A solar eclipse occurs on a new moon day (Pratipada), which corresponds to option [A]. During this celestial event, the Moon moves directly between the Sun and Earth, aligning in such a way that its shadow falls on Earth's surface. This alignment blocks all or part of the Sun's light, creating a temRead more
A solar eclipse occurs on a new moon day (Pratipada), which corresponds to option [A]. During this celestial event, the Moon moves directly between the Sun and Earth, aligning in such a way that its shadow falls on Earth’s surface. This alignment blocks all or part of the Sun’s light, creating a temporary darkening of the sky during the day. Solar eclipses can be total, partial, or annular, depending on the alignment and distances between the Sun, Moon, and Earth. A total solar eclipse occurs when the Moon completely covers the Sun’s disk, a partial solar eclipse occurs when only part of the Sun is obscured, and an annular solar eclipse occurs when the Moon is too far from Earth to completely cover the Sun, leaving a ring (annulus) of sunlight visible around the Moon’s edges. Solar eclipses are dramatic astronomical events that occur periodically as the Moon orbits Earth and aligns with the Sun in its orbit.
A cricket player catches a fast-moving ball by pulling his hand back primarily because it may require applying less force (C). By doing so, the player extends the duration of contact with the ball, which reduces the impact force on the hand. This technique allows for better control and absorption ofRead more
A cricket player catches a fast-moving ball by pulling his hand back primarily because it may require applying less force (C). By doing so, the player extends the duration of contact with the ball, which reduces the impact force on the hand. This technique allows for better control and absorption of the ball’s momentum, increasing the likelihood of a successful catch. Additionally, pulling the hand back enables the player to cushion the impact more effectively, minimizing the risk of injury. This method also facilitates adjustments in hand positioning to intercept the ball’s trajectory accurately. Moreover, by reducing the rebound effect, the player can secure the catch more reliably. Overall, pulling the hand back is a strategic approach that enhances catching proficiency, contributes to team performance, and reduces the chance of mishaps during intense gameplay.
Force is the product of mass and acceleration (B). Newton's second law of motion states that force equals mass times acceleration (F = ma). This law describes how the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In simpler tRead more
Force is the product of mass and acceleration (B). Newton’s second law of motion states that force equals mass times acceleration (F = ma). This law describes how the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In simpler terms, the greater the mass of an object and the greater the acceleration applied to it, the greater the force exerted. Velocity is the rate of change of displacement, while weight is the force exerted on an object due to gravity. However, force is specifically determined by the mass of an object and the rate at which its velocity changes, which is represented by acceleration. Therefore, the correct option is mass and acceleration (B).
When a person lands on the Moon, there is a change in weight (C). Weight is the force exerted on an object due to gravity, and since the Moon has less gravity than Earth, the person's weight decreases. However, their mass remains unchanged. Mass is a measure of the amount of matter in an object, andRead more
When a person lands on the Moon, there is a change in weight (C). Weight is the force exerted on an object due to gravity, and since the Moon has less gravity than Earth, the person’s weight decreases. However, their mass remains unchanged. Mass is a measure of the amount of matter in an object, and it remains constant regardless of the gravitational field. Therefore, while the person experiences a decrease in weight due to the weaker gravitational pull of the Moon, their mass remains the same as it was on Earth. This change in weight occurs because weight is directly proportional to the gravitational acceleration experienced by the person, which is significantly less on the Moon compared to Earth.
As we move from the equator towards the poles, the value of g decreases (B). This is due to the centrifugal force caused by Earth's rotation, which is greatest at the equator and decreases towards the poles. Additionally, the shape of the Earth is not a perfect sphere; it's slightly flattened at theRead more
As we move from the equator towards the poles, the value of g decreases (B). This is due to the centrifugal force caused by Earth’s rotation, which is greatest at the equator and decreases towards the poles. Additionally, the shape of the Earth is not a perfect sphere; it’s slightly flattened at the poles and bulging at the equator. This variation in distance from the Earth’s center also affects the gravitational force. As we move towards the poles, we are closer to the Earth’s center, resulting in a stronger gravitational force. However, this increase is offset by the decrease in centrifugal force, leading to a net decrease in the value of g. This decrease is not constant but varies gradually as we move from the equator towards the poles, reaching its maximum value at the poles. Therefore, the correct option is (B) decreases.
Body weight varies with location on Earth's surface due to differences in gravitational acceleration. It is not the same everywhere on Earth's surface. At the poles (B), gravity is stronger because objects are closer to the Earth's center. At the equator, the centrifugal force caused by Earth's rotaRead more
Body weight varies with location on Earth’s surface due to differences in gravitational acceleration. It is not the same everywhere on Earth’s surface. At the poles (B), gravity is stronger because objects are closer to the Earth’s center. At the equator, the centrifugal force caused by Earth’s rotation counteracts some of the gravitational force, resulting in slightly lower weight. Therefore, body weight is maximum at the poles and slightly lower at the equator. Additionally, weight can vary with altitude. On hills (D), the distance from the Earth’s center is slightly greater compared to plains, resulting in slightly lower weight. However, this difference is generally negligible unless at extreme altitudes. Thus, body weight is not the same everywhere, being maximum at the poles and slightly lower at the equator.
An astronaut can jump higher on the lunar surface than on the Earth's surface because the force of gravity on the lunar surface is much less compared to the Earth's surface (C). This weaker gravity allows the astronaut to exert less downward force on the lunar surface, enabling them to achieve greatRead more
An astronaut can jump higher on the lunar surface than on the Earth’s surface because the force of gravity on the lunar surface is much less compared to the Earth’s surface (C). This weaker gravity allows the astronaut to exert less downward force on the lunar surface, enabling them to achieve greater height in their jump. While the astronaut is not weightless on the Moon (A), there is less gravitational pull due to the Moon’s smaller mass (D), but this difference primarily accounts for the discrepancy in weight, not the ability to jump higher. The absence of atmosphere on the Moon (B) does not significantly affect the astronaut’s ability to jump higher, as it primarily influences air resistance rather than gravitational force. Thus, the correct option is (C) The force of gravity on the lunar surface is very less as compared to the Earth’s surface.
The work done to hold a weight of 20 kg at a height of 1 m above the ground is zero Joules (D). Work is defined as the product of force and displacement in the direction of the force. When holding an object stationary, like in this scenario, there is no displacement; thus, no work is done against grRead more
The work done to hold a weight of 20 kg at a height of 1 m above the ground is zero Joules (D). Work is defined as the product of force and displacement in the direction of the force. When holding an object stationary, like in this scenario, there is no displacement; thus, no work is done against gravity. While the weight of the object is 20 kg, and the force due to gravity is approximately 9.81 m/s² (981 N/kg), the vertical displacement is zero since the object is held at a constant height. Therefore, the work done is zero. Options (A), (B), and (C) are incorrect because they imply that work is being done, but in reality, no displacement occurs when holding the weight stationary at a constant height above the ground.
If a person pushes a wall but fails to displace it, then he does no work (A). In physics, work is defined as the product of force and displacement in the direction of the force. When there is no displacement, regardless of the magnitude of the force applied, the work done is zero. Even though the peRead more
If a person pushes a wall but fails to displace it, then he does no work (A). In physics, work is defined as the product of force and displacement in the direction of the force. When there is no displacement, regardless of the magnitude of the force applied, the work done is zero. Even though the person exerts force against the wall, if the wall does not move, there is no change in the wall’s position, and hence no work is accomplished. Option (B) is incorrect because negative work implies that energy is being taken away from the system, which doesn’t apply here. Option (C) implies some positive work, but there’s no work done if there’s no displacement. Option (D) is incorrect because maximum work would imply achieving the greatest possible displacement, which isn’t the case if the wall remains stationary. Therefore, the correct option is (A) No work.
A person climbing a hill leans forward to increase stability (D). Leaning forward shifts the center of mass towards the hillside, enhancing balance and reducing the risk of falling backward. This posture allows the individual to maintain a more stable foothold, minimizing the chance of slipping. AddRead more
A person climbing a hill leans forward to increase stability (D). Leaning forward shifts the center of mass towards the hillside, enhancing balance and reducing the risk of falling backward. This posture allows the individual to maintain a more stable foothold, minimizing the chance of slipping. Additionally, leaning forward enables better utilization of leg muscles, providing more power for propulsion uphill. It also reduces the strain on the back by distributing the load more evenly across the body. While leaning forward may contribute to a perception of increased speed, its primary purpose is to enhance stability and safety during the ascent. Therefore, the correct option is (D) to increase stability, as it aligns with the biomechanical advantages and safety considerations associated with leaning forward while climbing a hill.
When does solar eclipse occur on?
A solar eclipse occurs on a new moon day (Pratipada), which corresponds to option [A]. During this celestial event, the Moon moves directly between the Sun and Earth, aligning in such a way that its shadow falls on Earth's surface. This alignment blocks all or part of the Sun's light, creating a temRead more
A solar eclipse occurs on a new moon day (Pratipada), which corresponds to option [A]. During this celestial event, the Moon moves directly between the Sun and Earth, aligning in such a way that its shadow falls on Earth’s surface. This alignment blocks all or part of the Sun’s light, creating a temporary darkening of the sky during the day. Solar eclipses can be total, partial, or annular, depending on the alignment and distances between the Sun, Moon, and Earth. A total solar eclipse occurs when the Moon completely covers the Sun’s disk, a partial solar eclipse occurs when only part of the Sun is obscured, and an annular solar eclipse occurs when the Moon is too far from Earth to completely cover the Sun, leaving a ring (annulus) of sunlight visible around the Moon’s edges. Solar eclipses are dramatic astronomical events that occur periodically as the Moon orbits Earth and aligns with the Sun in its orbit.
See lessWhy does a cricket player catch a fast-moving ball by pulling his hand back?
A cricket player catches a fast-moving ball by pulling his hand back primarily because it may require applying less force (C). By doing so, the player extends the duration of contact with the ball, which reduces the impact force on the hand. This technique allows for better control and absorption ofRead more
A cricket player catches a fast-moving ball by pulling his hand back primarily because it may require applying less force (C). By doing so, the player extends the duration of contact with the ball, which reduces the impact force on the hand. This technique allows for better control and absorption of the ball’s momentum, increasing the likelihood of a successful catch. Additionally, pulling the hand back enables the player to cushion the impact more effectively, minimizing the risk of injury. This method also facilitates adjustments in hand positioning to intercept the ball’s trajectory accurately. Moreover, by reducing the rebound effect, the player can secure the catch more reliably. Overall, pulling the hand back is a strategic approach that enhances catching proficiency, contributes to team performance, and reduces the chance of mishaps during intense gameplay.
See lessForce is the product of
Force is the product of mass and acceleration (B). Newton's second law of motion states that force equals mass times acceleration (F = ma). This law describes how the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In simpler tRead more
Force is the product of mass and acceleration (B). Newton’s second law of motion states that force equals mass times acceleration (F = ma). This law describes how the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. In simpler terms, the greater the mass of an object and the greater the acceleration applied to it, the greater the force exerted. Velocity is the rate of change of displacement, while weight is the force exerted on an object due to gravity. However, force is specifically determined by the mass of an object and the rate at which its velocity changes, which is represented by acceleration. Therefore, the correct option is mass and acceleration (B).
See lessWhen a person lands on the Moon, in his body
When a person lands on the Moon, there is a change in weight (C). Weight is the force exerted on an object due to gravity, and since the Moon has less gravity than Earth, the person's weight decreases. However, their mass remains unchanged. Mass is a measure of the amount of matter in an object, andRead more
When a person lands on the Moon, there is a change in weight (C). Weight is the force exerted on an object due to gravity, and since the Moon has less gravity than Earth, the person’s weight decreases. However, their mass remains unchanged. Mass is a measure of the amount of matter in an object, and it remains constant regardless of the gravitational field. Therefore, while the person experiences a decrease in weight due to the weaker gravitational pull of the Moon, their mass remains the same as it was on Earth. This change in weight occurs because weight is directly proportional to the gravitational acceleration experienced by the person, which is significantly less on the Moon compared to Earth.
See lessIf we move from the equator towards the poles, the value of g
As we move from the equator towards the poles, the value of g decreases (B). This is due to the centrifugal force caused by Earth's rotation, which is greatest at the equator and decreases towards the poles. Additionally, the shape of the Earth is not a perfect sphere; it's slightly flattened at theRead more
As we move from the equator towards the poles, the value of g decreases (B). This is due to the centrifugal force caused by Earth’s rotation, which is greatest at the equator and decreases towards the poles. Additionally, the shape of the Earth is not a perfect sphere; it’s slightly flattened at the poles and bulging at the equator. This variation in distance from the Earth’s center also affects the gravitational force. As we move towards the poles, we are closer to the Earth’s center, resulting in a stronger gravitational force. However, this increase is offset by the decrease in centrifugal force, leading to a net decrease in the value of g. This decrease is not constant but varies gradually as we move from the equator towards the poles, reaching its maximum value at the poles. Therefore, the correct option is (B) decreases.
See lessBody weight is the
Body weight varies with location on Earth's surface due to differences in gravitational acceleration. It is not the same everywhere on Earth's surface. At the poles (B), gravity is stronger because objects are closer to the Earth's center. At the equator, the centrifugal force caused by Earth's rotaRead more
Body weight varies with location on Earth’s surface due to differences in gravitational acceleration. It is not the same everywhere on Earth’s surface. At the poles (B), gravity is stronger because objects are closer to the Earth’s center. At the equator, the centrifugal force caused by Earth’s rotation counteracts some of the gravitational force, resulting in slightly lower weight. Therefore, body weight is maximum at the poles and slightly lower at the equator. Additionally, weight can vary with altitude. On hills (D), the distance from the Earth’s center is slightly greater compared to plains, resulting in slightly lower weight. However, this difference is generally negligible unless at extreme altitudes. Thus, body weight is not the same everywhere, being maximum at the poles and slightly lower at the equator.
See lessAn astronaut can jump higher on the lunar surface than on the earth’s surface, because
An astronaut can jump higher on the lunar surface than on the Earth's surface because the force of gravity on the lunar surface is much less compared to the Earth's surface (C). This weaker gravity allows the astronaut to exert less downward force on the lunar surface, enabling them to achieve greatRead more
An astronaut can jump higher on the lunar surface than on the Earth’s surface because the force of gravity on the lunar surface is much less compared to the Earth’s surface (C). This weaker gravity allows the astronaut to exert less downward force on the lunar surface, enabling them to achieve greater height in their jump. While the astronaut is not weightless on the Moon (A), there is less gravitational pull due to the Moon’s smaller mass (D), but this difference primarily accounts for the discrepancy in weight, not the ability to jump higher. The absence of atmosphere on the Moon (B) does not significantly affect the astronaut’s ability to jump higher, as it primarily influences air resistance rather than gravitational force. Thus, the correct option is (C) The force of gravity on the lunar surface is very less as compared to the Earth’s surface.
See lessThe work done to hold a weight of 20 kg at a height of 1 m above the ground is
The work done to hold a weight of 20 kg at a height of 1 m above the ground is zero Joules (D). Work is defined as the product of force and displacement in the direction of the force. When holding an object stationary, like in this scenario, there is no displacement; thus, no work is done against grRead more
The work done to hold a weight of 20 kg at a height of 1 m above the ground is zero Joules (D). Work is defined as the product of force and displacement in the direction of the force. When holding an object stationary, like in this scenario, there is no displacement; thus, no work is done against gravity. While the weight of the object is 20 kg, and the force due to gravity is approximately 9.81 m/s² (981 N/kg), the vertical displacement is zero since the object is held at a constant height. Therefore, the work done is zero. Options (A), (B), and (C) are incorrect because they imply that work is being done, but in reality, no displacement occurs when holding the weight stationary at a constant height above the ground.
See lessIf a person pushes a wall but fails to displace it, then he does
If a person pushes a wall but fails to displace it, then he does no work (A). In physics, work is defined as the product of force and displacement in the direction of the force. When there is no displacement, regardless of the magnitude of the force applied, the work done is zero. Even though the peRead more
If a person pushes a wall but fails to displace it, then he does no work (A). In physics, work is defined as the product of force and displacement in the direction of the force. When there is no displacement, regardless of the magnitude of the force applied, the work done is zero. Even though the person exerts force against the wall, if the wall does not move, there is no change in the wall’s position, and hence no work is accomplished. Option (B) is incorrect because negative work implies that energy is being taken away from the system, which doesn’t apply here. Option (C) implies some positive work, but there’s no work done if there’s no displacement. Option (D) is incorrect because maximum work would imply achieving the greatest possible displacement, which isn’t the case if the wall remains stationary. Therefore, the correct option is (A) No work.
See lessA person climbing a hill leans forward because
A person climbing a hill leans forward to increase stability (D). Leaning forward shifts the center of mass towards the hillside, enhancing balance and reducing the risk of falling backward. This posture allows the individual to maintain a more stable foothold, minimizing the chance of slipping. AddRead more
A person climbing a hill leans forward to increase stability (D). Leaning forward shifts the center of mass towards the hillside, enhancing balance and reducing the risk of falling backward. This posture allows the individual to maintain a more stable foothold, minimizing the chance of slipping. Additionally, leaning forward enables better utilization of leg muscles, providing more power for propulsion uphill. It also reduces the strain on the back by distributing the load more evenly across the body. While leaning forward may contribute to a perception of increased speed, its primary purpose is to enhance stability and safety during the ascent. Therefore, the correct option is (D) to increase stability, as it aligns with the biomechanical advantages and safety considerations associated with leaning forward while climbing a hill.
See less