ATOMIC STRUCTURE MCQs 20 min Score: 0 Attempted: 0/20 Subscribe 1. Atom consist of ----------- particles: (A) 1 (B) 4 (C) 2 (D) 3 2. The smallest particle of an element which takes part in chemical reaction is: (A) Molecule (B) Proton (C) Atom (D) Neutron 3. Fourth state of matter is: (A) Plasma (B) Solid (C) Liquid (D) Gas 4. The mass of proton is ----------- times heavier than that of electron: (A) 1826 (B) 1856 (C) 1836 (D) 1846 5. Mass number is sum of the masses of: (A) Electron and Proton (B) Electron and Neutron (C) Proton and Neutron (D) None 6. Charge on electron (in Coulomb) is: (A) 1.602×10⁻²⁷ (B) 1.602×10⁻²¹ (C) 1.602×10⁻¹⁹ (D) 1.602×10⁻²³ 7. Charge on proton (in Coulomb) is: (A) 1.602×10⁻¹⁹ (B) 1.602×10⁻²³ (C) 1.602×10⁻²⁷ (D) 1.602×10⁻²¹ 8. Mass of electron (in Kg) is: (A) 9.109×10⁻²⁷ (B) 9.109×10⁻²⁹ (C) 9.109×10⁻³³ (D) 9.109×10⁻³¹ 9. Mass of proton (in Kg) is: (A) 1.672×10⁻³³ (B) 1.672×10⁻²⁹ (C) 1.672×10⁻³¹ (D) 1.672×10⁻²⁷ 10. Electron was discovered by: (A) Goldstein (B) Max Planck (C) John Dalton (D) J.J Thomson 11. Electron revolves around: (A) Nucleus (B) Proton (C) Neutron (D) None of these 12. Proton was discovered by: (A) J.J Thomson (B) Goldstein (C) John Dalton (D) Max Planck 13. Percentage of carbon in wrought iron is: (A) 0.5% (B) 0.25% (C) 0.75% (D) 1% 14. H⁺ ion is also called: (A) Electron (B) Proton (C) Neutron (D) None of these 15. Which of the following is most penetrating particle of an atom: (A) Proton (B) Electron (C) Alpha particles (D) Neutron 16. Gold foil used in Rutherford experiment had thickness (cm) of: (A) 0.0002 (B) 0.0003 (C) 0.00004 (D) 0.00003 17. Shape of S orbital is: (A) Sphere (B) Square (C) Dumbbell (D) Elliptical 18. According to Bohr, which shell has lowest energy: (A) L (B) O (C) K (D) N 19. Atomic mass is represented as: (A) B (B) A (C) X (D) Z 20. Value of Planck’s constant is: (A) 6.625×10⁻³¹ (B) 6.625×10⁻³³ (C) 6.625×10⁻³⁴ (D) 6.625×10⁻²⁷
