MCQ Science and Technology Class 9 Chapter 2 Maharashtra Board Work and Energy 1. What is the scientific definition of work in physics?Any mental or physical activityForce applied on an object causing displacementEnergy stored in an objectMotion of an object without forceQuestion 1 of 202. What is the formula for work when force and displacement are in the same direction?Work = Force × DisplacementWork = Force ÷ DisplacementWork = Force + DisplacementWork = Force × TimeQuestion 2 of 203. What is the SI unit of work?NewtonJouleWattErgQuestion 3 of 204. What is the CGS unit of work?JouleNewtonErgWattQuestion 4 of 205. How is one joule related to erg?1 joule = 10^5 erg1 joule = 10^7 erg1 joule = 10^3 erg1 joule = 10^9 ergQuestion 5 of 206. When is work done by a force considered positive?When force and displacement are perpendicularWhen force and displacement are in opposite directionsWhen force and displacement are in the same directionWhen there is no displacementQuestion 6 of 207. When is work done by a force considered negative?When force and displacement are in the same directionWhen force and displacement are perpendicularWhen force and displacement are in opposite directionsWhen force is zeroQuestion 7 of 208. When is work done by a force zero?When force and displacement are in the same directionWhen force and displacement are perpendicularWhen force and displacement are in opposite directionsWhen displacement is maximumQuestion 8 of 209. In the example of a satellite in a circular orbit, why is the work done by the gravitational force zero?Because the force is zeroBecause the displacement is zeroBecause force and displacement are perpendicularBecause force and displacement are in the same directionQuestion 9 of 2010. What is the formula for work when the force is applied at an angle θ to the displacement?W = F s sinθW = F s cosθW = F s tanθW = F sQuestion 10 of 2011. What is the work done when a force of 100 N is applied at 60° to the horizontal, causing a displacement of 8 m?400 J800 J200 J600 JQuestion 11 of 2012. What is the work done to lift a 20 kg object to a height of 10 m (g = 9.8 m/s²)?1960 J-1960 J980 J3920 JQuestion 12 of 2013. What is the definition of energy in the context of physics?The ability to cause motionThe capacity of a body to perform workThe force applied on an objectThe displacement of an objectQuestion 13 of 2014. What are the two forms of mechanical energy discussed in the document?Kinetic and thermalPotential and kineticChemical and potentialSound and kineticQuestion 14 of 2015. What is kinetic energy?Energy stored due to positionEnergy due to motionEnergy due to heatEnergy due to compressionQuestion 15 of 2016. What is the formula for kinetic energy?K.E.= mghK.E.= ½ mv²K.E.= F sK.E.= mvQuestion 16 of 2017. How much kinetic energy does a 250 g stone have when its velocity is 2 m/s?0.5 J1 J2 J0.25 JQuestion 17 of 2018. If the mass of a moving body is doubled, how does its kinetic energy change?Remains the sameDoublesQuadruplesHalvesQuestion 18 of 2019. What is potential energy?Energy due to motionEnergy stored due to position or stateEnergy due to soundEnergy due to lightQuestion 19 of 2020. What is the formula for potential energy?P.E.= ½ mv²P.E.= mghP.E.= F sP.E.= mvQuestion 20 of 20 Loading...
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