MCQ Science and Technology Class 9 Chapter 1 Maharashtra Board Laws of Motion 1. What is the law of conservation of momentum according to the document?Momentum changes with external forceTotal momentum before collision equals total momentum after collisionMomentum depends only on massMomentum is zero after collisionQuestion 1 of 202. Why is the recoil velocity of a gun smaller than the bullet’s velocity?Gun has less massGun has greater massBullet has zero massBullet has no velocityQuestion 2 of 203. What is the momentum of a 500 kg cannon recoiling at 0.25 m/s?125 kg m/s500 kg m/s0.25 kg m/s2000 kg m/sQuestion 3 of 204. What is the distance covered by an aeroplane taxiing with an acceleration of 3.2 m/s² for 30 s, starting from rest?720 m960 m1440 m480 mQuestion 4 of 205. What is the initial velocity of a kangaroo jumping 2.5 m vertically with a = 9.8 m/s²?9.8 m/s2.5 m/s0 m/s7 m/sQuestion 5 of 206. What is the acceleration of a motorboat starting from rest and reaching 15 m/s in 5 s?15 m/s²3 m/s²5 m/s²1.5 m/s²Question 6 of 207. What is the distance travelled by the motorboat in the previous question?15 m75 m37.5 m30 mQuestion 7 of 208. Why is it easier to catch a plastic ball than a rubber ball dropped from the same height?Plastic ball has less massRubber ball has less velocityPlastic ball has more accelerationRubber ball is softerQuestion 8 of 209. What happens to a coin on a cardboard when the cardboard is struck quickly?Coin moves with the cardboardCoin accelerates upwardCoin remains in place due to inertiaCoin falls into the glassQuestion 9 of 2010. Why does a boat move backward when air escapes from a balloon attached to it?Newton’s first lawNewton’s second lawConservation of energyNewton’s third lawQuestion 10 of 2011. What is the velocity of a 100 g ball after colliding with a 50 g ball, per the document’s example?3 m/s1.75 m/s2.5 m/s1.5 m/sQuestion 11 of 2012. What is the average speed of an object moving 18 m, 22 m, and 14 m in three 3-second intervals?54 m/s9 m/s6 m/s18 m/sQuestion 12 of 2013. What is the force applied on a 16 kg object with an acceleration of 3 m/s²?16 N48 N24 N3 NQuestion 13 of 2014. What is the acceleration when the same 48 N force is applied to a 24 kg object?2 m/s²3 m/s²24 m/s²48 m/s²Question 14 of 2015. What is the velocity of a 900 g plank with a 10 g bullet embedded, moving at 1.5 m/s initially?0.15 m/s1.5 m/s0.9 m/s10 m/sQuestion 15 of 2016. What is the average speed of a person swimming 100 m in 40 s, 80 m in 40 s, and 45 m in 20 s?2.25 m/s40 m/s100 m/s4.5 m/sQuestion 16 of 2017. Why does an electric fan continue rotating after being switched off?Due to frictionDue to inertiaDue to gravityDue to accelerationQuestion 17 of 2018. What is the CGS unit of force mentioned in the document?Newtonkg m/sDyneg cm/sQuestion 18 of 2019. What is one dyne defined as in the document?Force causing 1 m/s² acceleration in 1 kg massForce causing 1 cm/s² acceleration in 1 g massForce causing 1 m/s acceleration in 1 g massForce causing 1 cm/s² acceleration in 1 kg massQuestion 19 of 2020. Why is a thick bed of sand used for a high jumper to fall on?To increase momentumTo reduce the force of impactTo increase accelerationTo increase velocityQuestion 20 of 20 Loading...
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