MCQ Model of An Atom Chapter 4 Class 9 Science MCQ’s For All Chapters – Science Class 9th 1. Which of the following scientist discovered neutrons?J. ChadwickJ.J. ThomsonErnest RutherfordJohn DaltonYour comments:Question 1 of 242. A glass rod gets electrically charged on rubbing with silk cloth. What's the source of this charge?Presence of an electric source near the rodPresence of electric current in the rodPresence of atoms in the rodPresence of magnetic particles in the rodYour comments:Question 2 of 243. The proton has a charge equal in magnitude but opposite in sign to that of: neutrondeuteronselectron canal raysYour comments:Question 3 of 244. What is the other name for anode rays?Proton raysCation raysThomson raysCanal raysYour comments:Question 4 of 245. Which scientist discovered the anode rays?J.J. ThomsonJoseph L. Proust E. GoldsteinErnest RutherfordYour comments:Question 5 of 246. Which of the following gases do not have neutron in the nucleus of their atoms?Oxygen Nitrogen HeliumHydrogenYour comments:Question 6 of 247. Which of the following is not true for cathode rays?Cathode rays consist of negatively charged particles.Cathode rays were discovered by J.J Thomson.Nature of cathode rays depend upon the nature of the gas in discharge tube.Cathode rays are produced inside the discharge tube.Your comments:Question 7 of 248. What will be the net charge on the atom if it contains one electron and one proton?-2 +1+2 No chargeYour comments:Question 8 of 249. According to J.J Thomson, an atom is a positively charged sphere. Which sub-atomic particles is embedded in it?ElectronsCanal Rays ProtonsNeutronsYour comments:Question 9 of 2410. The following picture represents which model of an atom? Bohr's model of an AtomThomson model of an atomDalton's Theory Rutherford's model of an atomYour comments:Question 10 of 2411. The canal rays led to the discovery of which subatomic particle?Beta raysProtonsNeutronsElectronsYour comments:Question 11 of 2412. Which of the following is not a part of J. J. Thomson’s atomic model?Atoms have embedded negatively charged electrons.Atom is a gel of positive charge.Electrons help in conduction of electricityAtom is a hollow sphere.Your comments:Question 12 of 2413. Select the sub-atomic particles that are present in the nucleus of an atom. A. Electrons B. Protons C. Neutrons Only BOnly CBoth A and BBoth B and CYour comments:Question 13 of 2414. Thomson proposed the model of an atom to be similar to that of a: Solar systemSee sawChristmas puddingOrangeYour comments:Question 14 of 2415. What are the essential conditions for the production of anode rays?High voltage and low pressureHigh voltage and high pressureLow voltage and high pressureLow voltage and low pressureYour comments:Question 15 of 2416. What is the charge of a proton in coulombs? ABCDYour comments:Question 16 of 2417. The mass of an electron is approximately 1/2000 times that of:Proton Beta particleNeutronAlpha particleYour comments:Question 17 of 2418. Electron is represented as:e-2 P+e- P+2Your comments:Question 18 of 2419. The lightest positively charged particles are formed from:HydrogenGamma particleBeta particleHeliumYour comments:Question 19 of 2420. What is the charge on an electron?-2+2-1+1Your comments:Question 20 of 2421. ASSERTION-No. of electrons always equal to the proton no. of atom. REASON-atom is always made-up of proton and electron.a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.c) Assertion is true but Reason is false.d.) Assertion is false but Reason is true.Question 21 of 2422. ASSERTION-No. of electrons always equal to the proton no. of atom. REASON-Atoms are always made up of proton, electron, and neutron.a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.c) Assertion is true but Reason is false.d.) Assertion is false but Reason is true.Question 22 of 2423. ASSERION-No. of electrons always equal to the proton no. of atom. REASON-Same no. of proton and electron present in atom makes it stable.a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.c) Assertion is true but Reason is false.d.) Assertion is false but Reason is true.Question 23 of 2424. ASSERION-Electrons can easily remove off but not proton. REASON-Electrons are more delicate than proton.a) Both Assertion and Reason are correct, and reason is the correct explanation for assertion.b) Both Assertion and Reason are correct, and Reason is not the correct explanation for Assertion.c) Assertion is true but Reason is false.d.) Assertion is false but Reason is true.Question 24 of 24 Loading...
