CBSE Class 11 (Science) Work and Power — practice questions
54 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 Power 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 val