28/03/2020Energy, 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. If a force acts perpendicular to the direction of motion of a body, what is the amount of work done?ZeroSinθConstantInfinity2. For a body moving in a circular path, the work done by the centripetal force is ________PositiveConstantNegativeZero3. 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?200J50J150J100J4. What happens to the total energy of a moving object if all the applied forces are conserved?The velocity is required to answer this questionIt increasesIt remains constantIt decreases5. 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 N300 N3000 N30000 N6. Which of the following is an example of inelastic collision?Collision between glass ballsA bullet fired into a wooden blockCollision between two railway compartmentsCollision between two vehicles7. When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy is ______.The sameFour times as muchTwice as much.Less.8. How many Joules of energy are in one kilowatt-hour?3.6 megajoules60 kilojoules1 J60 J9. If a mass is at rest, what must be applied to cause it to move?KilogramsForceSpeedVectors10. How much mass is converted into energy per day in Tarapur nuclear power plant operated at 107 kW?2g10g9.6g9g11. Collision between two carom coins is an example for ____Oblique collisionElastic collisionInelastic collisionPerfectly inelastic collision12. A bullet fired from a gun can pierce a target due to its ___________Mechanical energyAccelerationKinetic energyHeat energy13. The type of energy possessed by a simple pendulum, when it is at the mean position is:Sound energyKinetic + Potential energyKinetic energyPotential energy14. 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 speed is constant.The object's Potential Energy is increasing.The object's Kinetic Energy is decreasing.15. Which one of the following is not the unit of energy?Kilowatt hourJouleNewton meterKilowatt16. A feather and a coin dropped in a vacuum fall with equal _____.ForcesKinetic energiesAccelerationsMomenta17. When a body falls freely under gravity, then the work done by the gravity is ________InfinityZeroNegativePositive18. When a gas filled in a cylinder fitted with a movable piston is allowed to expand, the work done by the gas is positive.TrueFalse19. If an object has kinetic energy, then it also must have ____AccelerationImpulseSpeedForce20. A man of mass 50 kg jumps to a height of 1 m. His potential energy at the highest point is (g = 10 m/s2):500 J5 J50 J5000 J21. The potential energy of an object is equal to ________The size of the object compared to its surface area.The force of gravity working on the object.The work done on the object to put the object into its current state.The velocity of the object divided by its mass.22. When a coolie walks on a horizontal platform with a load on his head, the work done by the coolie on the load is zero.TrueFalse23. 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:52.50.252524. When a light body collides with a massive body at rest _____The massive body rebounds after the collisionNo reaction happensThe light body rebounds after the collisionThe light body Remains at rest25. When a massive body collides against a light body at rest ____The light body starts movingThe light body reboundsThe massive body comes to restThe velocity of the bodies get exchanged26 out of 25Time is Up!
