MCQ Structure of the Atom Chapter 4 Class 9 Science Advertisement MCQ’s For All Chapters – Science Class 9th 1. The discovery of the electron is credited toE.GoldsteinJ.J.ThomsonRutherfordChadwickQuestion 1 of 202. Canal rays were discovered byJ.J.ThomsonE.GoldsteinRutherfordBohrQuestion 2 of 203. The charge on a proton isNegativePositiveNeutralVariableQuestion 3 of 204. The mass of a proton is approximately how many times that of an electron?100100020004000Question 4 of 205. The mass of an electron is consideredEqual to protonDouble of neutronNegligibleEqual to neutronQuestion 5 of 206. The first model of the atom was proposed byRutherfordBohrJ.J.ThomsonChadwickQuestion 6 of 207. Thomson’s model compares the atom to aMangoOrangeWatermelonCoconutQuestion 7 of 208. In Thomson’s model, atoms are electrically neutral becauseProtons are absentElectrons are movingPositive and negative charges are equalNucleus is neutralQuestion 8 of 209. The alpha particle scattering experiment was done byBohrRutherfordGoldsteinChadwickQuestion 9 of 2010. The gold foil in Rutherford’s experiment was about how many atoms thick?10100100010000Question 10 of 2011. Alpha particles areHydrogen ionsHelium ionsNeon ionsSodium ionsQuestion 11 of 2012. In Rutherford’s experiment, most alpha particles passed straight through becauseAtoms are solidSpace inside the atom is emptyNucleus repelled themThey had low energyQuestion 12 of 2013. Very few α-particles were deflected becauseNucleus is small and denseElectrons repel themFoil was thickThey had low speedQuestion 13 of 2014. Rutherford concluded that the nucleus isLargeNegatively chargedVery small and positively chargedEmptyQuestion 14 of 2015. The radius of the nucleus is about how many times smaller than that of the atom?101001000100000Question 15 of 2016. The electrons revolve around the nucleus inStraight linesCircular pathsElliptical pathsRandom motionQuestion 16 of 2017. The major drawback of Rutherford’s model wasAtom was neutralCouldn’t explain stabilityNo nucleusNo electron motionQuestion 17 of 2018. Bohr’s model of the atom was proposed toDisprove DaltonExplain stabilityEliminate neutronsSupport RutherfordQuestion 18 of 2019. In Bohr’s model, electrons revolve inRandom orbitsDiscrete orbitsOpen pathsStraight linesQuestion 19 of 2020. According to Bohr, electrons in discrete orbitsRadiate energyDo not radiate energyStop movingSplit nucleusQuestion 20 of 20 Loading...
It was Very helpful thanku evidyarthi..🙏🏻
Good 👍👍👍
I scored 21/24 I am good 👍👍👍
Thanks for these MCQ if there is full science MCQ i will be more happy 😁😁😁
Soo good!
NCERT class 9th ?, if then coulombs will only not be there
I am from class 9 and I test my ability
There are some questions of which answer are not in my textbook please someone help me
Fantastic 😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😍😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😊😍😍😍😍😍😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😊😍😊😍😊😍😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊😍😊
I like this test . I hope that I will get good marks
Yes exactly
Superb fantastic test