16/12/2019 Work, Energy and Power (STUDY BY TOPICS JUNIOR CLASS) 0Comments by Gate Academy Welcome to your Work, Energy and Power (STUDY BY TOPICS JUNIOR CLASS) NAME EMAIL PHONE NUMBER 1. [ Junior school science (physics) ]The formula of potential energy is mghfscostmgscos t2. [ Junior school science (physics) ]If you push on a wall with a force of 30 N, then _____The wall cannot be forced.The wall moves back 3 cm.The wall pushes on you with a force of 30 N.You are pulled towards the wall.3. [ Junior school science (physics) ]The following are natural sources of energy exceptFoodWindPetroleumSun4. [ Junior school science (physics) ]A drawing that uses symbols to show how the parts of an electric circuit are connected is a/an ______________Circuit diagramNichrome wireParallel circuitElectric diagram5. [ Junior school science (physics) ] An object that has potential energy has this energy because of its _____. Speed.Acceleration.Momentum.Location6. [ Junior school science (physics) ]The following are examples of contact force exceptTensionFrictionPushGravity7. [ Junior school science (physics) ]An object with mass "m" kilograms is suspended "h" meters above the ground by a string. If the string is cut, what will the velocity of the object be at the instant it hits the ground?H-2gmOne-half the mass squaredTwo times ghm squaredThe square root of 2gh8. [ Junior school science (physics) ]Which of the following is not a unit for power?HorsepowerJoule – secondWattNewton-meter per second9. [ Junior school science (physics) ]Two identical arrows, one with twice the speed of the other, are fired into a hay bale. The faster arrow will penetrate _____.Twice as far as the slower arrow.The same distance as the slower arrow.More than four times as far as the slower arrow.Four times as far as the slower arrow.10. [ Junior school science (physics) ]The SI unit of forceFaradAmpereMetreNewton11. [ Junior school science (physics) ]An object is raised above the ground gaining a certain amount of potential energy. If the same object is raised twice as high it gains _____.Half as much potential energyFour times as much potential energy.Neither of these.Twice as much potential energy.12. [ Junior school science (physics) ]Which of the following is NOT a consequence of "The Law of Conservation of Energy"?It is not necessary to use Kinematics to discover the velocity of an object accelerated by gravity if you know it's initial Potential Energy and its mass.The energy in a closed system is always constantThe Kinetic Energy of a dropped object at the instant it hits the ground is roughly equal to the potential energy of the object at the instant it was droppedPotential Energy can never be greater than Kinetic Energy13. [ Junior school science (physics) ]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.14. [ Junior school science (physics) ]The SI unit of time issecondsminutesdayshours15. [ Junior school science (physics) ]A person jumps to the ground from a platform 10 feet high. Which of the following is true?The person has less potential energy at the top of the platform than in the air.The person has more kinetic energy before they jump than after they jump.The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land.The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land.16. [ Junior school science (physics) ]An object that has kinetic energy must be ____Moving.At rest.Falling.At an elevated position.17. [ Junior school science (physics) ] Which of the following are NOT types of energy WoodSoundLightElectricity18. [ Junior school science (physics) ]An engine raised 10kg of water through a height of 60m in 20 secs ,what is the power of the engine (take g=10m/s²)30W3000W300W3W19. [ Junior school science (physics) ]Strictly speaking, a car will burn more gasoline if the car radio is turned on. This statement is ____True only if the car's engine is running.True only if the car's engine is stopped.Totally false.Always true.20. [ Junior school science (physics) ]A material through which electric current CANNOT pass easily is a/an ____________TesterReceptorConductorInsulator21 out of 20Time is Up!
