For a steel boat floating in a lake, the weight of water displaced by the boat is equal to the weight of that part of the boat which is below the surface of the water of the lake (C). This principle is known as Archimedes' principle. When an object is immersed in a fluid, it displaces an amount of fRead more
For a steel boat floating in a lake, the weight of water displaced by the boat is equal to the weight of that part of the boat which is below the surface of the water of the lake (C). This principle is known as Archimedes’ principle. When an object is immersed in a fluid, it displaces an amount of fluid equal to its own weight. In the case of a floating boat, the buoyant force exerted by the displaced water balances the weight of the boat, allowing it to float. This equilibrium occurs because the boat displaces a volume of water equal to its own weight, ensuring that the weight of the water displaced is equal to the weight of the boat. Therefore, the correct option is (C) Equal to the weight of that part of the boat which is below the surface of the water of the lake.
Cleaning a carpet by beating it with a stick follows the third law of motion (C). According to Newton's third law, for every action, there is an equal and opposite reaction. When the stick strikes the carpet, it exerts a force on the carpet. Simultaneously, the carpet exerts an equal and opposite reRead more
Cleaning a carpet by beating it with a stick follows the third law of motion (C). According to Newton’s third law, for every action, there is an equal and opposite reaction. When the stick strikes the carpet, it exerts a force on the carpet. Simultaneously, the carpet exerts an equal and opposite reaction force on the stick. This reaction force dislodges dust and debris from the carpet fibers, aiding in the cleaning process. The first law of motion (A) states that an object will remain at rest or in uniform motion unless acted upon by an external force, which is not applicable in this scenario. The second law of motion (B) describes the relationship between force, mass, and acceleration, but it doesn’t directly apply to the action of beating a carpet with a stick. Therefore, the correct option is (C) Third law of motion.
Walking on snow is more difficult than walking on the road because there is less friction in snow than on the road (D). Friction between the shoe and the ground helps maintain stability and allows for efficient walking. Snow has a lower coefficient of friction compared to the road surface, making itRead more
Walking on snow is more difficult than walking on the road because there is less friction in snow than on the road (D). Friction between the shoe and the ground helps maintain stability and allows for efficient walking. Snow has a lower coefficient of friction compared to the road surface, making it harder to gain traction and causing slipping. Additionally, the uneven and soft nature of snow further reduces stability and increases the effort required to walk. Option (A) is incorrect because snow is generally softer than the road surface. Option (B) is also incorrect as it suggests that the road is harder than snow, which isn’t the case. Option (C) is inaccurate because snow does react when force is applied, albeit with less resistance due to its softer texture. Therefore, the correct option is (D) There is less friction in snow than on the road.
It is easier to roll a wooden cylindrical barrel instead of pulling it because the friction force of rolling state is much less than the friction force of sliding state (B). When the barrel rolls, only a small portion of its surface area is in contact with the ground at any given time, reducing fricRead more
It is easier to roll a wooden cylindrical barrel instead of pulling it because the friction force of rolling state is much less than the friction force of sliding state (B). When the barrel rolls, only a small portion of its surface area is in contact with the ground at any given time, reducing friction. In contrast, when pulled, the entire bottom surface of the barrel is in contact with the ground, resulting in higher friction. Option (A) is incorrect because the weight of the object is effective regardless of whether it’s rolled or pulled. Option (C) is also incorrect because the surface area of the barrel in contact with the road doesn’t affect the friction force. Therefore, the correct option is (B) The friction force of rolling state is much less than the friction force of sliding state.
When a ship sailing in a river reaches the sea, the level of the ship will fall slightly (C). This occurs because seawater is denser than river water. As the ship transitions from less dense river water to denser seawater, the buoyant force decreases slightly, causing the ship's level to lower. OptiRead more
When a ship sailing in a river reaches the sea, the level of the ship will fall slightly (C). This occurs because seawater is denser than river water. As the ship transitions from less dense river water to denser seawater, the buoyant force decreases slightly, causing the ship’s level to lower. Options (A), (B), and (D) are incorrect. The ship’s level cannot remain the same (A) or rise slightly (B) because of the denser seawater. Option (D) is incorrect because the change in the ship’s level is primarily due to the change in the surrounding water’s density, not the weight lying in the ship. Therefore, the correct option is (C) fall slightly.
An iron nail floats in mercury, whereas it sinks in water because the density of iron is more than that of water and less than that of mercury (C). Density is the mass of a substance per unit volume. Iron has a higher density than water but a lower density than mercury. Therefore, when placed in merRead more
An iron nail floats in mercury, whereas it sinks in water because the density of iron is more than that of water and less than that of mercury (C). Density is the mass of a substance per unit volume. Iron has a higher density than water but a lower density than mercury. Therefore, when placed in mercury, which is denser than water, the iron nail displaces less mercury than its own weight, allowing it to float. In water, however, the iron nail displaces less water than its own weight, causing it to sink. Options (A) and (D) are incorrect because they do not explain the phenomenon of flotation based on density. Option (B) is also incorrect because it focuses solely on weight, disregarding the role of density. Therefore, the correct option is (C) The density of iron is more than that of water and less than that of mercury.
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.
For a steel boat floating in a lake, what is the weight of water displaced by the boat?
For a steel boat floating in a lake, the weight of water displaced by the boat is equal to the weight of that part of the boat which is below the surface of the water of the lake (C). This principle is known as Archimedes' principle. When an object is immersed in a fluid, it displaces an amount of fRead more
For a steel boat floating in a lake, the weight of water displaced by the boat is equal to the weight of that part of the boat which is below the surface of the water of the lake (C). This principle is known as Archimedes’ principle. When an object is immersed in a fluid, it displaces an amount of fluid equal to its own weight. In the case of a floating boat, the buoyant force exerted by the displaced water balances the weight of the boat, allowing it to float. This equilibrium occurs because the boat displaces a volume of water equal to its own weight, ensuring that the weight of the water displaced is equal to the weight of the boat. Therefore, the correct option is (C) Equal to the weight of that part of the boat which is below the surface of the water of the lake.
See lessWhich rule applies to cleaning a carpet if it is beaten with a stick?
Cleaning a carpet by beating it with a stick follows the third law of motion (C). According to Newton's third law, for every action, there is an equal and opposite reaction. When the stick strikes the carpet, it exerts a force on the carpet. Simultaneously, the carpet exerts an equal and opposite reRead more
Cleaning a carpet by beating it with a stick follows the third law of motion (C). According to Newton’s third law, for every action, there is an equal and opposite reaction. When the stick strikes the carpet, it exerts a force on the carpet. Simultaneously, the carpet exerts an equal and opposite reaction force on the stick. This reaction force dislodges dust and debris from the carpet fibers, aiding in the cleaning process. The first law of motion (A) states that an object will remain at rest or in uniform motion unless acted upon by an external force, which is not applicable in this scenario. The second law of motion (B) describes the relationship between force, mass, and acceleration, but it doesn’t directly apply to the action of beating a carpet with a stick. Therefore, the correct option is (C) Third law of motion.
See lessWalking on snow is more difficult than walking on the road, because
Walking on snow is more difficult than walking on the road because there is less friction in snow than on the road (D). Friction between the shoe and the ground helps maintain stability and allows for efficient walking. Snow has a lower coefficient of friction compared to the road surface, making itRead more
Walking on snow is more difficult than walking on the road because there is less friction in snow than on the road (D). Friction between the shoe and the ground helps maintain stability and allows for efficient walking. Snow has a lower coefficient of friction compared to the road surface, making it harder to gain traction and causing slipping. Additionally, the uneven and soft nature of snow further reduces stability and increases the effort required to walk. Option (A) is incorrect because snow is generally softer than the road surface. Option (B) is also incorrect as it suggests that the road is harder than snow, which isn’t the case. Option (C) is inaccurate because snow does react when force is applied, albeit with less resistance due to its softer texture. Therefore, the correct option is (D) There is less friction in snow than on the road.
See lessIt is easier to roll a wooden cylindrical barrel instead of pulling it, because
It is easier to roll a wooden cylindrical barrel instead of pulling it because the friction force of rolling state is much less than the friction force of sliding state (B). When the barrel rolls, only a small portion of its surface area is in contact with the ground at any given time, reducing fricRead more
It is easier to roll a wooden cylindrical barrel instead of pulling it because the friction force of rolling state is much less than the friction force of sliding state (B). When the barrel rolls, only a small portion of its surface area is in contact with the ground at any given time, reducing friction. In contrast, when pulled, the entire bottom surface of the barrel is in contact with the ground, resulting in higher friction. Option (A) is incorrect because the weight of the object is effective regardless of whether it’s rolled or pulled. Option (C) is also incorrect because the surface area of the barrel in contact with the road doesn’t affect the friction force. Therefore, the correct option is (B) The friction force of rolling state is much less than the friction force of sliding state.
See lessWhen a ship sailing in a river reaches the sea, the level of the ship will
When a ship sailing in a river reaches the sea, the level of the ship will fall slightly (C). This occurs because seawater is denser than river water. As the ship transitions from less dense river water to denser seawater, the buoyant force decreases slightly, causing the ship's level to lower. OptiRead more
When a ship sailing in a river reaches the sea, the level of the ship will fall slightly (C). This occurs because seawater is denser than river water. As the ship transitions from less dense river water to denser seawater, the buoyant force decreases slightly, causing the ship’s level to lower. Options (A), (B), and (D) are incorrect. The ship’s level cannot remain the same (A) or rise slightly (B) because of the denser seawater. Option (D) is incorrect because the change in the ship’s level is primarily due to the change in the surrounding water’s density, not the weight lying in the ship. Therefore, the correct option is (C) fall slightly.
See lessWhy does an iron nail float in mercury, whereas it sinks in water?
An iron nail floats in mercury, whereas it sinks in water because the density of iron is more than that of water and less than that of mercury (C). Density is the mass of a substance per unit volume. Iron has a higher density than water but a lower density than mercury. Therefore, when placed in merRead more
An iron nail floats in mercury, whereas it sinks in water because the density of iron is more than that of water and less than that of mercury (C). Density is the mass of a substance per unit volume. Iron has a higher density than water but a lower density than mercury. Therefore, when placed in mercury, which is denser than water, the iron nail displaces less mercury than its own weight, allowing it to float. In water, however, the iron nail displaces less water than its own weight, causing it to sink. Options (A) and (D) are incorrect because they do not explain the phenomenon of flotation based on density. Option (B) is also incorrect because it focuses solely on weight, disregarding the role of density. Therefore, the correct option is (C) The density of iron is more than that of water and less than that of mercury.
See lessWhen 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 less