28/03/2020 Energy, Work and Power(Senior Class Physics Study by Topics) 0Comments by Gate Academy Welcome to your Energy, Work and Power(Senior Class Physics Study by Topics) NAME EMAIL PHONE NUMBER 1. As an object goes up a hill at constant velocity, which of the following is NOT true?The object's Kinetic Energy is constant.The object's Kinetic Energy is decreasing.The object's Potential Energy is increasing.The object's speed is constant.2. A truck drives slams on the brakes of a moving truck with a constant velocity v, as a result of his action the truck stops after traveling a distance d. If thedriver had been traveling with twice the velocity, what would be the stopping distance compared to the distance in the first trial?Four times greaterOne-quarter as muchTwo times greaterHalf as much3. For a body moving in a circular path, the work done by the centripetal force is ________ZeroPositiveConstantNegative4. A bullet fired from a gun can pierce a target due to its ___________AccelerationKinetic energyMechanical energyHeat energy5. What happens to the total energy of a moving object if all the applied forces are conserved?It decreasesIt increasesThe velocity is required to answer this questionIt remains constant6. A person is holding a bucket by applying a force of 10N. He moves a horizontal distance of 5m and then climbs up a vertical distance of 10m. Find the total work done by him?100J150J200J50J7. A ball is projected into the air with 100 J of kinetic energy which is transformed to gravitational potential energy at the top of its trajectory. When it returns to its original level after encountering air resistance, its kinetic energy is _____.Not enough information given.More than 100 J.Less than 100 J.100 J.8. If you have to push a car forward, what are the forces acting on you? No forces act on you.The car pushes back on you, gravity pulls you down, the ground pushes up on you, and friction on your shoes pushes forward on you.Your own muscles push you down.Only gravity.9. The momentum of a bullet of mass 20 g fired from a gun is 10 kg.m/s. The kinetic energy of this bullet in kJ will be:2.550.252510. Which of the following is an example of inelastic collision?Collision between two railway compartmentsCollision between glass ballsA bullet fired into a wooden blockCollision between two vehicles11. When a body is lifted, the work done by the gravitational force is positive.FalseTrue12. Collision between two carom coins is an example for ____Oblique collisionInelastic collisionElastic collisionPerfectly inelastic collision13. A feather and a coin dropped in a vacuum fall with equal _____. AccelerationsForcesMomentaKinetic energies14. Which of the following is not a unit for power?Newton-meter per secondWattHorsepowerJoule – second15. If you push on a wall with a force of 30 N, then ______________. The wall moves back 3 cm.You are pulled towards the wall.The wall pushes on you with a force of 30 N.The wall cannot be forced.16. How much mass is converted into energy per day in Tarapur nuclear power plant operated at 107 kW?9g9.6g2g10g17. A car travels with a constant speed of 15 m/s. The car’s engine produces a 4000 N pushing force in order to keep the speed constant. How much power isdeveloped by the engine?60 W6000 W60000 W600 W18. If a mass is at rest, what must be applied to cause it to move? KilogramsForceSpeedVectors19. A person jumps to the ground from a platform 10 feet high. Which of the following is true? The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land.The person has less potential energy at the top of the platform than in the air.The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land.The person has more kinetic energy before they jump than after they jump.20. A motorbike engine can develop a power of 90000 W in order to keep a constant velocity of 30 m/s. What is the pushing force?30 N30000 N3000 N300 N21. A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process, the kinetic energy of the car. Becomes four times to that of the initialBecomes 16 times to that of the initialRemains the sameBecomes twice to that of the initial22. When a gas filled in a cylinder fitted with a movable piston is allowed to expand, the work done by the gas is positive.FalseTrue23. When a body falls freely under gravity, then the work done by the gravity is ________InfinityZeroPositiveNegative24. When a massive body collides against a light body at rest ____The velocity of the bodies get exchangedThe light body reboundsThe massive body comes to restThe light body starts moving25. A machine does 2500 J of work in 1 min. What is the power developed by the machine?150 W42 W2500 W21 W26 out of 25Time is Up!
