ice molecules to come closer together, making itRead more
Skating on ice shows that on increasing the pressure, the melting point of ice decreases (B). When pressure is applied by the skater’s weight, it lowers the melting point of the ice underneath the skate blades. This occurs because pressure causes the ice molecules to come closer together, making it harder for them to maintain their solid structure. As a result, the ice briefly melts, forming a thin layer of water between the skate blades and the ice surface. This reduced melting point allows for easier gliding of the skates on the ice. Option (B) accurately reflects this phenomenon, indicating that the melting point of ice decreases under increased pressure, making it the correct choice to explain the observation of skating on ice.
Why does a swimmer find it easier to swim in sea water than in river?
A swimmer finds it easier to swim in seawater than in a river because the density of seawater is higher than that of ordinary water (C). Higher density in seawater provides more buoyant force, allowing the swimmer to float more easily and requiring less effort to stay afloat. This increased buoyancyRead more
A swimmer finds it easier to swim in seawater than in a river because the density of seawater is higher than that of ordinary water (C). Higher density in seawater provides more buoyant force, allowing the swimmer to float more easily and requiring less effort to stay afloat. This increased buoyancy aids in maintaining proper body positioning and reduces the risk of sinking. Additionally, the salt content in seawater contributes to increased buoyancy compared to freshwater. Options (A), (B), and (D) are irrelevant to the ease of swimming in seawater and do not address the specific physical properties that make swimming easier, such as buoyancy. Therefore, the correct option is (C) The density of seawater is higher than that of ordinary water.
See lessThe reason for floating of clouds in the atmosphere is
The reason for the floating of clouds in the atmosphere is density (D). Clouds consist of tiny water droplets or ice crystals that are less dense than the surrounding air. This lower density causes the clouds to float or remain suspended in the atmosphere. Temperature (A), velocity (B), and pressureRead more
The reason for the floating of clouds in the atmosphere is density (D). Clouds consist of tiny water droplets or ice crystals that are less dense than the surrounding air. This lower density causes the clouds to float or remain suspended in the atmosphere. Temperature (A), velocity (B), and pressure (C) can influence cloud formation and movement but are not the primary reasons for their floating. Density, on the other hand, directly affects the buoyancy of clouds, as they rise and fall within the atmosphere based on changes in temperature and pressure gradients. Thus, clouds float due to their lower density compared to the surrounding air, making option (D) the correct choice for explaining the phenomenon of cloud floating in the atmosphere.
See lessHow much part of the iceberg floating in the sea remains above the surface of the sea?
Approximately 1/10 part of an iceberg floating in the sea remains above the surface of the sea (B). This is due to Archimedes' principle, which states that the buoyant force acting on a submerged object is equal to the weight of the fluid displaced by the object. Icebergs are made of freshwater ice,Read more
Approximately 1/10 part of an iceberg floating in the sea remains above the surface of the sea (B). This is due to Archimedes’ principle, which states that the buoyant force acting on a submerged object is equal to the weight of the fluid displaced by the object. Icebergs are made of freshwater ice, which has a density of about 0.92 g/cm³, while seawater has a density of about 1.025 g/cm³. Because the density of ice is lower than that of seawater, only about 1/10 of the iceberg’s volume is above the surface, while the rest is submerged. This ratio can vary depending on factors such as the iceberg’s shape and density distribution. Option (B) 1/10 accurately represents this fraction, making it the correct answer.
See lessThe wall below the dam is made thick because
The wall below the dam is made thick because the pressure of the fluid increases with increasing depth (A). This is due to the weight of the fluid above exerting a force on the lower levels. A thicker wall is needed to withstand the greater force exerted by the fluid against it as the depth increaseRead more
The wall below the dam is made thick because the pressure of the fluid increases with increasing depth (A). This is due to the weight of the fluid above exerting a force on the lower levels. A thicker wall is needed to withstand the greater force exerted by the fluid against it as the depth increases. This principle is described by Pascal’s law, which states that pressure applied to a fluid in a confined space is transmitted undiminished throughout the fluid. Therefore, as the depth below the dam increases, the pressure exerted by the water against the wall also increases. Option (A) accurately reflects this relationship between pressure and depth, making it the correct choice for explaining the necessity of a thick wall below the dam.
See lessSkating on ice shows that on increasing the pressure the melting point of ice
Skating on ice shows that on increasing the pressure, the melting point of ice decreases (B). When pressure is applied by the skater's weight, it lowers the melting point of the ice underneath the skate blades. This occurs because pressure causes the ice molecules to come closer together, making itRead more
Skating on ice shows that on increasing the pressure, the melting point of ice decreases (B). When pressure is applied by the skater’s weight, it lowers the melting point of the ice underneath the skate blades. This occurs because pressure causes the ice molecules to come closer together, making it harder for them to maintain their solid structure. As a result, the ice briefly melts, forming a thin layer of water between the skate blades and the ice surface. This reduced melting point allows for easier gliding of the skates on the ice. Option (B) accurately reflects this phenomenon, indicating that the melting point of ice decreases under increased pressure, making it the correct choice to explain the observation of skating on ice.
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