Structure of Atoms: Chemistry MCQ practice questions with solutions for MBBS Admission Tests, Engineering Entrance Exams, IITJEE, NEET, NAT, IIST (ISAT) and other competitive examinations

Chemistry >> Atomic Structure

Chemistry MCQ and practice questions on selected important topics from the chapter “Atomic Structure” or “Structure of Atoms” intended for Medical and Engineering aspirants like IITJEE, NEET, MBBS Admission Tests, NAT (National Aptitude Test), ISAT (IIST Admission Test) and other competitive examinations.

Chemistry MCQ Practice Questions on Atomic Structure / Structure of Atoms :(Syllabus)

Sub-atomic Particles; Discovery of Fundamental Particles; Cathode Rays; Positive Rays; Rutherford Model; Moseley Experiment - Atomic Number; Isotopes and Isobars; Concept of Shells and Sub-shells; Electromagnetic Radiations; Emission Spectra; Hydrogen Spectrum; Atomic Models; Bohr’s Model of Atom; Sommerfeld’s Extension of Bohr Theory; Dual Nature of Matter and Light; Heisenberg Uncertainty Principle; Wave Mechanical Model of Atom; Concept of Orbital; Quantum Mechanical Model of Atom; Shapes of s, p and d Orbitals; Pauli’s Exclusion Principle; Aufbau Principlr; Hund’s Rule of Maximum Multiplicity (Orbital Diagrams); Electronic Configuration of Elements; Photoelectric Effect; Nuclear Stability; The Whole Number Rule and Packing Fraction; The Magic Numbers.        

Chemistry Objective Questions Answers: Atomic Structure or Structure of Atom

MCQ Test Series (Multiple Choice Questions) – Set 1 (Q. No. 1-10)

(Click on the link at the end to download answers in Pdf)

Question 1: Cathode rays are:

a. Electromagnetic waves

b. Stream of α – particles

c. Stream of electrons

d. Radiations

Question 2: According to Bohr’s model, if the kinetic energy of an electron in 2^nd orbit of He⁺ is x, then what should be the ionisation energy of the electron revolving in 3^rd orbit of M⁵⁺ ion

a. x

b. 4x

c. x/4

d. 2x

Question 3: When α-rays strike a thin gold foil then

a. Most of the α-rays do not pass through the gold foil

b. Most of the α-rays get reflected back

c. Most of the α-rays get deflected through small angles

d. Most of the α-rays pass through without any deviation

Question 4: Atomic number is equal to the

a. Number of neutrons in the nucleus

b. Number of protons in the nucleus

c. Sum of protons and neutrons

d. Atomic mass of the element

Question 5: Charge on a positron is equal to that of:

a. Proton

b. Electron

c. Nucleon

d. Neutron

Question 6: An atom differs from its ion in

a. Nuclear charge

b. Mass number

c. Number of electrons

d. Number of neutrons

Question 7: The correct sequence of frequency of the electromagnetic radiations in electromagnetic spectrum is –

a. X-rays > UV rays > Microwaves > Radio waves

b. Radio waves > Microwaves > UV rays > X-rays

c. UV rays > X-rays > Radio waves > Microwaves

d. Radio waves > Microwaves > X-rays > UV rays

Question 8: Rutherford’s scattering experiment is related to the size of the:

a. Nucleus

b. Atom

c. Electron

d. Neutron

Question 9: The number of nodal planes in a p_x orbital is:

a. One

b. Two

c. Three

d. Four

Question 10: Which of the following statements is false:

a. The energy of red photon is more than the energy of violet photon

b. The momentum of photon is inversely proportional to its wave length

c. The energy of a photon is inversely proportional to its wave length

d. The particle nature of electromagnetic radiations is able to explain the photoelectric effect

View/ Download Answers [pdf]

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