CBSE Class 11 Work, Energy and Power — practice questions
52 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 11 Work, Energy and Power in the app →Per NCERT §5.1.1 (scalar product), A · B equals which expression?Per NCERT §5.1.1, the dot product of two PERPENDICULAR vectors is which value?Per NCERT §5.1.1, î · î (dot product of a unit vector with itself) equals which value?Per NCERT §5.3, the WORK done by a constant force F on an object undergoing displacement d is which?Per NCERT §5.3, work done by a force perpendicular to the displacement (e.g. centripetal force in UCM) is whicPer NCERT §5.3 + Points 2, work done by FRICTION (or viscous force) on a moving body is which?Per NCERT §5.4, the KINETIC energy of a body of mass m moving with speed v is which?Per NCERT §5.2, the WORK-ENERGY theorem states that net work done equals which quantity?Per NCERT §5.4, the kinetic energy is which kind of quantity?Per NCERT Example 5.4, a bullet of mass 50 g at 200 m/s emerges from plywood with 10% of initial KE. The emergPer NCERT §5.4, the dimensions of kinetic energy (and of work) are which?Per NCERT §5.1.1 (Summary 7), the scalar product is which property algebraically?Per NCERT §5.5, the work done by a VARIABLE force F(x) over displacement from x_i to x_f is which?Per NCERT §5.7, the GRAVITATIONAL potential energy of a mass m at height h above the ground (g constant) is whPer NCERT §5.7 / 5.8, a force is CONSERVATIVE if work done over a closed path equals which value?Per NCERT §5.8 eqn 5.9, a conservative force F(x) is related to its potential V(x) by which relation?Per NCERT §5.8, the principle of CONSERVATION OF MECHANICAL ENERGY holds when which condition is satisfied?Per NCERT §5.8 example, a ball dropped from height h has speed at the ground equal to which value?Per NCERT §5.8 (smooth inclined plane), an object released from rest at height h on a frictionless incline reaPer NCERT §5.8 (Points 8), is there an associated POTENTIAL ENERGY for FRICTION?Per NCERT §5.7 (Points 7), the zero of GRAVITATIONAL potential energy is conventionally chosen at which level?Per NCERT §5.7, the dimensions of POTENTIAL energy are the same as those of which quantity?Per NCERT §5.8, an object dropped from height h, just before hitting the ground, has kinetic energy equal to wPer NCERT §5.8 (conservation form), the total mechanical energy E in a conservative system is which sum?Per NCERT §5.9 eqn 5.16, Hooke's law for an ideal spring states the spring force F_s is which?Per NCERT §5.9, the SI unit of the spring constant k is which?Per NCERT §5.9 (Summary 6), the elastic potential energy stored in a spring extended by x is which?Per NCERT §5.9 Fig 5.8, in a spring-mass system at maximum extension (x = ±x_max), the kinetic energy of the bPer NCERT §5.9 Fig 5.8, at the equilibrium position (x = 0) of a spring-mass system, the kinetic energy is whiPer NCERT §5.9 example (5.8), a 1000 kg car at 18.0 km/h (= 5 m/s) hits a spring with k = 5.25×10³ N/m. MaximuPer NCERT §5.10, AVERAGE power is defined as which ratio?Per NCERT §5.10, INSTANTANEOUS power is given by which expression in terms of F and v?Per NCERT §5.10, 1 horsepower (hp) is approximately equal to which value?Per NCERT §5.10, the unit kilowatt-hour (kWh) measures which physical quantity?Per NCERT Example 5.10, a 1800 kg elevator going up at 2 m/s against 4000 N friction needs minimum motor powerPer NCERT §5.10 + Summary, the dimensions of POWER are which?Per NCERT §5.11.1, an ELASTIC collision conserves which two quantities?Per NCERT §5.11.1, in an INELASTIC collision, which quantity is conserved (and which is not)?Per NCERT §5.11.2 eqn 5.22, in a COMPLETELY inelastic 1D collision (mass m₁ at v₁ hits m₂ at rest), the commonPer NCERT §5.11.2, the KINETIC energy LOST in a completely inelastic 1D collision (m₁ at v₁ hitting m₂ at restPer NCERT §5.11.2 eqn 5.26 / 5.27, in an ELASTIC 1D collision of m₁ (v₁) with m₂ (at rest), the final velocityPer NCERT §5.11.2 Case I, in an elastic 1D collision between EQUAL masses (one at rest), the result is which?Per NCERT §5.11.2 Case II, in an elastic 1D collision where a LIGHT mass hits a much HEAVIER stationary mass (Per NCERT Example 5.11, in an elastic collision between a neutron and DEUTERIUM (m₂ = 2 m₁), the fraction of nPer NCERT Example 5.12 (2D elastic between EQUAL masses, one at rest), the two final velocities make which angPer NCERT §5.11.1, two cars colliding and locking together (no rebound) is an example of which collision type?Per NCERT §5.11 (Points 9), during the collision interval itself, conservation of momentum holds at which momePer NCERT §5.11.3 (2D collisions), how many conservation equations does linear momentum yield in 3D?A porter carries a $20$ kg bag horizontally for $50$ m at constant height. The work done by him on the bag agaA cricket ball of mass $0.15$ kg moves at $20$ m/s. Its kinetic energy is:A delivery boy raises a $10$ kg sack to a $2$ m shelf in $4$ s. The power expended (using $g = 10$ m/s$^2$) isA carrom coin elastically collides head-on with another identical coin at rest. After collision: