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301. What is tension force?
ⓐ. The force exerted by a stretched string or rope
ⓑ. The force exerted by a compressed object
ⓒ. The force exerted by gravity
ⓓ. The force exerted by air resistance
Correct Answer: The force exerted by a stretched string or rope
Explanation: Tension force is the force exerted by a string, rope, cable, or similar object when it is pulled taut by forces acting from opposite ends.
302. What is the direction of tension force in a taut rope or string?
ⓐ. Away from the object to which it is attached
ⓑ. Towards the object to which it is attached
ⓒ. Parallel to the direction of the rope or string
ⓓ. Perpendicular to the direction of the rope or string
Correct Answer: Parallel to the direction of the rope or string
Explanation: Tension force in a taut rope or string acts along the direction of the rope or string, pulling outward from the points of attachment.
303. Which of the following is an example where tension force is involved?
ⓐ. A book resting on a table
ⓑ. A pendulum swinging back and forth
ⓒ. A car moving along a road
ⓓ. A person lifting weights
Correct Answer: A pendulum swinging back and forth
Explanation: In a pendulum, tension force acts along the string or rod supporting the pendulum bob, keeping it in motion.
304. How does tension force change in a rope carrying a load when the rope is at rest?
ⓐ. Tension force is maximum at the load
ⓑ. Tension force is maximum at the support
ⓒ. Tension force is the same throughout the rope
ⓓ. Tension force decreases along the length of the rope
Correct Answer: Tension force is the same throughout the rope
Explanation: In a rope carrying a load at rest, tension force remains constant throughout the rope when no external forces are acting on it.
305. In a system of multiple ropes supporting a load, how does tension force compare in ropes with different angles of inclination?
ⓐ. Ropes with steeper angles have greater tension force
ⓑ. Ropes with shallower angles have greater tension force
ⓒ. Tension force is independent of the angle of inclination
ⓓ. Tension force is zero in ropes with horizontal inclination
Correct Answer: Ropes with steeper angles have greater tension force
Explanation: In a system of ropes supporting a load, ropes with steeper angles of inclination relative to the horizontal have greater tension force because they carry more of the load’s weight.
306. Which physical quantity is used to measure tension force?
ⓐ. Newton (N)
ⓑ. Pascal (Pa)
ⓒ. Joule (J)
ⓓ. Coulomb (C)
Correct Answer: Newton (N)
Explanation: Tension force is measured in Newtons (N), which is the SI unit of force. It represents the amount of force exerted when a rope, string, or cable is stretched.
307. What happens to the tension force in a rope if additional mass is added to the rope’s lower end?
ⓐ. Tension force increases
ⓑ. Tension force decreases
ⓒ. Tension force remains the same
ⓓ. Tension force becomes zero
Correct Answer: Tension force increases
Explanation: Adding mass to the lower end of a rope increases the tension force throughout the rope due to the increased weight the rope must support.
308. What is the relationship between tension force and the acceleration of an object being pulled by a rope?
ⓐ. Tension force is proportional to acceleration
ⓑ. Tension force is inversely proportional to acceleration
ⓒ. Tension force is independent of acceleration
ⓓ. Tension force equals the object’s weight
Correct Answer: Tension force is proportional to acceleration
Explanation: Tension force exerted by a rope on an object is directly proportional to the object’s acceleration. Higher acceleration requires greater tension force.
309. In which situation would tension force be zero?
ⓐ. A rope hanging vertically from a ceiling
ⓑ. A rope being stretched horizontally between two points
ⓒ. A rope tied around a block being pulled upwards
ⓓ. A rope wrapped around a pulley system
Correct Answer: A rope hanging vertically from a ceiling
Explanation: In a rope hanging vertically from a ceiling with no external forces acting on it, tension force is zero because there is no tension in the rope.
310. What is the direction of tension force in a rope wrapped around a pulley system?
ⓐ. Away from the pulley
ⓑ. Towards the pulley
ⓒ. Parallel to the ground
ⓓ. Perpendicular to the ground
Correct Answer: Towards the pulley
Explanation: In a rope wrapped around a pulley system, tension force acts towards the pulley, as it is pulling the load or resisting the force applied to the other end.
311. What is spring force?
ⓐ. The force exerted by a stretched or compressed spring
ⓑ. The force exerted by gravity on a spring
ⓒ. The force exerted by air resistance on a spring
ⓓ. The force exerted by tension on a spring
Correct Answer: The force exerted by a stretched or compressed spring
Explanation: Spring force is the force exerted by a spring when it is stretched or compressed from its equilibrium position.
312. What is the direction of spring force when a spring is compressed?
ⓐ. Away from the object compressing the spring
ⓑ. Towards the object compressing the spring
ⓒ. Parallel to the direction of compression
ⓓ. Perpendicular to the direction of compression
Correct Answer: Towards the object compressing the spring
Explanation: When a spring is compressed, the spring force acts towards the object that is compressing it, trying to return the spring to its equilibrium position.
313. Which physical quantity is used to measure spring force?
ⓐ. Newton (N)
ⓑ. Pascal (Pa)
ⓒ. Joule (J)
ⓓ. Hertz (Hz)
Correct Answer: Newton (N)
Explanation: Spring force is measured in Newtons (N), which is the SI unit of force. It represents the force exerted by the spring when stretched or compressed.
314. What happens to spring force if a spring is stretched further from its equilibrium position?
ⓐ. Spring force increases
ⓑ. Spring force decreases
ⓒ. Spring force remains the same
ⓓ. Spring force becomes zero
Correct Answer: Spring force increases
Explanation: If a spring is stretched further from its equilibrium position, the spring force increases because the restoring force exerted by the spring increases.
315. What law governs the relationship between the displacement of a spring and the spring force it exerts?
ⓐ. Newton’s First Law of Motion
ⓑ. Hooke’s Law
ⓒ. Newton’s Second Law of Motion
ⓓ. Newton’s Third Law of Motion
Correct Answer: Hooke’s Law
Explanation: Hooke’s Law states that the force exerted by a spring is directly proportional to the displacement or stretch/compression of the spring from its equilibrium position, as long as the elastic limit is not exceeded.
316. At what point does spring force become zero?
ⓐ. At the equilibrium position
ⓑ. When the spring is stretched
ⓒ. When the spring is compressed
ⓓ. When the spring is at maximum extension
Correct Answer: At the equilibrium position
Explanation: At the equilibrium position, where the spring is neither stretched nor compressed, the spring force becomes zero because there is no displacement from which the spring can exert a restoring force.
317. What is the relationship between spring constant and spring force?
ⓐ. Spring constant is inversely proportional to spring force
ⓑ. Spring constant is directly proportional to spring force
ⓒ. Spring constant is independent of spring force
ⓓ. Spring constant equals spring force
Correct Answer: Spring constant is directly proportional to spring force
Explanation: The spring constant (k) is a measure of the stiffness of a spring. It is directly proportional to the spring force exerted when the spring is stretched or compressed. A higher spring constant means a greater force is exerted for the same amount of displacement.
318. In a spring-mass system, what determines the acceleration of the mass?
ⓐ. Spring force
ⓑ. Gravity
ⓒ. Friction
ⓓ. Net force
Correct Answer: Net force
Explanation: The acceleration of the mass in a spring-mass system is determined by the net force acting on it. This net force is usually the difference between the spring force and any opposing forces like friction or drag.
319. What type of motion does a spring-mass system exhibit when the spring is stretched and released?
ⓐ. Simple harmonic motion
ⓑ. Uniform circular motion
ⓒ. Linear motion
ⓓ. Non-uniform motion
Correct Answer: Simple harmonic motion
Explanation: A spring-mass system exhibits simple harmonic motion when the spring is stretched and released. This motion is characterized by a sinusoidal (wave-like) pattern, where the acceleration is directly proportional to displacement and directed towards the equilibrium position.
320. Which factor does not affect the spring constant of a spring?
ⓐ. Material of the spring
ⓑ. Number of coils in the spring
ⓒ. Length of the spring
ⓓ. Force applied to the spring
Correct Answer: Force applied to the spring
Explanation: The spring constant of a spring depends on factors such as the material of the spring (Young’s modulus), number of coils (related to length), and cross-sectional area of the coils. The force applied to the spring does not affect its spring constant directly.
321. What is an applied force?
ⓐ. A force applied to an object by another object or agent
ⓑ. A force applied by gravity
ⓒ. A force applied due to friction
ⓓ. A force applied by air resistance
Correct Answer: A force applied to an object by another object or agent
Explanation: An applied force is a force exerted on an object by another object or agent. It can cause a change in the object’s motion or deformation.
322. Which of the following is an example of an applied force?
ⓐ. Gravity pulling a ball downward
ⓑ. Frictional force slowing down a car
ⓒ. A person pushing a box across the floor
ⓓ. Magnetic force between two magnets
Correct Answer: A person pushing a box across the floor
Explanation: When a person pushes a box across the floor, they exert an applied force on the box, causing it to move.
323. What happens to the motion of an object when an applied force is greater than opposing forces like friction?
ⓐ. Object accelerates
ⓑ. Object decelerates
ⓒ. Object remains stationary
ⓓ. Object changes color
Correct Answer: Object accelerates
Explanation: When an applied force is greater than opposing forces like friction, the object accelerates in the direction of the applied force.
324. In which direction does an applied force act relative to the object it affects?
ⓐ. Away from the object
ⓑ. Towards the object
ⓒ. Parallel to the surface
ⓓ. Perpendicular to the surface
Correct Answer: Towards the object
Explanation: An applied force acts towards the object it affects, exerting pressure or causing a change in its motion or state.
325. What is the SI unit of applied force?
ⓐ. Newton (N)
ⓑ. Pascal (Pa)
ⓒ. Joule (J)
ⓓ. Kilogram (kg)
Correct Answer: Newton (N)
Explanation: Applied force, like all forces, is measured in Newtons (N) in the International System of Units (SI).
326. Which law of motion describes the effect of applied force on an object’s motion?
ⓐ. Newton’s First Law of Motion
ⓑ. Newton’s Second Law of Motion
ⓒ. Newton’s Third Law of Motion
ⓓ. Hooke’s Law
Correct Answer: Newton’s Second Law of Motion
Explanation: Newton’s Second Law of Motion states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
327. When a force is applied to an object, what happens to the object’s momentum?
ⓐ. Momentum decreases
ⓑ. Momentum increases
ⓒ. Momentum remains constant
ⓓ. Momentum becomes zero
Correct Answer: Momentum increases
Explanation: When a force is applied to an object, it changes the object’s momentum. If the force is in the direction of motion, the momentum increases; if opposite, it decreases.
328. What is the difference between applied force and normal force?
ⓐ. Applied force is due to gravity; normal force is due to acceleration
ⓑ. Applied force is exerted by friction; normal force is exerted by air resistance
ⓒ. Applied force is exerted on an object; normal force is exerted by the object’s surface
ⓓ. Applied force is measured in joules; normal force is measured in newtons
Correct Answer: Applied force is exerted on an object; normal force is exerted by the object’s surface
Explanation: Applied force is exerted externally on an object, causing a change in its motion or state. Normal force, on the other hand, is the force exerted by a surface that supports the weight of an object resting on it.
329. What happens to an object when the applied force is zero?
ⓐ. Object accelerates
ⓑ. Object decelerates
ⓒ. Object remains stationary
ⓓ. Object changes shape
Correct Answer: Object remains stationary
Explanation: If the applied force on an object is zero and there are no other forces acting on it, the object remains stationary due to inertia.
330. How does the direction of applied force affect the motion of an object?
ⓐ. Applied force in the direction of motion increases speed
ⓑ. Applied force opposite to motion decreases speed
ⓒ. Applied force perpendicular to motion changes direction
ⓓ. All of the above
Correct Answer: All of the above
Explanation: The direction of applied force directly affects the motion of an object: in the direction of motion, it increases speed; opposite to motion, it decreases speed; perpendicular to motion, it changes direction.
331. Which force is responsible for objects falling to the ground?
ⓐ. Applied force
ⓑ. Frictional force
ⓒ. Gravitational force
ⓓ. Magnetic force
Correct Answer: Gravitational force
Explanation: Gravitational force is the force of attraction between objects with mass, responsible for objects falling towards the Earth’s surface.
332. What type of force opposes the motion of an object sliding on a surface?
ⓐ. Applied force
ⓑ. Frictional force
ⓒ. Tension force
ⓓ. Spring force
Correct Answer: Frictional force
Explanation: Frictional force opposes the motion of an object sliding on a surface, acting parallel to the surface and opposite to the direction of motion.
333. Which force holds the nucleus of an atom together?
ⓐ. Electromagnetic force
ⓑ. Gravitational force
ⓒ. Nuclear force
ⓓ. Tension force
Correct Answer: Nuclear force
Explanation: Nuclear force (strong force) holds the protons and neutrons together in the nucleus of an atom, overcoming the electrostatic repulsion between positively charged protons.
334. What force enables a magnet to attract iron filings?
ⓐ. Gravitational force
ⓑ. Frictional force
ⓒ. Magnetic force
ⓓ. Applied force
Correct Answer: Magnetic force
Explanation: Magnetic force is the force exerted between magnets or between a magnet and magnetic material (like iron), causing attraction or repulsion based on polarity.
335. Which force allows a person to lift a book off a table?
ⓐ. Applied force
ⓑ. Normal force
ⓒ. Tension force
ⓓ. Spring force
Correct Answer: Applied force
Explanation: Applied force is the force exerted by a person (or any agent) to move or lift an object, overcoming other forces like gravity or friction.
336. Which force keeps a satellite in orbit around the Earth?
ⓐ. Gravitational force
ⓑ. Frictional force
ⓒ. Tension force
ⓓ. Electromagnetic force
Correct Answer: Gravitational force
Explanation: Gravitational force between the Earth and a satellite provides the centripetal force needed to keep the satellite in orbit around the Earth.
337. Which force allows a tree branch to bend and sway in the wind?
ⓐ. Tension force
ⓑ. Frictional force
ⓒ. Elastic force
ⓓ. Wind force
Correct Answer: Elastic force
Explanation: Elastic force is the restoring force exerted by an object (like a tree branch) when it is deformed or stretched, returning it to its original shape.
338. Which force is responsible for the pressure exerted by a fluid at a depth?
ⓐ. Buoyant force
ⓑ. Viscous force
ⓒ. Pressure force
ⓓ. Archimedes force
Correct Answer: Pressure force
Explanation: Pressure force is the force exerted by a fluid at any given point and direction, which increases with depth due to the weight of the fluid above.
339. Which force allows a person to hear sound waves?
ⓐ. Electrostatic force
ⓑ. Buoyant force
ⓒ. Tension force
ⓓ. Sound force
Correct Answer: Sound force
Explanation: Sound force is not a scientific term. Sound waves are propagated through a medium due to changes in pressure caused by vibrations and require a medium (such as air) to travel.
340. Which force causes the deformation of a rubber band when stretched?
ⓐ. Elastic force
ⓑ. Gravitational force
ⓒ. Magnetic force
ⓓ. Tension force
Correct Answer: Elastic force
Explanation: Elastic force is the restoring force exerted by a material (like a rubber band) when it is stretched or deformed, trying to return it to its original shape.
341. What is the direction of acceleration in circular motion?
ⓐ. Along the radius towards the center
ⓑ. Along the tangent to the circle
ⓒ. Perpendicular to the plane of motion
ⓓ. Opposite to the direction of motion
Correct Answer: Along the radius towards the center
Explanation: In circular motion, acceleration is directed towards the center of the circle, along the radius. This centripetal acceleration is responsible for changing the direction of velocity.
342. What type of force is responsible for maintaining circular motion?
ⓐ. Frictional force
ⓑ. Gravitational force
ⓒ. Centripetal force
ⓓ. Elastic force
Correct Answer: Centripetal force
Explanation: Centripetal force is the force that acts towards the center of a circular path, keeping an object in circular motion. It is not a new force but rather the net force that causes the centripetal acceleration.
343. What happens to the speed of an object in uniform circular motion?
ⓐ. Speed remains constant
ⓑ. Speed increases
ⓒ. Speed decreases
ⓓ. Speed changes direction
Correct Answer: Speed remains constant
Explanation: In uniform circular motion, the speed of the object remains constant, but its velocity changes due to the continuously changing direction.
344. Which of the following is true about the acceleration in circular motion?
ⓐ. It is tangential to the path
ⓑ. It is always directed outward
ⓒ. It changes speed
ⓓ. It is perpendicular to the velocity
Correct Answer: It is perpendicular to the velocity
Explanation: Centripetal acceleration, which causes circular motion, is always directed towards the center of the circle and is perpendicular to the velocity of the object.
345. What is the relationship between centripetal force and centripetal acceleration?
ⓐ. They are in the same direction
ⓑ. They have different directions
ⓒ. They are equal in magnitude
ⓓ. They are independent of each other
Correct Answer: They are in the same direction
Explanation: Centripetal force and centripetal acceleration are both directed towards the center of the circular path. Centripetal force provides the necessary acceleration to maintain circular motion.
346. Which physical quantity is conserved in uniform circular motion?
ⓐ. Kinetic energy
ⓑ. Potential energy
ⓒ. Angular momentum
ⓓ. Linear momentum
Correct Answer: Angular momentum
Explanation: Angular momentum, which depends on the mass, velocity, and radius of the circular path, is conserved in uniform circular motion where no external torques act.
347. What is the angular velocity of an object in circular motion?
ⓐ. Speed of the object
ⓑ. Rate of change of linear velocity
ⓒ. Rate of change of angular displacement
ⓓ. Rate of change of angular acceleration
Correct Answer: Rate of change of angular displacement
Explanation: Angular velocity is the rate of change of angular displacement with respect to time, indicating how fast an object is rotating around an axis in circular motion.
348. What is the relationship between period and frequency in circular motion?
ⓐ. Inverse
ⓑ. Direct
ⓒ. No relationship
ⓓ. Complex
Correct Answer: Inverse
Explanation: Period (T) is the time taken for one complete revolution in circular motion, while frequency (f) is the number of revolutions per unit time. They are inversely related: \( f = \frac{1}{T} \).
349. Which force balances the centrifugal force in circular motion?
ⓐ. Centripetal force
ⓑ. Frictional force
ⓒ. Gravitational force
ⓓ. Normal force
Correct Answer: Centripetal force
Explanation: Centripetal force is required to balance the centrifugal force (the apparent outward force experienced in rotating reference frames) and maintain circular motion.
350. What is the relationship between centripetal force and the radius of the circular path?
ⓐ. Inverse
ⓑ. Direct
ⓒ. No relationship
ⓓ. Complex
Correct Answer: Inverse
Explanation: Centripetal force required for circular motion is inversely proportional to the radius of the circular path: \( F_c = \frac{mv^2}{r} \), where \( r \) is the radius.
351. What happens if the centripetal force acting on an object in circular motion is reduced?
ⓐ. The object moves faster
ⓑ. The object moves slower
ⓒ. The object moves in a straight line
ⓓ. The object moves outward
Correct Answer: The object moves outward
Explanation: If the centripetal force acting on an object in circular motion is reduced, the object will move outward from the circular path due to the lack of inward force required to keep it in circular motion.
352. What is the relationship between centripetal force and the mass of an object in circular motion?
ⓐ. Directly proportional
ⓑ. Inversely proportional
ⓒ. No relationship
ⓓ. Proportional to the square root
Correct Answer: Directly proportional
Explanation: Centripetal force required to keep an object in circular motion is directly proportional to the mass of the object: \( F_c = \frac{mv^2}{r} \).
353. Which factor affects the magnitude of centripetal force required for circular motion?
ⓐ. Angular velocity
ⓑ. Radius of the circle
ⓒ. Surface area of the object
ⓓ. Temperature of the environment
Correct Answer: Radius of the circle
Explanation: The radius of the circular path affects the magnitude of centripetal force required for circular motion. A larger radius requires less force for the same speed and vice versa.
354. In which scenario is centripetal force not required for circular motion?
ⓐ. A car turning on a road
ⓑ. A satellite orbiting the Earth
ⓒ. A stone falling freely
ⓓ. A roller coaster loop
Correct Answer: A stone falling freely
Explanation: Centripetal force is not required for a stone falling freely under gravity because it moves in a straight line due to gravitational acceleration, not in circular motion.
355. What is the effect of increasing the speed of an object in circular motion on the centripetal force required?
ⓐ. Centripetal force decreases
ⓑ. Centripetal force increases
ⓒ. Centripetal force remains the same
ⓓ. No centripetal force is needed
Correct Answer: Centripetal force increases
Explanation: Increasing the speed of an object in circular motion increases the centripetal force required to maintain the circular path, as \( F_c = \frac{mv^2}{r} \).
356. Which force provides the centripetal force for a car turning on a curve?
ⓐ. Frictional force
ⓑ. Gravitational force
ⓒ. Magnetic force
ⓓ. Tension force
Correct Answer: Frictional force
Explanation: In the case of a car turning on a curve, frictional force between the tires and the road provides the necessary centripetal force to keep the car in circular motion.
357. What happens if the radius of the circular path decreases in circular motion?
ⓐ. Centripetal force decreases
ⓑ. Centripetal force increases
ⓒ. Centripetal force remains the same
ⓓ. No centripetal force is needed
Correct Answer: Centripetal force increases
Explanation: Decreasing the radius of the circular path increases the centripetal force required to maintain the same speed in circular motion, as \( F_c = \frac{mv^2}{r} \).
358. Which physical quantity determines the magnitude of centripetal force in circular motion?
ⓐ. Momentum
ⓑ. Speed
ⓒ. Acceleration
ⓓ. Angular displacement
Correct Answer: Speed
Explanation: The speed of the object in circular motion determines the magnitude of centripetal force required, as \( F_c = \frac{mv^2}{r} \).
359. What happens if the mass of an object in circular motion increases?
ⓐ. Centripetal force decreases
ⓑ. Centripetal force increases
ⓒ. Centripetal force remains the same
ⓓ. No centripetal force is needed
Correct Answer: Centripetal force increases
Explanation: Increasing the mass of an object in circular motion increases the centripetal force required to maintain the same speed in circular motion, as \( F_c = \frac{mv^2}{r} \).
360. In which scenario is centripetal force necessary for maintaining circular motion?
ⓐ. A rocket moving in a straight line
ⓑ. A cyclist riding straight on a road
ⓒ. A satellite orbiting the Earth
ⓓ. A stone dropped from a height
Correct Answer: A satellite orbiting the Earth
Explanation: Centripetal force is necessary for maintaining the circular motion of a satellite orbiting the Earth, providing the necessary acceleration towards the center of the Earth.
361. Which force is responsible for keeping an object in circular motion?
ⓐ. Centripetal force
ⓑ. Centrifugal force
ⓒ. Gravitational force
ⓓ. Magnetic force
Correct Answer: Centripetal force
Explanation: Centripetal force is the force that acts towards the center of a circular path, keeping an object in circular motion.
362. In which reference frame does centrifugal force appear to act?
ⓐ. Inertial reference frame
ⓑ. Rotating reference frame
ⓒ. Magnetic reference frame
ⓓ. Gravitational reference frame
Correct Answer: Rotating reference frame
Explanation: Centrifugal force appears to act in a rotating reference frame, where objects tend to move away from the center of rotation due to their inertia.
363. What is the direction of centripetal force?
ⓐ. Outward, away from the center
ⓑ. Tangential to the path
ⓒ. Perpendicular to the plane of motion
ⓓ. Inward, towards the center
Correct Answer: Inward, towards the center
Explanation: Centripetal force always acts inward, towards the center of the circular path, providing the necessary acceleration for circular motion.
364. Which force is considered a fictitious or pseudo-force?
ⓐ. Centripetal force
ⓑ. Centrifugal force
ⓒ. Gravitational force
ⓓ. Frictional force
Correct Answer: Centrifugal force
Explanation: Centrifugal force is considered a fictitious or pseudo-force because it appears to act outward in a rotating reference frame but does not arise from any physical interaction.
365. Which force balances centrifugal force in a rotating system?
ⓐ. Frictional force
ⓑ. Gravitational force
ⓒ. Centripetal force
ⓓ. Tension force
Correct Answer: Centripetal force
Explanation: Centripetal force balances centrifugal force in a rotating system, providing the necessary inward acceleration to keep objects in circular motion.
366. In which scenario is centrifugal force not considered a real force?
ⓐ. When driving a car around a curve
ⓑ. When spinning on a merry-go-round
ⓒ. When dropping an object from a height
ⓓ. When walking in a straight line
Correct Answer: When dropping an object from a height
Explanation: Centrifugal force is not considered a real force in an inertial (non-accelerating) reference frame. It only appears in rotating reference frames due to inertia.
367. What is the relationship between centripetal force and centrifugal force?
ⓐ. They are equal in magnitude
ⓑ. They have opposite directions
ⓒ. They are both fictitious forces
ⓓ. They do not exist in nature
Correct Answer: They have opposite directions
Explanation: Centripetal force acts inward towards the center of circular motion, while centrifugal force appears to act outward in a rotating reference frame. They have opposite directions.
368. Which force is responsible for the feeling of being pushed outward in a rotating vehicle?
ⓐ. Centripetal force
ⓑ. Centrifugal force
ⓒ. Gravitational force
ⓓ. Normal force
Correct Answer: Centrifugal force
Explanation: The sensation of being pushed outward in a rotating vehicle is due to centrifugal force, which is perceived in the rotating reference frame.
369. What is the origin of centripetal force?
ⓐ. Inertia of the rotating body
ⓑ. Gravitational attraction
ⓒ. Magnetic interaction
ⓓ. Normal reaction force
Correct Answer: Inertia of the rotating body
Explanation: Centripetal force arises due to the inertia of a rotating body, which tends to move in a straight line but is redirected towards the center of rotation.
370. Which force is used to simulate artificial gravity in rotating spacecraft?
ⓐ. Centripetal force
ⓑ. Centrifugal force
ⓒ. Electromagnetic force
ⓓ. Nuclear force
Correct Answer: Centripetal force
Explanation: In rotating spacecraft, centripetal force is used to simulate artificial gravity by creating a perceived outward force on the inner surface of the spacecraft.
371. Which of the following is an example of uniform circular motion?
ⓐ. A car accelerating on a straight road
ⓑ. A stone dropped from a height
ⓒ. A satellite orbiting the Earth
ⓓ. A pendulum swinging back and forth
Correct Answer: A satellite orbiting the Earth
Explanation: A satellite orbiting the Earth moves in uniform circular motion, maintaining a constant speed while continuously changing direction.
372. What provides the centripetal force for a car turning around a curve on a road?
ⓐ. Gravitational force
ⓑ. Frictional force
ⓒ. Magnetic force
ⓓ. Buoyant force
Correct Answer: Frictional force
Explanation: Frictional force between the tires of the car and the road provides the necessary centripetal force for the car to turn around a curve.
373. Which amusement park ride demonstrates circular motion?
ⓐ. Roller coaster drop
ⓑ. Ferris wheel
ⓒ. Bumper cars
ⓓ. Haunted house ride
Correct Answer: Ferris wheel
Explanation: A Ferris wheel demonstrates circular motion as it rotates around a central axis, providing riders with a circular path.
374. What type of motion does a swing exhibit at its highest point?
ⓐ. Linear motion
ⓑ. Circular motion
ⓒ. Oscillatory motion
ⓓ. Random motion
Correct Answer: Linear motion
Explanation: At its highest point, a swing exhibits linear motion along the vertical direction due to the pendulum-like motion it follows.
375. Which force causes a stone tied to a string to move in a circular path when swung around?
ⓐ. Tension force
ⓑ. Gravitational force
ⓒ. Magnetic force
ⓓ. Frictional force
Correct Answer: Tension force
Explanation: Tension force in the string provides the centripetal force necessary for the stone to move in a circular path when swung around.
376. What is an example of non-uniform circular motion?
ⓐ. Earth orbiting the Sun
ⓑ. Moon orbiting the Earth
ⓒ. Car moving along a straight road
ⓓ. Windmill rotating with constant speed
Correct Answer: Windmill rotating with constant speed
Explanation: A windmill rotating with constant speed exhibits non-uniform circular motion because its angular velocity changes over time.
377. Which physical quantity remains constant in uniform circular motion?
ⓐ. Speed
ⓑ. Acceleration
ⓒ. Momentum
ⓓ. Angular displacement
Correct Answer: Speed
Explanation: In uniform circular motion, the speed of the object remains constant, while its direction changes continuously.
378. What causes the water in a spinning bucket to remain inside when turned upside down?
ⓐ. Gravitational force
ⓑ. Centrifugal force
ⓒ. Buoyant force
ⓓ. Electromagnetic force
Correct Answer: Centrifugal force
Explanation: Centrifugal force pushes the water outward against the walls of the spinning bucket, keeping it from spilling out when inverted.
379. Which force allows an athlete to turn corners while running on a circular track?
ⓐ. Air resistance
ⓑ. Centripetal force
ⓒ. Normal force
ⓓ. Electrostatic force
Correct Answer: Centripetal force
Explanation: Centripetal force provided by friction between the athlete’s shoes and the track allows them to turn corners while running on a circular track.
380. What type of motion does a spinning top exhibit?
ⓐ. Linear motion
ⓑ. Circular motion
ⓒ. Oscillatory motion
ⓓ. Random motion
Correct Answer: Circular motion
Explanation: A spinning top exhibits circular motion as it rotates around its axis while maintaining a fixed point of rotation.
Here are some quizzes focusing on steps for problem-solving in mechanics:
381. What is the first step in problem-solving in mechanics?
ⓐ. Identify the unknowns and knowns
ⓑ. Draw a free-body diagram
ⓒ. Apply Newton’s laws of motion
ⓓ. Calculate the final answer
Correct Answer: Identify the unknowns and knowns
Explanation: The first step in problem-solving in mechanics involves identifying what is unknown and what information (knowns) is provided in the problem statement.
382. What is the purpose of drawing a free-body diagram in mechanics problems?
ⓐ. To visualize forces acting on the object
ⓑ. To calculate the mass of the object
ⓒ. To determine the acceleration of the object
ⓓ. To apply energy conservation principles
Correct Answer: To visualize forces acting on the object
Explanation: Drawing a free-body diagram helps visualize all the forces acting on an object, aiding in the application of Newton’s laws of motion and determining the net force.
383. Which step involves applying Newton’s second law of motion in problem-solving?
ⓐ. Step 1: Identify the unknowns and knowns
ⓑ. Step 2: Draw a free-body diagram
ⓒ. Step 3: Apply Newton’s laws of motion
ⓓ. Step 4: Calculate the final answer
Correct Answer: Step 3: Apply Newton’s laws of motion
Explanation: Applying Newton’s second law of motion (F = ma) involves using the free-body diagram and known forces to calculate the acceleration or other variables.
384. What is the final step in problem-solving in mechanics?
ⓐ. Identify the unknowns and knowns
ⓑ. Draw a free-body diagram
ⓒ. Apply Newton’s laws of motion
ⓓ. Calculate the final answer
Correct Answer: Calculate the final answer
Explanation: The final step in mechanics problem-solving is to calculate the desired quantity (such as acceleration, force, or displacement) using the principles of physics and the data gathered in previous steps.
385. Which step involves checking the units and dimensions of the final answer in mechanics problems?
ⓐ. Step 1: Identify the unknowns and knowns
ⓑ. Step 2: Draw a free-body diagram
ⓒ. Step 3: Apply Newton’s laws of motion
ⓓ. Step 4: Calculate the final answer
Correct Answer: Calculate the final answer
Explanation: Checking the units and dimensions of the final answer is crucial in the last step of mechanics problem-solving to ensure consistency and accuracy.
386. What is the role of considering equilibrium conditions in mechanics problem-solving?
ⓐ. To determine if forces are balanced or unbalanced
ⓑ. To calculate the speed of an object
ⓒ. To find the displacement of an object
ⓓ. To determine the direction of forces
Correct Answer: To determine if forces are balanced or unbalanced
Explanation: Considering equilibrium conditions helps determine whether the forces acting on an object are balanced (resulting in no acceleration) or unbalanced (resulting in acceleration).
387. Which step involves choosing an appropriate coordinate system in mechanics problem-solving?
ⓐ. Step 1: Identify the unknowns and knowns
ⓑ. Step 2: Draw a free-body diagram
ⓒ. Step 3: Apply Newton’s laws of motion
ⓓ. Step 4: Define an appropriate coordinate system
Correct Answer: Step 4: Define an appropriate coordinate system
Explanation: Defining an appropriate coordinate system helps simplify calculations and determine the direction of forces and accelerations in mechanics problems.
388. What does the term “resolution of forces” refer to in mechanics problem-solving?
ⓐ. Calculating the magnitude of forces
ⓑ. Decomposing forces into components
ⓒ. Solving forces using mathematical equations
ⓓ. Balancing forces in equilibrium
Correct Answer: Decomposing forces into components
Explanation: Resolution of forces involves breaking down forces into their horizontal and vertical components, which simplifies calculations and analysis in mechanics problems.
389. Which step involves considering the constraints or conditions given in the problem statement in mechanics problem-solving?
ⓐ. Step 1: Identify the unknowns and knowns
ⓑ. Step 2: Draw a free-body diagram
ⓒ. Step 3: Apply Newton’s laws of motion
ⓓ. Step 4: Apply the given constraints or conditions
Correct Answer: Step 4: Apply the given constraints or conditions
Explanation: Applying the given constraints or conditions ensures that all relevant information from the problem statement is considered in mechanics problem-solving.
390. What is the importance of reviewing and verifying each step in mechanics problem-solving?
ⓐ. To ensure the problem is solved correctly
ⓑ. To memorize the steps
ⓒ. To complete the problem quickly
ⓓ. To avoid drawing free-body diagrams
Correct Answer: To ensure the problem is solved correctly
Explanation: Reviewing and verifying each step in mechanics problem-solving helps ensure accuracy and correctness in the final solution.
391. A car of mass 1200 kg accelerates uniformly from rest to 25 m/s in 10 seconds. What is the magnitude of the net force acting on the car?
ⓐ. 1200 N
ⓑ. 3000 N
ⓒ. 15000 N
ⓓ. 30000 N
Correct Answer: 30000 N
Explanation: Using Newton’s second law (F = ma), where mass (m) = 1200 kg and acceleration (a) = 25 m/s², the net force (F) can be calculated as F = 1200 kg * 25 m/s² = 30000 N.
392. A crate of mass 50 kg is pushed along a rough horizontal surface with a force of 200 N. If the coefficient of kinetic friction between the crate and the surface is 0.4, what is the acceleration of the crate?
ⓐ. 0.02 m/s²
ⓑ. 0.04 m/s²
ⓒ. 0.08 m/s²
ⓓ. 0.10 m/s²
Correct Answer: 0.08 m/s²
Explanation: The net force acting on the crate is F_net = 200 N – frictional force. Frictional force = μ * N = 0.4 * 50 kg * 9.8 m/s² = 196 N. So, F_net = 200 N – 196 N = 4 N. Using Newton’s second law, F_net = ma, acceleration (a) = F_net / m = 4 N / 50 kg = 0.08 m/s².
393. A ball of mass 0.2 kg is thrown vertically upwards with an initial velocity of 20 m/s. What is the acceleration of the ball just after it is thrown?
ⓐ. -9.8 m/s²
ⓑ. 9.8 m/s²
ⓒ. 19.6 m/s²
ⓓ. 0 m/s²
Correct Answer: -9.8 m/s²
Explanation: At the moment of throw, the only force acting on the ball is gravity (downward), so acceleration (a) = -9.8 m/s².
394. An object of mass 5 kg is moving with a constant velocity of 10 m/s. What is the net force acting on the object?
ⓐ. 0 N
ⓑ. 5 N
ⓒ. 10 N
ⓓ. 50 N
Correct Answer: 0 N
Explanation: Newton’s first law states that an object in motion with constant velocity experiences zero net force.
395. A rocket of mass 1000 kg is launched upwards with an acceleration of 20 m/s². What is the force exerted by the rocket’s engines?
ⓐ. 2000 N
ⓑ. 1000 N
ⓒ. 20,000 N
ⓓ. 5000 N
Correct Answer: 20,000 N
Explanation: Using Newton’s second law, F = ma, where mass (m) = 1000 kg and acceleration (a) = 20 m/s², the force (F) exerted by the engines is F = 1000 kg * 20 m/s² = 20,000 N.
396. A block of mass 2 kg is sliding down a frictionless inclined plane with an acceleration of 5 m/s². What is the component of the gravitational force acting down the plane?
ⓐ. 5 N
ⓑ. 10 N
ⓒ. 15 N
ⓓ. 20 N
Correct Answer: 20 N
Explanation: The component of the gravitational force down the inclined plane is mg * sin(theta), where m = 2 kg, g = 9.8 m/s², and theta is the angle of inclination. Here, F_down = 2 kg * 9.8 m/s² * sin(theta) = 20 N.
397. A hockey puck of mass 0.1 kg is pushed along a frictionless surface with a force of 5 N. What is the acceleration of the puck?
ⓐ. 0.05 m/s²
ⓑ. 0.5 m/s²
ⓒ. 5 m/s²
ⓓ. 50 m/s²
Correct Answer: 50 m/s²
Explanation: Using Newton’s second law, F = ma, where mass (m) = 0.1 kg and force (F) = 5 N, the acceleration (a) of the puck is a = F / m = 5 N / 0.1 kg = 50 m/s².
398. An elevator of mass 1000 kg is accelerating upwards at 2 m/s². What is the tension in the cable supporting the elevator?
ⓐ. 6700.50 N
ⓑ. 9500 N
ⓒ. 10770 N
ⓓ. 11800 N
Correct Answer: 11800 N
Explanation: The tension in the cable is equal to the sum of the gravitational force and the force required to accelerate the elevator upwards. Tension = mg + ma = 1000 kg * 9.8 m/s² + 1000 kg * 2 m/s² = 9800 N + 2000 N = 11800 N.
399. A rocket of mass 500 kg is accelerating upwards at 10 m/s². What is the force of gravity acting on the rocket?
ⓐ. 500 N
ⓑ. 5000 N
ⓒ. 50000 N
ⓓ. 4900 N
Correct Answer: 4900 N
Explanation: The force of gravity acting on the rocket is given by F_gravity = mg = 500 kg * 9.8 m/s² = 4900 N.
400. A car of mass 1500 kg experiences a constant braking force of 5000 N. What is the deceleration of the car?
ⓐ. 3.33 m/s²
ⓑ. 5 m/s²
ⓒ. 10 m/s²
ⓓ. 15 m/s²
Correct Answer: 3.33 m/s²
Explanation: The deceleration (negative acceleration) of the car can be calculated using Newton’s second law: a = F / m = 5000 N / 1500 kg = 3.33 m/s².
You are studying Class 11 Physics MCQs – Chapter 5: Laws of Motion (Part 4). These MCQs are carefully designed to follow the NCERT/CBSE syllabus and are highly useful for board exams and competitive tests like JEE, NEET, and state-level exams. The full set of this chapter contains 490 questions with detailed explanations, divided across 5 parts. This section includes the fourth set of 100 MCQs with answers, focusing on mixed concepts, numerical applications, and advanced problem-solving practice.
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