MCQ Science and Technology Class 9 Chapter 4 Maharashtra Board Measurement of Matter 1. What is the Unified Mass unit called?GramDaltonMoleKilogramQuestion 1 of 202. What is the approximate value of 1 Dalton (u)?1.66053904 × 10⁻²⁷ kg1.66053904 × 10⁻²⁴ kg1.66053904 × 10⁻²¹ kg1.66053904 × 10⁻³⁰ kgQuestion 2 of 203. Who invented the current method of choosing chemical symbols?DaltonLavoisierBerzeliusProustQuestion 3 of 204. Which element exists in a mono-atomic molecular state?OxygenNitrogenHeliumHydrogenQuestion 4 of 205. What is the molecular mass of a substance?The mass of its nucleusThe sum of the atomic masses of all atoms in a moleculeThe mass of its electronsThe mass of one atomQuestion 5 of 206. What is the molecular mass of water (H₂O)?16 u18 u20 u32 uQuestion 6 of 207. What is the atomic mass of sodium (Na)?23 u24 u39 u40 uQuestion 7 of 208. What is the molecular mass of NaCl?35.5 u58.5 u46 u23 uQuestion 8 of 209. What is a mole of a substance?The mass equal to its atomic massThe mass in grams equal to its molecular massThe number of atoms in a moleculeThe volume of a substanceQuestion 9 of 2010. What is Avogadro’s number?6.022 × 10²⁰6.022 × 10²³6.022 × 10²⁶6.022 × 10¹⁸Question 10 of 2011. How many molecules are there in 1 mole of water?6.022 × 10²³12 × 10²³18 × 10²³1 × 10²³Question 11 of 2012. How many molecules are in 66 g of CO₂?6.022 × 10²³9.033 × 10²³12.044 × 10²³3.011 × 10²³Question 12 of 2013. What is the valency of an element?The number of protons in its nucleusThe number of chemical bonds it can formThe number of electrons in its nucleusThe mass of the atomQuestion 13 of 2014. What is the valency of sodium in NaCl?1230Question 14 of 2015. What is the valency of chlorine in NaCl?1230Question 15 of 2016. What type of ions are positively charged?AnionsCationsNeutronsRadicalsQuestion 16 of 2017. What are negatively charged ions called?CationsAnionsProtonsElectronsQuestion 17 of 2018. Which element exhibits variable valency?SodiumIronChlorineHydrogenQuestion 18 of 2019. What is the chemical formula of sodium sulphate?NaSO₄Na₂SO₄NaSNa₂SQuestion 19 of 2020. What is the valency of the sulphate radical (SO₄²⁻)?1234Question 20 of 20 Loading...
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