This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part Ii > Class 12 Physics (Part Ii) Chapter 12 Atoms – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part Ii) Chapter 12 Atoms Quiz 1 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the maximum number of electrons the second shell can hold? A) 6 electrons. B) 8 electrons. C) 4 electrons. D) 2 electrons. Show Answer Correct Answer: B) 8 electrons. 2. Which state of matter takes the shape of the container that it is in? A) Gas. B) Solid. C) Liquid. D) Plasma. Show Answer Correct Answer: C) Liquid. 3. What is an atomic nucleus? A) The outer part of an atom in which electrons move. B) The outer part of an atom in which neutrons move. C) The central part of an atom, composed of protons and neutrons. D) The central part of an atom, composed of protons and electrons. Show Answer Correct Answer: C) The central part of an atom, composed of protons and neutrons. 4. How are atoms identified? A) By their protons. B) By their electrons. C) By their neutrons. D) None of the above. Show Answer Correct Answer: A) By their protons. 5. A field of science that studies atoms and molecules are called A) Chemistry. B) Physics. C) Geology. D) Astronomy. Show Answer Correct Answer: A) Chemistry. 6. In a fluorescent tube, electrons are emitted from the: A) Cathode. B) Anode. C) Phosphur coating. D) Mercury vapour. Show Answer Correct Answer: A) Cathode. 7. In a fluorescent tube, the UV photons are: A) Emitted as atomic electrons in mercury de-excite. B) Adsorbed as atomic electrons in phosphor de-excite. C) Emitted as atomic electrons in phosphor de-excite. D) Adsorbed as atomic electrons in mercury de-excite. Show Answer Correct Answer: A) Emitted as atomic electrons in mercury de-excite. 8. Extremely tiny particle that makes up matter A) Element. B) Molecule. C) Atom. D) Compound. Show Answer Correct Answer: C) Atom. 9. How much smaller or bigger are electrons than neutrons and protons A) 200x smaller. B) 300x bigger. C) 3000x bigger. D) 2000x smaller. Show Answer Correct Answer: D) 2000x smaller. 10. Which Dalton's postulate is this ..... "Atoms are indivisible particles, which cannot be created or destroyed in a chemical reaction." A) Postulate 2. B) Postulate 3. C) Postulate 1. D) None of These. Show Answer Correct Answer: A) Postulate 2. 11. At the distance of closest approach of an $\alpha$ A) Both kinetic energy and potential energy are equal. B) Entire kinetic energy is converted into potential energy. C) Entire potential energy is converted into kinetic energy. D) Both kinetic energy and potential energy are zero. Show Answer Correct Answer: B) Entire kinetic energy is converted into potential energy. 12. An analytical chemist looks at A) Focus on how the natural laws of physics apply to chemical reactions. B) The type of chemicals that are in substances. C) Creating new molecules or chemicals that are not found naturally. D) The complex chemistry that takes place inside of living things. Show Answer Correct Answer: B) The type of chemicals that are in substances. 13. In a fluorescent tube, the visible light photons are: A) Emitted as atomic electrons in mercury de-excite. B) Emitted as atomic electrons in phosphor de-excite. C) Adsorbed as atomic electrons in phosphor de-excite. D) Adsorbed as atomic electrons in mercury de-excite. Show Answer Correct Answer: B) Emitted as atomic electrons in phosphor de-excite. 14. In a fluorescent tube, the atomic electrons in mercury are: A) React with the phosphor coating. B) React with the fired electrons. C) De-excited by the fired electrons. D) Excited by the fired electrons. Show Answer Correct Answer: D) Excited by the fired electrons. 15. Why can't atoms be seen? A) They move too fast. B) They are too dense. C) They are hidden under the surface of the object. D) They are too small. Show Answer Correct Answer: D) They are too small. 16. Which of the following quantities has the same dimensions as that if Plancks constant: A) Angular momentum. B) Energy. C) Momentum. D) Torque. Show Answer Correct Answer: A) Angular momentum. 17. Neutrons are important because ..... A) They hold the nucleus together. B) They have a positive charge. C) They orbit outside of the atom. D) All of these. Show Answer Correct Answer: A) They hold the nucleus together. 18. Who stated this Law? ..... "In a chemical substance the elements are always present in definite proportions by mass" A) John Dalton. B) Democritus. C) Proust. D) Antoine L. Lavoisier. Show Answer Correct Answer: C) Proust. 19. This is the written out expression for a substance and contains each element in it and the number of atoms for that element. A) The Periodic Table of Elements. B) Chemical formula. C) Chemical symbol. D) Pure substance. Show Answer Correct Answer: B) Chemical formula. 20. A biochemist looks at A) The type of chemicals that are in substances. B) Focus on how the natural laws of physics apply to chemical reactions. C) The complex chemistry that takes place inside of living things. D) Creating new molecules and chemicals that are not found naturally. Show Answer Correct Answer: C) The complex chemistry that takes place inside of living things. 21. What did Democritus, Dalton, Thomson, Rutherford, and Bohr all have in common? A) They were all cool dudes. B) They each identified new isotopes of atoms. C) They each contributed to the development of the atomic theory. D) They each designed a new building. Show Answer Correct Answer: C) They each contributed to the development of the atomic theory. 22. In the spectrum of hydrogen, the ratio of the longest wavelength in the Lyman series to the longest wavelength in the Balmer series is: A) 9/4. B) 5/27. C) 27/5. D) 4/9. Show Answer Correct Answer: B) 5/27. 23. What subatomic particle is represented by this symbol (+): A) Neutron. B) Proton. C) Electron. D) None of the above. Show Answer Correct Answer: B) Proton. 24. What is the main difference between an atom and a molecule? A) Atoms have more energy than molecules. B) Atoms are single units, molecules are bonded atoms. C) Atoms are larger than molecules. D) Atoms are made of molecules. Show Answer Correct Answer: B) Atoms are single units, molecules are bonded atoms. 25. Which subatomic particle orbits the nucleus? A) Molecule. B) Electron. C) Neutron. D) Proton. Show Answer Correct Answer: B) Electron. 26. How many protons are there for an atom with 16 neutrons and atomic mass of 33? A) 17. B) 33. C) 16. D) 18. Show Answer Correct Answer: A) 17. 27. ..... are horizontal rows of elements that contain increasing numbers of protons and electrons. A) Groups. B) Periods. C) All the above. D) None of the above. Show Answer Correct Answer: B) Periods. 28. Vertical columns in the periodic table are ..... of elements with similar properties. A) Groups. B) Periods. C) All the above. D) None of the above. Show Answer Correct Answer: A) Groups. 29. Classification system for elements is called: A) Elements. B) Periods. C) Families. D) The Periodic Table of Elements. Show Answer Correct Answer: D) The Periodic Table of Elements. 30. What is the sum of the protons an neutrons called? (N):A = Z + N A) Atomic number. B) Symbol. C) Mass number. D) Chemical symbol. Show Answer Correct Answer: C) Mass number. 31. What is the maximum number of electrons the first shell can hold? A) 8 electrons. B) 6 electrons. C) 2 electrons. D) 4 electrons. Show Answer Correct Answer: C) 2 electrons. 32. In 1808, Dalton presented his ..... theory which was the turning point in the study of matter. A) Atomic. B) Molecular. C) Particle. D) Mass. Show Answer Correct Answer: A) Atomic. 33. Which subparticle of an atom can move around? A) Neutrons. B) Nucleus. C) Electrons. D) Protons. Show Answer Correct Answer: C) Electrons. 34. What is the smallest piece of an element? A) Atom. B) Molecule. C) Neutron. D) Proton. Show Answer Correct Answer: A) Atom. 35. What is the smallest sub atomic particle A) Neutron. B) Proton. C) Electron. D) All the same size. Show Answer Correct Answer: C) Electron. 36. A Physical chemist looks at A) The type of chemicals that are in substances. B) Focus on how the natural laws of physics apply to chemical reactions. C) The complex chemistry that takes place inside of living things. D) Creating new molecules and chemicals that are not found naturally. Show Answer Correct Answer: B) Focus on how the natural laws of physics apply to chemical reactions. 37. What did the Greeks believe were the four basic elements? A) Fire, air, water, and Earth. B) Fire, water, metal, and wood. C) Air, water, metal, and Earth. D) Fire, air, metal, and wood. Show Answer Correct Answer: A) Fire, air, water, and Earth. 38. According to classical electro magnetic theory, path of an electron orbit around the nucleus will be A) Spiral. B) Elliptical. C) Straight line. D) Circular. Show Answer Correct Answer: A) Spiral. 39. This is the smallest unit of an element. A) Atom. B) Nucleus. C) Molecule. D) Compound. Show Answer Correct Answer: A) Atom. 40. The nucleus of an atom consist of: A) Electrons. B) Protons and electrons. C) Protons and neutrons. D) Neutrons and electrons. Show Answer Correct Answer: C) Protons and neutrons. 41. Who proposed plum pudding model of an atom? A) Rutherford. B) J.J Thomson. C) Pauli. D) Neil Bohr. Show Answer Correct Answer: B) J.J Thomson. 42. ..... is what scientists think atoms are like. A) Chemistry. B) The box. C) The atomic structure. D) The atomic theory. Show Answer Correct Answer: D) The atomic theory. 43. The longest wavelength in Balmer series of hydrogen spectrum will be A) 4800 A$^{0}$. B) 1216 A$^{0}$. C) 6557 A$^{0}$. D) 5600 A$^{0}$. Show Answer Correct Answer: C) 6557 A$^{0}$. 44. Anything that has mass and volume and is found everywhere in the universe. A) Mass. B) Matter. C) Density. D) Molecule. Show Answer Correct Answer: B) Matter. 45. The half life of a radioactive nucleus is 50 days. The time interval (t2-t1) between the time t2 when 2/3 of it has decayed and the time t1 when 1/3 of it had decayed is- A) 30 DAYS. B) 50 DAYS. C) 15 DAYS. D) 60 DAYS. Show Answer Correct Answer: B) 50 DAYS. 46. According to Bohr's postulates, angular momentum of an electron in its orbit around a nucleus is equal to A) Equal to an integral multiple of $\frac{h}{2\pi}$. B) Equal to an integral multiple of $\frac{2h}{\pi}$. C) Equal to an integral multiple of $\frac{2\pi}{h}$. D) Equal to an integral multiple of h2 $\pi$. Show Answer Correct Answer: A) Equal to an integral multiple of $\frac{h}{2\pi}$. 47. The diameter of first orbit of hydrogen atom is of the order of A) 2 A$^{0}$. B) 0.5 A$^{0}$. C) 4 A$^{0}$. D) 1 A$^{0}$. Show Answer Correct Answer: D) 1 A$^{0}$. 48. What is the study of matter? A) Physics. B) Chemistry. C) Biology. D) Earth Science. Show Answer Correct Answer: B) Chemistry. 49. The number of atoms it would take to make a molecule of water. A) 3. B) 1. C) 4. D) 2. Show Answer Correct Answer: A) 3. 50. The center of an atom where its neutrons and protons are is called the ..... A) Nucleus. B) Electron cloud. C) Center. D) None of the above. Show Answer Correct Answer: A) Nucleus. 51. These are what determine the properties of every atom and make one element different from another. They have a positive charge (yes, I'm positive that it's a positive charge). A) Protons. B) Neutrons. C) Electrons. D) Nucleus. Show Answer Correct Answer: A) Protons. 52. In a fluorescent tube, the atomic electrons in the phosphor coating: A) De-excite. B) React. C) Excite. D) Glow. Show Answer Correct Answer: C) Excite. 53. The smallest piece of an element: A) Quark. B) Atom. C) Shell. D) Piece of paper. Show Answer Correct Answer: B) Atom. 54. A synthetic chemist looks at A) The type of chemicals that are in substances. B) Focus on how the natural laws of physics apply to chemical reactions. C) The complex chemistry that takes place inside of living things. D) Creating new molecules and chemicals that are not found naturally. Show Answer Correct Answer: D) Creating new molecules and chemicals that are not found naturally. 55. Any combination of two or more atoms that are chemically combined is called this. A) Element. B) Compound. C) Pure substance. D) Molecule. Show Answer Correct Answer: D) Molecule. 56. This is something that contains that substance and nothing else. A) Pure substance. B) Chemical formula. C) The Periodic Table of Elements. D) Matter. Show Answer Correct Answer: A) Pure substance. 57. How many atoms are in one mole? A) 6.02 x 10$^{22}$. B) 6.02 x 10$^{23}$. C) -6.02 10$^{23}$. D) 6, 020, 000, 000, 000. Show Answer Correct Answer: B) 6.02 x 10$^{23}$. 58. In a fluorescent tube, fired electrons interact with: A) UV photons. B) Visible light photons. C) Electrons in mercury atoms. D) Electrons in phospor atoms. Show Answer Correct Answer: C) Electrons in mercury atoms. 59. In Rutherford's $\alpha$ A) Gold nucleus is much heavier than $\alpha$. B) Gold is highly malleable and can be drawn into very thin sheet. C) None of the above reasons are correct. D) Both A and B are correct. Show Answer Correct Answer: D) Both A and B are correct. 60. What is the smallest particle of an element known as A) Atom. B) Mass. C) Chemical. D) Molecule. Show Answer Correct Answer: A) Atom. 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