MCQ Chapter 5 General Science Class 8 Maharashtra Board MCQ For All Chapters – General Science Class 8Inside the Atom 1. What is the valency of neon according to its electronic configuration?1208Question 1 of 202. Which shell is the valence shell of fluorine (atomic number 9)?KLMNQuestion 2 of 203. What is an isotope?Atoms with different atomic numbersAtoms with the same atomic number but different mass numbersAtoms with no neutronsAtoms with only electronsQuestion 3 of 204. Which isotope of uranium is used for nuclear fission in reactors?Uranium-238Uranium-235Uranium-232Uranium-233Question 4 of 205. What is the purpose of a moderator in a nuclear reactor?To absorb neutronsTo reduce the speed of neutronsTo increase fissionTo cool the reactorQuestion 5 of 206. Which element’s isotope is used to treat goiter?Cobalt-60Iodine-131Sodium-24Carbon-14Question 6 of 207. What happens when an electron jumps from an inner to an outer orbit in Bohr’s model?It emits energyIt absorbs energyIt remains neutralIt loses massQuestion 7 of 208. Why is the mass of an electron considered negligible?It has no chargeIt is 1800 times less than a hydrogen atomIt is located in the nucleusIt moves too fastQuestion 8 of 209. What is the atomic mass number of sulfur with 16 protons and 16 neutrons?1632488Question 9 of 2010. Which model first suggested that atoms have an internal structure?Dalton’sThomson’sRutherford’sBohr’sQuestion 10 of 2011. What is the conventional symbol for magnesium (atomic number 12, mass number 24)?¹²Mg₂₄²⁴Mg₁₂¹²Mg₁₂²⁴Mg₂₄Question 11 of 2012. What is the electronic configuration of carbon (atomic number 6)?2, 42, 82, 62, 2Question 12 of 2013. What is the valency of chlorine based on HCl?1278Question 13 of 2014. Which subatomic particle is not found in the nucleus?ProtonNeutronElectronNucleonQuestion 14 of 2015. What is heavy water used for in nuclear reactors?As a coolantAs a moderatorAs a fuelAs a controllerQuestion 15 of 2016. What is the mass of a proton approximately?1 u0 u1800 u0.5 uQuestion 16 of 2017. Why do atoms remain stable despite revolving electrons?Electrons have no chargeBohr’s stable orbits prevent energy lossThe nucleus repels electronsNeutrons balance the chargeQuestion 17 of 2018. What is the outermost shell of helium (atomic number 2)?LMKNQuestion 18 of 2019. Which isotope is used for dating archaeological objects?Carbon-14Iodine-131Cobalt-60Sodium-24Question 19 of 2020. What is the role of controllers in a nuclear reactor?To increase neutron speedTo absorb neutronsTo cool the reactorTo produce steamQuestion 20 of 20 Loading...
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