MCQ Science and Technology Class 9 Chapter 2 Maharashtra Board Work and Energy 1. How much potential energy is stored in 500 kg of water in a tank 10 m high (g = 9.8 m/s²)?49000 J98000 J24500 J196000 JQuestion 1 of 202. Why do Ajay and Atul get different potential energy values for the same ball on a table?Because they use different massesBecause they measure height from different reference pointsBecause they use different gravitational constantsBecause they calculate kinetic energyQuestion 2 of 203. Which form of energy is primarily used in a stretched piece of rubber?Kinetic energyPotential energySound energyHeat energyQuestion 3 of 204. What type of energy does a fast-moving car primarily have?Potential energyKinetic energyChemical energyThermal energyQuestion 4 of 205. What type of energy is produced by the whistling of a cooker due to steam?Kinetic energyPotential energySound energyChemical energyQuestion 5 of 206. What happens to the energy in exploding firecrackers?It is destroyedIt is transformed into light, sound, and heatIt remains chemical energyIt becomes potential energyQuestion 6 of 207. What does the law of conservation of energy state?Energy can be created but not destroyedEnergy can neither be created nor destroyedEnergy can be destroyed but not createdEnergy remains constant only in free fallQuestion 7 of 208. In the coupled oscillators activity, what happens when one pendulum swings?The second pendulum remains stationaryThe second pendulum starts swingingBoth pendulums stop immediatelyThe first pendulum stops instantlyQuestion 8 of 209. What is free fall?Motion under frictional forceMotion solely under gravitational forceMotion with constant velocityMotion without any forceQuestion 9 of 2010. What is the total energy of an object at the top of a free fall (height h)?K.E.= mghP.E.= 0T.E.= mghK.E.= ½ mv²Question 10 of 2011. What is the kinetic energy of an object at the ground in free fall from height h?K.E.= 0K.E.= mghK.E.= ½ mghK.E.= 2mghQuestion 11 of 2012. What is the potential energy of an object at the ground in free fall?P.E.= mghP.E.= 0P.E.= ½ mghP.E.= 2mghQuestion 12 of 2013. What is power defined as?The amount of work doneThe rate at which work is doneThe force appliedThe displacement causedQuestion 13 of 2014. What is the SI unit of power?JouleNewtonWattErgQuestion 14 of 2015. How is one horsepower related to watts?1 hp = 746 W1 hp = 1000 W1 hp = 500 W1 hp = 3600 WQuestion 15 of 2016. What is the unit of energy for commercial use?JouleWattKilowatt-hourErgQuestion 16 of 2017. How much power does Swaralee use to carry a 20 kg bag to 5 m in 40 s?24.5 W49 W12.25 W98 WQuestion 17 of 2018. How much electricity does a 25 W bulb consume in 10 hours daily?0.25 kWh0.5 kWh1 kWh2.5 kWhQuestion 18 of 2019. For work to be performed, energy must be:DestroyedTransformed from one type to anotherConcentratedCreatedQuestion 19 of 2020. Which forces have to be overcome when Minakshee displaces a wooden block?Gravitational and frictional forcesOnly gravitational forceOnly frictional forceApplied forceQuestion 20 of 20 Loading...
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