MCQ questions for class 9 Science Chapter 4 Structure of the Atom
Question 1: Who proposed the nuclear model of the atom?
Democritus
Dalton
Thomson
Rutherford
Question 2: What is the charge of an electron?
Positive
Negative
Neutral
No charge
Question 3: The mass of an electron is approximately equal to the mass of a:
Proton
Neutron
Alpha particle
Positron
Question 4: The number of protons in the nucleus of an atom is called the:
Mass number
Atomic mass
Atomic number
Isotopic mass
Question 5: Which subatomic particle has a mass nearly equal to that of a proton?
Electron
Neutron
Alpha particle
Beta particle
Question 6: What is the charge of a neutron?
Positive
Negative
Neutral
No charge
Question 7: The maximum number of electrons that can be accommodated in the M shell is:
2
8
18
32
Question 8: Who discovered the neutron?
J.J. Thomson
Ernest Rutherford
James Chadwick
Niels Bohr
Question 9: What is the symbol for a positive ion?
A+
X-
M+
Y-
Question 10: The atomic number of an element is equal to the number of:
Protons
Neutrons
Electrons
Nucleons
Question 11: What is the chemical symbol for helium?
He
H
Hy
Hel
Question 12: The number of electrons in the outermost shell is known as the:
Atomic number
Mass number
Valency
Isotopic mass
Question 13: What is the mass number of an atom with 7 protons, 7 neutrons, and 7 electrons?
7
14
21
42
Question 14: The particles that are present in the nucleus of an atom are:
Protons and neutrons
Electrons
Protons, neutrons, and electrons
Positrons
Question 15: Which scientist proposed the Bohr model of the atom?
Democritus
Dalton
Thomson
Niels Bohr
Question 16: What is the maximum number of electrons in the second shell?
2
8
18
32
Question 17: The isotope of uranium with mass number 235 is used as fuel in:
Nuclear reactors
Chemical reactors
Atomic bombs
Medical imaging
Question 18: What is the charge of an alpha particle?
Positive
Negative
Neutral
No charge
Question 19: Which subatomic particle is responsible for the radioactivity of an atom?
Proton
Electron
Neutron
Alpha particle
Question 20: What is the unit of atomic mass?
Dalton
Gram
Kilogram
Atomic mass unit
Welcome to our platform, your one-stop for MCQ questions for Class 9 Science. This page is designed to assist you in reinforcing key scientific concepts and getting ready for your exams with our Class 9 Science MCQs.
Whether you're revisiting old topics or exploring new ones, our Science MCQs for Class 9 cover all areas of your syllabus. Practice these multiple-choice questions to test your knowledge and understanding of the subject, boosting your confidence in the process.
Remember, you can always find us Class 9 Science multiple choice questions, Online MCQ practice for Class 9 Science, or Comprehensive MCQ questions for Class 9 Science. Start your journey towards becoming a Class 9 Science whiz today