CBSE Class 11 (Science) Work and Energy — practice questions
117 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 (Science) Work and Energy in the app →Newton's first law of motion is also known as the law ofA cricket ball of mass 150 g moving at (3i+4j) m/s is hit to -(3i+4j) m/s. The magnitude of momentum change isConservation of linear momentum in a collision follows directly fromA force F acts on a 2 kg body for 3 s, changing its speed from 2 m/s to 8 m/s along the line of F. The magnituThe maximum static friction force on a body is f = μN. Static friction is best described asA 10 kg block on a frictionless surface is pulled by 20 N horizontally and 20 N at 60° above horizontal. The hImpulse equalsA body in equilibrium under several forces hasA 0.5 kg ball hits a wall at 10 m/s and rebounds at 10 m/s. The impulse on the ball isNewton's second law in vector form isA lift accelerates upward at 2 m/s². The apparent weight of a 50 kg person (g=10) isTwo blocks of 2 kg and 3 kg connected by a string are pulled by 10 N on the 3 kg block (frictionless). The accThe SI unit of force, the newton, equalsAs per your syllabus, Aristotle's fallacy held that a force is required for which condition?As per your syllabus, a ball released on a frictionless incline rises on the other side to which height?As per your syllabus, INERTIA of a body is best described as which property?As per your syllabus, Newton's FIRST law states which of the following?As per your syllabus, the QUANTITATIVE measure of inertia of a body is which physical quantity?As per your syllabus, the momentum p of a body of mass m moving with velocity v is which?As per your syllabus, momentum p is a vector with direction along which vector?As per your syllabus, why is a SHORTER stopping time more painful when catching a cricket ball?As per your syllabus, when a stationary bus suddenly starts, passengers are jerked backward primarily because As per your syllabus, a body moving on it must do which?As per your syllabus, the SI unit of momentum is which?As per your syllabus, Newton's SECOND law in SI units states which relation?As per your syllabus, the SI unit of force is the newton, with one newton equal to which value?As per your syllabus, the IMPULSE J of a force F acting for time Δt equals which quantity?As per your syllabus, an IMPULSIVE FORCE is best described by which feature?As per your syllabus, a 0.15 kg cricket ball at 12 m/s is hit back at 12 m/s along the same line. The impulse As per your syllabus, the dimensions of FORCE are which set?As per your syllabus, the second law F = m a is valid in which kind of reference frame?As per your syllabus, for a body of constant mass, the second law reduces to which form?As per your syllabus, the impulse-momentum theorem states that the impulse on a body equals which quantity?As per your syllabus, the dimensions of IMPULSE are the same as those of which quantity?As per your syllabus, the SI unit of IMPULSE is which?As per your syllabus, the total momentum of an ISOLATED system (no external force) is which?As per your syllabus, conservation of momentum applies in which kind of collisions between two bodies?As per your syllabus, in a recoil scenario (a bullet of mass m fired at v from a rifle of mass M, initially atAs per your syllabus, when a billiard ball strikes the wall normally at speed u and reflects at speed u, the iAs per your syllabus, when you push a wall, the wall pushes back with which force?As per your syllabus, the necessary condition for a particle to be in EQUILIBRIUM is which?As per your syllabus, the SI unit of force from Newton's second law is which?As per your syllabus, which statement about the labels is true?As per your syllabus, the maximum STATIC friction force on a block on a horizontal surface obeys which inequalAs per your syllabus, KINETIC (sliding) friction is approximately given by which relation?As per your syllabus, the coefficients of static and kinetic friction satisfy which order?As per your syllabus, the MAXIMUM acceleration of a train such that a box on its floor (μ_s = 0.15) remains stAs per your syllabus, if a mass just starts to slide at angle θ = 15°, the coefficient of static friction is wAs per your syllabus, among rolling, sliding (kinetic), and static friction, which is typically LOWEST?As per your syllabus, eqn 4.16, the CENTRIPETAL force needed for a body of mass m moving at speed v in a circlAs per your syllabus, eqn 4.18, the maximum speed of a car on a LEVEL circular road of radius R is which?As per your syllabus, eqn 4.22, the OPTIMUM speed (no friction needed) on a banked road of angle θ is which?As per your syllabus, a cyclist taking a R=3 m turn at 18 km/h (μ_s = 0.1) is in which condition?As per your syllabus, a R=300 m banked-at-15° racetrack with μ = 0.2 has optimum speed approximately which valAs per your syllabus, A · B equals which expression?As per your syllabus, the dot product of two PERPENDICULAR vectors is which value?As per your syllabus, î · î (dot product of a unit vector with itself) equals which value?As per your syllabus, the WORK done by a constant force F on an object undergoing displacement d is which?As per your syllabus, work done by a force perpendicular to the displacement (e.g. centripetal force in UCM) iAs per your syllabus, + Points 2, work done by FRICTION (or viscous force) on a moving body is which?As per your syllabus, the KINETIC energy of a body of mass m moving with speed v is which?As per your syllabus, the WORK-ENERGY theorem states that net work done equals which quantity?As per your syllabus, the kinetic energy is which kind of quantity?As per your syllabus, a bullet of mass 50 g at 200 m/s emerges from plywood with 10% of initial KE. The emergeAs per your syllabus, the dimensions of kinetic energy (and of work) are which?As per your syllabus, the scalar product is which property algebraically?As per your syllabus, the work done by a VARIABLE force F(x) over displacement from x_i to x_f is which?As per your syllabus, the GRAVITATIONAL potential energy of a mass m at height h above the ground (g constant)As per your syllabus, / 5.8, a force is CONSERVATIVE if work done over a closed path equals which value?As per your syllabus, eqn 5.9, a conservative force F(x) is related to its potential V(x) by which relation?As per your syllabus, example, a ball dropped from height h has speed at the ground equal to which value?As per your syllabus, is there an associated POTENTIAL ENERGY for FRICTION?As per your syllabus, the zero of GRAVITATIONAL potential energy is conventionally chosen at which level?As per your syllabus, the dimensions of POTENTIAL energy are the same as those of which quantity?As per your syllabus, an object dropped from height h, just before hitting the ground, has kinetic energy equaAs per your syllabus, the total mechanical energy E in a conservative system is which sum?As per your syllabus, eqn 5.16, Hooke's law for an ideal spring states the spring force F_s is which?As per your syllabus, the SI unit of the spring constant k is which?As per your syllabus, the elastic potential energy stored in a spring extended by x is which?As per your syllabus, Fig 5.8, in a spring-mass system at maximum extension (x = ±x_max), the kinetic energy oAs per your syllabus, Fig 5.8, at the equilibrium position (x = 0) of a spring-mass system, the kinetic energyAs per your syllabus, AVERAGE power is defined as which ratio?As per your syllabus, INSTANTANEOUS power is given by which expression in terms of F and v?As per your syllabus, 1 horsepower (hp) is approximately equal to which value?As per your syllabus, the unit kilowatt-hour (kWh) measures which physical quantity?As per your syllabus, a 1800 kg elevator going up at 2 m/s against 4000 N friction needs minimum motor power aAs per your syllabus, + Summary, the dimensions of POWER are which?As per your syllabus, an ELASTIC collision conserves which two quantities?As per your syllabus, in an INELASTIC collision, which quantity is conserved (and which is not)?As per your syllabus, eqn 5.22, in a COMPLETELY inelastic 1D collision (mass m₁ at v₁ hits m₂ at rest), the coAs per your syllabus, eqn 5.26 / 5.27, in an ELASTIC 1D collision of m₁ (v₁) with m₂ (at rest), the final veloAs per your syllabus, (2D elastic between EQUAL masses, one at rest), the two final velocities make which anglAs per your syllabus, two cars colliding and locking together (no rebound) is an example of which collision tyAs per your syllabus, during the collision interval itself, conservation of momentum holds at which moments?As per your syllabus, how many conservation equations does linear momentum yield in 3D?The SI unit of work and energy is the:The joule is named after the physicist:James Prescott Joule lived from 1811 until:Power is measured in which SI unit:One watt is equal to:The unit of power is named after:James Watt was one of the innovators of the:In which century did James Watt do that work?One horse-power is equal to:Power is which kind of physical quantity?A 100 watt bulb left on for 10 hours uses:100 watts running for 10 hours gives how many watt hours?Horse-power is still used to describe the output of:You most often meet the watt when buying:A force from which a potential energy can be derived is called:The unit of potential energy is the same as that of:In an inelastic collision, the final kinetic energy is:The scalar product of two vectors gives a:Which theorem links the work done with the change in kinetic energy?The dimensions of power are:Work and energy are measured in the same:In an elastic collision of two bodies, what is conserved?