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Class 9 Science Chapter 4 Structure Of Atom Quiz 4
Are you ready to explore the fundamentals of atomic structure with our Class 9 Science Chapter 4 Structure of the Atom Quiz? This quiz is designed specifically to help you strengthen your understanding of key concepts from Chapter 4 of your NCERT syllabus, covering everything from the basics of atomic particles to isotopic notations and mass numbers.
The Quiz on Atom Structure for Class 9 is an excellent resource for revision and self-assessment, helping you evaluate your knowledge before exams. The multiple-choice questions are crafted to challenge your grasp of crucial topics like electrons, protons, neutrons, and atomic models. Not only does this Atomic Structure Quiz test your retention, but it also provides detailed explanations for each answer, helping you reinforce any weak areas.
Taking this Class 9 Chemistry Chapter 4 Quiz helps you prepare more effectively by focusing on important concepts that are commonly tested in exams. Whether you’re working on MCQs for structure of the atom or simply looking to revise with Class 9 Science Chapter 4 questions and answers, this quiz is a powerful tool in mastering the chapter’s content.
The chapter also delves into early atomic models like J.J. Thomson’s and Rutherford’s experiments, and covers atomic structure quiz questions on electron shells and isotopic notation. By practicing multiple-choice questions on the structure of the atom, students can improve their exam accuracy, reinforce their learning, and retain difficult concepts more effectively.
Quizzes on Class 9 Science Chapter 4 test your knowledge of atomic structure through practical questions, making learning interactive and helping you recall important facts like atomic mass, atomic number, and electron configuration.
Class 9 Science Structure of the Atom Quiz 4 Rules
- Time Limit:
You have 15 minutes to complete the quiz. Make sure to manage your time carefully, so you have enough time to review each question before submitting. - Multiple Choices:
Each question will offer multiple options. Select the one that seems most accurate based on your understanding of the topic. - Single Correct Answer:
Each question has only one correct answer. Choose the best option based on your knowledge from Chapter 4: Structure of the Atom. - No Negative Marking:
There is no penalty for incorrect answers. If you are unsure about a question, feel free to make an educated guess without worrying about losing points.
Class 9 Science Structure of the Atom Quiz 4 Structure
- Total Questions:
The quiz consists of 10 questions. - Topics Covered:
This quiz focuses on key concepts from Chapter 4: Structure of the Atom. Topics include:
- Discovery of electrons, protons, and neutrons.
- Rutherford’s atomic model.
- Bohr’s atomic model.
- Atomic number, mass number, and isotopes.
- Electronic configuration of atoms.
By following these rules and understanding the structure, you’ll be well-prepared to complete the quiz successfully. Good luck.
Class 9 Chemistry Chapter 4 Structure Of The Atom Quiz 4 Questions
Question 1: The specific heat of a metal is 0.16. Its approximate atomic weight would be:
a) 32
b) 16
c) 40
d) 64
Answer:
The correct answer is c) 40.
According to the relation between specific heat and atomic weight, specific heat × atomic weight = 6.4. Thus, 0.16 × atomic weight = 6.4, and atomic weight = 6.4 / 0.16 = 40.
Question 2: Assertion (A): Atomic masses of elements are expressed in ‘U’. Reason (R): a.m.u means atomic mass unit.
a) Both A and R are correct and R is the correct explanation of A
b) Both A and R are correct but R is not the correct explanation of A
c) A is correct, R is incorrect
d) A is incorrect, R is correct
Answer:
The correct answer is b)
Both A and R are correct but R is not the correct explanation of A.
Question 3: How many protons are present in an atom with an atomic number of 35?
a) 35 protons
b) 45 protons
c) 25 protons
d) 40 protons
Answer:
The correct answer is a) 35 protons.
The atomic number of an element is defined as the number of protons in the nucleus. Therefore, an atom with atomic number 35 has 35 protons, which corresponds to the element Bromine (Br).
Question 4: How do you represent the nucleus using isotopic notation?
a) Protons and neutrons
b) Protons and electrons
c) Electrons and neutrons
d) None of the above
Answer:
The correct answer is a) Protons and neutrons.
In isotope notation, the mass number represents the total number of protons and neutrons in the nucleus. For example, Hydrogen-1 (¹H) has one proton and no neutrons.
Question 5: What element has a mass number of 40 and 20 protons?
a) Calcium
b) Silicon
c) Nitrogen
d) Chlorine
Answer:
The correct answer is a) Calcium.
An element with 20 protons has an atomic number of 20, which corresponds to calcium. The mass number is the sum of protons and neutrons, so Calcium has a mass number of 40 and 20 protons.
Question 6: What is the atomic mass of calcium carbonate (CaCO₃)?
a) 100g
b) 40g
c) 120g
d) None of these
Answer:
The correct answer is a) 100g.
The atomic mass of calcium (Ca) is 40, carbon (C) is 12, and oxygen (O) is 16. Calcium carbonate contains 1 atom of calcium, 1 atom of carbon, and 3 atoms of oxygen. Thus, the total mass is: 40 + 12 + (3 × 16) = 100g.
Question 7: Molecular mass is defined as:
a) The mass of one atom compared with the mass of one molecule
b) The mass of one atom compared with the mass of one atom of hydrogen
c) The mass of one molecule of any substance compared with the mass of one atom of C-12
d) None of the above
Answer:
The correct answer is c) The mass of one molecule of any substance compared with the mass of one atom of C-12.
Molecular mass is the sum of the atomic masses of the atoms in a molecule and is compared relative to C-12, which has a mass of 12 units.
Question 8: If 1/6 (instead of 1/12) of a carbon atom’s mass is taken as the relative atomic mass unit, the mass of one mole of a substance will:
a) Remain unchanged
b) Be a function of the molecular mass of the substance
c) Decrease by half
d) Increase twice
Answer:
The correct answer is a) Remain unchanged.
If the atomic mass unit becomes twice as large, the relative molar mass will become half, keeping the overall product unchanged.
Question 9: The atomic weight of hydrogen is:
a) 1u
b) 1g
c) 2g
d) 2u
Answer:
The correct answer is a) 1u.
Atomic weight is expressed in atomic mass units (amu or unified mass units), and the atomic weight of hydrogen is 1u.
Question 10: 1 gram-atom of oxygen is:
a) 1g of oxygen
b) 16g of oxygen
c) 22.4g of oxygen
d) 8g of oxygen
Answer:
The correct answer is b) 16g of oxygen. 1 gram-atom of oxygen means its atomic weight in grams, which is 16g.
