Explore Exams
Login Signup
Sign in Open App
UPSC Exam  >  UPSC Test  >  Science & Technology CSE  >  Test: Structure Of The Atom- 1 - UPSC MCQ

Test: Structure Of The Atom- 1 - UPSC MCQ


Test Description

10 Questions MCQ Test Science & Technology for UPSC CSE - Test: Structure Of The Atom- 1

Test: Structure Of The Atom- 1 for UPSC 2026 is part of Science & Technology for UPSC CSE preparation. The Test: Structure Of The Atom- 1 questions and answers have been prepared according to the UPSC exam syllabus.The Test: Structure Of The Atom- 1 MCQs are made for UPSC 2026 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Structure Of The Atom- 1 below.
Solutions of Test: Structure Of The Atom- 1 questions in English are available as part of our Science & Technology for UPSC CSE for UPSC & Test: Structure Of The Atom- 1 solutions in Hindi for Science & Technology for UPSC CSE course. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free. Attempt Test: Structure Of The Atom- 1 | 10 questions in 10 minutes | Mock test for UPSC preparation | Free important questions MCQ to study Science & Technology for UPSC CSE for UPSC Exam | Download free PDF with solutions
Test: Structure Of The Atom- 1 - Question 1
Save

Which scientist discovered the electron?

Detailed Solution for Test: Structure Of The Atom- 1 - Question 1

Answer: a) J.J. Thomson

Test: Structure Of The Atom- 1 - Question 2
Save

To determine which figure correctly represents a Magnesium (Mg) atom, we need to identify the one with the appropriate number of neutrons (n) and protons (p).

Detailed Solution for Test: Structure Of The Atom- 1 - Question 2
The Magnesium atom with 12 protons (p) and 12 neutrons (n) is represented by option D. This is derived from the atomic number (12 protons) and the mass number of Mg-24 (12 neutrons).
Clear all your doubts with EduRev
Test: Structure Of The Atom- 1 - Question 3
Save

When alpha-particles are sent through a thin metal foil, most of them pass through easily because _______.

Detailed Solution for Test: Structure Of The Atom- 1 - Question 3
When alpha particles are sent through a thin metal foil, most of them pass through easily because most of the atom is empty space. According to Rutherford's model of the atom, the majority of an atom consists of empty space with the nucleus occupying a very small volume. This allows alpha particles to traverse the foil without significant obstruction, as there is minimal material to interact with along their path.
Test: Structure Of The Atom- 1 - Question 4
Save

According to Bohr’s model, which of the following is true about electron orbits?

Detailed Solution for Test: Structure Of The Atom- 1 - Question 4

Neils Bohr proposed that electrons revolve around the nucleus only in specific allowed orbits called discrete orbits or energy levels.

Test: Structure Of The Atom- 1 - Question 5
Save

Which of the following subatomic particles have no charge?

Detailed Solution for Test: Structure Of The Atom- 1 - Question 5

The subatomic particle with no charge is the neutron. Neutrons are one of the components of an atom's nucleus.

Neutrons have no electric charge.
They are found in the nucleus alongside protons, which have a positive charge.
Electrons, which orbit the nucleus, have a negative charge.
Test: Structure Of The Atom- 1 - Question 6
Save
Rutherford’s α-particle scattering experiment demonstrated which of the following? (i) Electrons have negative charge. (ii) The mass and positive charge of an atom are concentrated in a small nucleus. (iii) Neutrons exist in the nucleus. (iv) Most of the space in an atom is empty. Which of the above statements are correct?
Detailed Solution for Test: Structure Of The Atom- 1 - Question 6
Statements (ii) and (iv) are correct. Rutherford's experiment showed that atoms have a small, dense nucleus containing most of the atom's mass and positive charge. Additionally, it revealed that most of the atom is empty space since alpha particles mostly passed through the foil unhindered. - Statement (i) was established by J.J. Thomson during his cathode ray experiments. - Statement (iii), the existence of neutrons, was discovered later by James Chadwick and was not part of Rutherford's findings.
Test: Structure Of The Atom- 1 - Question 7
Save

The atomic number of an element is equal to:

Detailed Solution for Test: Structure Of The Atom- 1 - Question 7

The atomic number of an element is defined by: The number of protons in its nucleus. This number is crucial because: It determines the element's identity. It is equal to the number of electrons in a neutral atom.

Test: Structure Of The Atom- 1 - Question 8
Save

Isotopes are atoms of the same element which have:

Detailed Solution for Test: Structure Of The Atom- 1 - Question 8

- Isotopes Definition: Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.
- Atomic Number: This is the number of protons in an atom's nucleus, which defines the element.
- Mass Number: This is the total number of protons and neutrons in an atom's nucleus.
- Choice B describes isotopes accurately: they have different mass numbers due to varying neutrons, while their atomic number (protons) remains the same.

Test: Structure Of The Atom- 1 - Question 9
Save

Isobars are atoms that have:

Detailed Solution for Test: Structure Of The Atom- 1 - Question 9

Isobars are defined by their mass numbers and atomic numbers.

Mass Numbers: Isobars have the same mass number.
Atomic Numbers: They possess different atomic numbers.

This means isobars are atoms with the same total number of protons and neutrons combined but differ in their number of protons (atomic number).

Test: Structure Of The Atom- 1 - Question 10
Save

Which law states that "In a chemical substance, the elements are always present in definite proportions by mass"?

Detailed Solution for Test: Structure Of The Atom- 1 - Question 10

The Law of Definite Proportions is a fundamental principle in chemistry.

It states that in a chemical substance, the elements are always combined in the same proportions by mass.
This means the ratio of the masses of the elements in a compound is constant, no matter the source or amount of the compound.
97 videos|501 docs|209 tests
Join Course
Information about Test: Structure Of The Atom- 1 Page
In this test you can find the Exam questions for Test: Structure Of The Atom- 1 solved & explained in the simplest way possible. Besides giving Questions and answers for Test: Structure Of The Atom- 1, EduRev gives you an ample number of Online tests for practice
Download as PDF

Important Questions for Structure Of The Atom- 1

Find all the important questions for Structure Of The Atom- 1 at EduRev.Get fully prepared for Structure Of The Atom- 1 with EduRev's comprehensive question bank and test resources. Our platform offers a diverse range of question papers covering various topics within the Structure Of The Atom- 1 syllabus. Whether you need to review specific subjects or assess your overall readiness, EduRev has you covered. The questions are designed to challenge you and help you gain confidence in tackling the actual exam. Maximize your chances of success by utilizing EduRev's extensive collection of Structure Of The Atom- 1 resources.

Structure Of The Atom- 1 MCQs with Answers

Prepare for the Structure Of The Atom- 1 within the UPSC exam with comprehensive MCQs and answers at EduRev. Our platform offers a wide range of practice papers, question papers, and mock tests to familiarize you with the exam pattern and syllabus. Access the best books, study materials, and notes curated by toppers to enhance your preparation. Stay updated with the exam date and receive expert preparation tips and paper analysis. Visit EduRev's official website today and access a wealth of videos and coaching resources to excel in your exam.

Online Tests for Structure Of The Atom- 1 Science & Technology for UPSC CSE

Practice with a wide array of question papers that follow the exam pattern and syllabus. Our platform offers a user-friendly interface, allowing you to track your progress and identify areas for improvement. Access detailed solutions and explanations for each test to enhance your understanding of concepts. With EduRev's Online Tests, you can build confidence, boost your performance, and ace Structure Of The Atom- 1 with ease. Join thousands of successful students who have benefited from our trusted online resources.
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup