When a solid body is immersed in water, its weight decreases. This loss is equal to the weight of displaced water (A). Archimedes' principle states that the buoyant force acting on a submerged object is equal to the weight of the displaced fluid. Therefore, the weight loss of the solid body when immRead more
When a solid body is immersed in water, its weight decreases. This loss is equal to the weight of displaced water (A). Archimedes’ principle states that the buoyant force acting on a submerged object is equal to the weight of the displaced fluid. Therefore, the weight loss of the solid body when immersed in water is precisely equal to the weight of the water it displaces. This principle applies regardless of the shape or material of the submerged object. Options (B), (C), and (D) are incorrect because they do not align with Archimedes’ principle, which clearly establishes the relationship between the weight loss of a submerged object and the weight of the displaced water. Therefore, the correct option is (A) Equal to the weight of displaced water.
Ice floats in water, but sinks in alcohol because ice is lighter than water and heavier than alcohol (D). This phenomenon is governed by Archimedes' principle, which states that a floating object displaces a volume of fluid equal to its own weight. Ice has a lower density than water, so it displacesRead more
Ice floats in water, but sinks in alcohol because ice is lighter than water and heavier than alcohol (D). This phenomenon is governed by Archimedes’ principle, which states that a floating object displaces a volume of fluid equal to its own weight. Ice has a lower density than water, so it displaces its weight in water, causing it to float. In contrast, ice has a higher density than alcohol, so it cannot displace its weight in alcohol, causing it to sink. Options (A), (B), and (C) are unrelated to the buoyancy of ice in water and alcohol and do not explain the observed phenomenon. Therefore, the correct option is (D) Ice is lighter than water and heavier than alcohol, as it accurately describes the density relationship responsible for the behavior of ice in different liquids.
The density of water is maximum at 4 °C (A). At this temperature, water molecules arrange themselves in a highly ordered structure due to hydrogen bonding. This arrangement allows for the closest packing of molecules, resulting in the highest density. As the temperature deviates from 4 °C, the densiRead more
The density of water is maximum at 4 °C (A). At this temperature, water molecules arrange themselves in a highly ordered structure due to hydrogen bonding. This arrangement allows for the closest packing of molecules, resulting in the highest density. As the temperature deviates from 4 °C, the density of water decreases. Options (B), (C), and (D) are incorrect. Kelvin temperature (K) is an absolute scale, where 4 K is equivalent to -269.15 °C, far below the maximum density temperature of water. Fahrenheit temperature (°F) is a different scale, not relevant to the maximum density of water. Option (D) represents a negative temperature, which is not meaningful in this context. Therefore, the correct option is (A) 4 °C, as it corresponds to the temperature at which water exhibits its maximum density due to the specific arrangement of its molecules.
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.
The ball keeps dancing in the water spray at intersections because due to higher velocity of water, pressure becomes higher (B). As the water exits the nozzle at high speed, its kinetic energy increases, resulting in an increase in pressure according to Bernoulli's principle. This higher pressure arRead more
The ball keeps dancing in the water spray at intersections because due to higher velocity of water, pressure becomes higher (B). As the water exits the nozzle at high speed, its kinetic energy increases, resulting in an increase in pressure according to Bernoulli’s principle. This higher pressure around the ball creates a force that propels it and causes it to dance in the spray. Options (A), (C), and (D) are not relevant to the phenomenon described. Surface tension (C) typically refers to the cohesive forces between liquid molecules at the surface, not applicable to the situation. Viscosity (D) relates to a fluid’s resistance to flow, which does not directly influence the ball’s dancing behavior. Therefore, option (B) accurately explains the mechanism behind the ball’s movement in the water spray at intersections.
A heavy iceberg melts at the bottom rather than the top because the melting point decreases due to the pressure of the lower layer being higher (B). As the weight of the iceberg compresses the lower layers, the pressure increases, lowering the melting point of ice according to the principle of pressRead more
A heavy iceberg melts at the bottom rather than the top because the melting point decreases due to the pressure of the lower layer being higher (B). As the weight of the iceberg compresses the lower layers, the pressure increases, lowering the melting point of ice according to the principle of pressure melting. This causes the ice at the bottom to melt first, despite the fact that the temperature may be colder at greater depths. Options (A) and (C) are incorrect as they do not accurately explain the phenomenon. While the temperature gradient within the iceberg may play a role, it is primarily the pressure-induced decrease in melting point that causes bottom-up melting in heavy icebergs. Therefore, option (B) provides the most appropriate explanation for why heavy icebergs melt at the bottom.
When a solid body is immersed in water, its weight decreases. How much is this loss?
When a solid body is immersed in water, its weight decreases. This loss is equal to the weight of displaced water (A). Archimedes' principle states that the buoyant force acting on a submerged object is equal to the weight of the displaced fluid. Therefore, the weight loss of the solid body when immRead more
When a solid body is immersed in water, its weight decreases. This loss is equal to the weight of displaced water (A). Archimedes’ principle states that the buoyant force acting on a submerged object is equal to the weight of the displaced fluid. Therefore, the weight loss of the solid body when immersed in water is precisely equal to the weight of the water it displaces. This principle applies regardless of the shape or material of the submerged object. Options (B), (C), and (D) are incorrect because they do not align with Archimedes’ principle, which clearly establishes the relationship between the weight loss of a submerged object and the weight of the displaced water. Therefore, the correct option is (A) Equal to the weight of displaced water.
See lessIce floats in water, but sinks in alcohol. Because
Ice floats in water, but sinks in alcohol because ice is lighter than water and heavier than alcohol (D). This phenomenon is governed by Archimedes' principle, which states that a floating object displaces a volume of fluid equal to its own weight. Ice has a lower density than water, so it displacesRead more
Ice floats in water, but sinks in alcohol because ice is lighter than water and heavier than alcohol (D). This phenomenon is governed by Archimedes’ principle, which states that a floating object displaces a volume of fluid equal to its own weight. Ice has a lower density than water, so it displaces its weight in water, causing it to float. In contrast, ice has a higher density than alcohol, so it cannot displace its weight in alcohol, causing it to sink. Options (A), (B), and (C) are unrelated to the buoyancy of ice in water and alcohol and do not explain the observed phenomenon. Therefore, the correct option is (D) Ice is lighter than water and heavier than alcohol, as it accurately describes the density relationship responsible for the behavior of ice in different liquids.
See lessThe density of water is maximum at
The density of water is maximum at 4 °C (A). At this temperature, water molecules arrange themselves in a highly ordered structure due to hydrogen bonding. This arrangement allows for the closest packing of molecules, resulting in the highest density. As the temperature deviates from 4 °C, the densiRead more
The density of water is maximum at 4 °C (A). At this temperature, water molecules arrange themselves in a highly ordered structure due to hydrogen bonding. This arrangement allows for the closest packing of molecules, resulting in the highest density. As the temperature deviates from 4 °C, the density of water decreases. Options (B), (C), and (D) are incorrect. Kelvin temperature (K) is an absolute scale, where 4 K is equivalent to -269.15 °C, far below the maximum density temperature of water. Fahrenheit temperature (°F) is a different scale, not relevant to the maximum density of water. Option (D) represents a negative temperature, which is not meaningful in this context. Therefore, the correct option is (A) 4 °C, as it corresponds to the temperature at which water exhibits its maximum density due to the specific arrangement of its molecules.
See lessWhy 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.
See lessThe ball keeps dancing in the water spray at intersections because
The ball keeps dancing in the water spray at intersections because due to higher velocity of water, pressure becomes higher (B). As the water exits the nozzle at high speed, its kinetic energy increases, resulting in an increase in pressure according to Bernoulli's principle. This higher pressure arRead more
The ball keeps dancing in the water spray at intersections because due to higher velocity of water, pressure becomes higher (B). As the water exits the nozzle at high speed, its kinetic energy increases, resulting in an increase in pressure according to Bernoulli’s principle. This higher pressure around the ball creates a force that propels it and causes it to dance in the spray. Options (A), (C), and (D) are not relevant to the phenomenon described. Surface tension (C) typically refers to the cohesive forces between liquid molecules at the surface, not applicable to the situation. Viscosity (D) relates to a fluid’s resistance to flow, which does not directly influence the ball’s dancing behavior. Therefore, option (B) accurately explains the mechanism behind the ball’s movement in the water spray at intersections.
See lessA heavy iceberg melts at the bottom rather than the top, because
A heavy iceberg melts at the bottom rather than the top because the melting point decreases due to the pressure of the lower layer being higher (B). As the weight of the iceberg compresses the lower layers, the pressure increases, lowering the melting point of ice according to the principle of pressRead more
A heavy iceberg melts at the bottom rather than the top because the melting point decreases due to the pressure of the lower layer being higher (B). As the weight of the iceberg compresses the lower layers, the pressure increases, lowering the melting point of ice according to the principle of pressure melting. This causes the ice at the bottom to melt first, despite the fact that the temperature may be colder at greater depths. Options (A) and (C) are incorrect as they do not accurately explain the phenomenon. While the temperature gradient within the iceberg may play a role, it is primarily the pressure-induced decrease in melting point that causes bottom-up melting in heavy icebergs. Therefore, option (B) provides the most appropriate explanation for why heavy icebergs melt at the bottom.
See less