16/12/2019Work, 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) ]Car A has a mass of 1000 kg and a speed of 60 km/h, and car B has a mass of 2000 kg and a speed of 30 km/h. The kinetic energy of car A is _____.Equal that of car BHalf that of car BFour times that of car BTwice that of car B2. [ Junior school science (physics) ]How many Joules of energy are in one kilowatt-hour?60 kilojoules1 J3.6 megajoules60 J3. [ Junior school science (physics) ]An object that has kinetic energy must be ____At rest.Falling.Moving.At an elevated position.4. [ Junior school science (physics) ]Calculate the work done in moving a body through a distance of 20m pulled along a horizontal plane by a force of 10N applied to the plane100J200J300J400J5. [ Junior school science (physics) ]A drawing that uses symbols to show how the parts of an electric circuit are connected is a/an ______________Electric diagramNichrome wireCircuit diagramParallel circuit6. [ 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)3W30W3000W300W7. [ 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 ______.Twice as much.Four times as muchThe sameLess.8. [ Junior school science (physics) ]A material through which electric current CANNOT pass easily is a/an ____________ReceptorInsulatorTesterConductor9. [ Junior school science (physics) ]Kinetic energy is energy of a body due to itsdistancemotionlengthposition10. [ Junior school science (physics) ]If you have to push a car forward, what are the forces acting on you?Your own muscles push you down.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.No forces act on you.Only gravity.11. [ 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 _____.Four times as far as the slower arrow.More than four times as far as the slower arrow.The same distance as the slower arrow.Twice as far as the slower arrow.12. [ Junior school science (physics) ]Strictly speaking, a car will burn more gasoline if the car radio is turned on. This statement is ____Always true.True only if the car's engine is running.True only if the car's engine is stopped.Totally false.13. [ 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 _____.Twice as much potential energy.Four times as much potential energy.Neither of these.Half as much potential energy14. [ Junior school science (physics) ]Electric current in a/an ____________________ circuit travels in MORE THAN ONE path.WireConnectedParallelSeries15. [ Junior school science (physics) ]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.16. [ Junior school science (physics) ]A bullet of mass 40g is moving with a speed of 2.16km/h. Calculate its kinetic energy0.072J72J7.2J0.0072J17. [ Junior school science (physics) ]The SI unit of velocity is metre secondmetre per second squaremetre second squaremetre per second18. [ Junior school science (physics) ]When a bullet is fired from a rifle, the force on the rifle is equal to the force on the bullet. However, the energy of the bullet is greater than the energy of the recoiling rifle because the _______.Force on the bullet acts for a longer distanceThe impulse of the bullet is moreBullet's momentum is greater than that of the rifleForce on the bullet acts for a longer time19. [ Junior school science (physics) ]If you push on a wall with a force of 30 N, then _____The wall cannot be forced.The wall pushes on you with a force of 30 N.The wall moves back 3 cm.You are pulled towards the wall.20. [ Junior school science (physics) ]What is the power of a girl that has done work of 50J in 10 secs500W50W0.5W5W21 out of 20Time is Up!
