1) The rate of doing work is called ——————- a) Force b) Acceleration c) Power d) Displacement 2) Which is the type of collision in which both the linear momentum and the kinetic energy of the system remain conserved? a) Inelastic Collision b) Elastic collision c) Destructive collision d) None of the above 3) Collision between marble balls is which type of collision? a) Inelastic Collision b) Elastic collision c) Destructive collision d) None of the above 4) The energy possessed by the body by virtue of its motion is known as? a) Chemical b) Thermal c) Kinetic d) Potential 5) Find the potential energy stored in a ball of mass 5 kg placed at a height of 3 m above the ground. a) 121.20 J b) 147.15 J c) 227.31 J d) 182.21 J 6) Explanation: Potential energy = mgh m = 5 kg, h = 3 m, g = 9.81 m/s-2 a) this b) explains c) the d) previous e) question f) click here 7) What is the power utilised when work of 1000 J is done in 2 seconds? a) 100W b) 200W c) 20 W d) 500W 8) Explanation: W=1000J, t=2 seconds Potential energy = mgh a) this b) explains c) the d) previous e) question f) click here 9) State true or false: According to Equivalence of Mass and Energy, it states that mass and energy are NOT interconvertible. a) true b) false 10) Which one has higher kinetic energy? Both light and heavy bodies have equal momenta. a) Heavy Body b) Light Body c) Both d) None of the Above 11) Explanation: Since, the momenta of the heavy body and light body are same, thus the velocity of light body is greater than that of heavy body. Also, kinetic energy is proportional to the square of velocity. Hence, the lighter body has greater kinetic energy. a) this b) explains c) the d) previous e) question f) click here 12) An electric heater of rating 1000 W is used for 5 hrs per day for 20 days. What is the electrical energy utilized? a) 100kWh b) 200 kWh c) 120 kWh d) 500 kWh 13) Explanation: Electrical energy = Power × Time, The power of the electric heater is 1000 W, and the time period is 20×5 = 100 hr.  a) this b) explains c) the d) previous e) question f) click here 14) A ball moves in a frictionless inclined table without slipping. The work done by the table surface on the ball is a) Negative b) zero c) positive d) none of the above

Work and Energy

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