Atom & its Structure MCQ Quiz – Part 3
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This Atom & its Structure MCQ Quiz helps aspirants revise important concepts related to the structure of atoms, subatomic particles, and atomic models, which are frequently asked in competitive exams. Regular practice of these MCQs improves conceptual understanding and helps candidates answer chemistry questions quickly and accurately.
GK Series – Chemistry – Atom & its Structure MCQ Quiz |
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| Subject | Chemistry |
| Chapter | Atom & its Structure |
| Part | 3 |
| Questions | 25 |
Who Should Attempt This Atom & its Structure MCQ Quiz?
This Atom & its Structure MCQ Quiz is useful for aspirants preparing for SSC, Railways, Defence, and other government job exams, where basic chemistry questions are commonly asked in the General Knowledge section.
Topics Covered in This Atom & its Structure MCQ Quiz
This Atom & its Structure MCQ Quiz is useful for aspirants preparing for SSC, Railways, Defence, and other government job exams, where basic chemistry questions are commonly asked in the General Knowledge section.
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Question 1 of 25
1. Question
The process in which a heavy nucleus splits into lighter nuclei is called
Correct
➤ Nuclear fission = splitting of heavy atom (U-235).
➤ Releases large amount of energy.Incorrect
➤ Nuclear fission = splitting of heavy atom (U-235).
➤ Releases large amount of energy. -
Question 2 of 25
2. Question
The process in which two light nuclei combine to form a heavier nucleus is called
Correct
➤ Fusion = combination of light nuclei.
➤ Occurs in Sun → huge energy.Incorrect
➤ Fusion = combination of light nuclei.
➤ Occurs in Sun → huge energy. -
Question 3 of 25
3. Question
Which process produces energy in the Sun?
Correct
➤ Fusion of hydrogen → helium.
➤ Source of solar energy.Incorrect
➤ Fusion of hydrogen → helium.
➤ Source of solar energy. -
Question 4 of 25
4. Question
Which isotope is mainly used in nuclear fission?
Correct
➤ U-235 undergoes chain reaction.
➤ Used in nuclear reactors.Incorrect
➤ U-235 undergoes chain reaction.
➤ Used in nuclear reactors. -
Question 5 of 25
5. Question
Which part of nuclear reactor slows down neutrons?
Correct
➤ Moderator slows fast neutrons.
➤ Materials: water, heavy water, graphite.Incorrect
➤ Moderator slows fast neutrons.
➤ Materials: water, heavy water, graphite. -
Question 6 of 25
6. Question
Which component absorbs excess neutrons?
Correct
➤ Control rods prevent explosion.
➤ Made of boron, cadmium.Incorrect
➤ Control rods prevent explosion.
➤ Made of boron, cadmium. -
Question 7 of 25
7. Question
Which component removes heat from reactor?
Correct
➤ Coolant absorbs heat.
➤ Converts water to steam.Incorrect
➤ Coolant absorbs heat.
➤ Converts water to steam. -
Question 8 of 25
8. Question
Which of the following produces more energy?
Correct
➤ Fusion produces maximum energy.
➤ Much higher than fission.Incorrect
➤ Fusion produces maximum energy.
➤ Much higher than fission. -
Question 9 of 25
9. Question
Thorium is abundant in India mainly in
Correct
➤ Monazite sands of Kerala.
Incorrect
➤ Monazite sands of Kerala.
-
Question 10 of 25
10. Question
Uranium enrichment means
Correct
➤ U-235 increased for reactor use.
➤ ~3–5% for power, ~90% for bombs.Incorrect
➤ U-235 increased for reactor use.
➤ ~3–5% for power, ~90% for bombs. -
Question 11 of 25
11. Question
Atomicity of a molecule is defined as
Correct
➤ Atomicity = total atoms in one molecule.
➤ Example: O₂ → atomicity = 2.Incorrect
➤ Atomicity = total atoms in one molecule.
➤ Example: O₂ → atomicity = 2. -
Question 12 of 25
12. Question
Which of the following is a diatomic molecule?
Correct
➤ O₂ is diatomic.
➤ Others are monoatomic noble gases.Incorrect
➤ O₂ is diatomic.
➤ Others are monoatomic noble gases. -
Question 13 of 25
13. Question
Which of the following is monoatomic?
Correct
➤ Noble gases exist as single atoms.
➤ Example: Ar, He.Incorrect
➤ Noble gases exist as single atoms.
➤ Example: Ar, He. -
Question 14 of 25
14. Question
Which of the following is tetra-atomic?
Correct
➤ Phosphorus (P₄) → atomicity = 4.
Incorrect
➤ Phosphorus (P₄) → atomicity = 4.
-
Question 15 of 25
15. Question
Isoelectronic species are those which have same
Correct
➤ Isoelectronic = same number of electrons.
➤ Example: Na⁺, Ne.Incorrect
➤ Isoelectronic = same number of electrons.
➤ Example: Na⁺, Ne. -
Question 16 of 25
16. Question
Which of the following is an isoelectronic pair?
Correct
➤ Both have 10 electrons.
Incorrect
➤ Both have 10 electrons.
-
Question 17 of 25
17. Question
Chemical symbols were first proposed by
Correct
➤ Jacob Berzelius (1813).
➤ Based on Latin names.Incorrect
➤ Jacob Berzelius (1813).
➤ Based on Latin names. -
Question 18 of 25
18. Question
The SI unit representing amount of substance is
Correct
➤ Mole = SI unit.
➤ Used to count particles.Incorrect
➤ Mole = SI unit.
➤ Used to count particles. -
Question 19 of 25
19. Question
One mole contains
Correct
➤ Avogadro number = 6.022 × 10²³.
Incorrect
➤ Avogadro number = 6.022 × 10²³.
-
Question 20 of 25
20. Question
Which of the following is polyatomic?
Correct
➤ Sulphur (S₈) → polyatomic molecule.
Incorrect
➤ Sulphur (S₈) → polyatomic molecule.
-
Question 21 of 25
21. Question
Which scientist discovered the proton?
Correct
➤ Rutherford (1920) discovered proton.
➤ From artificial nuclear reaction.Incorrect
➤ Rutherford (1920) discovered proton.
➤ From artificial nuclear reaction. -
Question 22 of 25
22. Question
Which particle was discovered using cathode ray experiment?
Correct
➤ Electron discovered by J.J. Thomson.
➤ Cathode rays = stream of electrons.Incorrect
➤ Electron discovered by J.J. Thomson.
➤ Cathode rays = stream of electrons. -
Question 23 of 25
23. Question
Canal rays consist of
Correct
➤ Goldstein discovered canal rays.
➤ Positively charged particles.Incorrect
➤ Goldstein discovered canal rays.
➤ Positively charged particles. -
Question 24 of 25
24. Question
Which statement is correct about atom?
Correct
➤ From Rutherford experiment.
➤ Most alpha particles passed straight.Incorrect
➤ From Rutherford experiment.
➤ Most alpha particles passed straight. -
Question 25 of 25
25. Question
Which of the following explains stability of atom?
Correct
➤ Bohr introduced energy levels.
➤ Explained stability of atom.Incorrect
➤ Bohr introduced energy levels.
➤ Explained stability of atom.