ls -la /tmp/workspace/ 2>/dev/null || mkdir -p /tmp/workspace/structure-of-atom && echo "created"

mkdir -p /tmp/workspace/structure-of-atom && cat > /tmp/workspace/structure-of-atom/generate_mcq.py << 'PYEOF' from reportlab.lib.pagesizes import A4 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.units import cm from reportlab.lib import colors from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, HRFlowable, Table, TableStyle from reportlab.lib.enums import TA_LEFT, TA_CENTER, TA_JUSTIFY mcqs = [ # --- Atomic models & Thomson / Rutherford --- { "q": "1. In Rutherford's alpha-particle scattering experiment, the distance of closest approach for an alpha particle of kinetic energy 4 MeV towards a gold nucleus (Z = 79) is:", "opts": [ "A) 2.84 × 10⁻¹⁴ m", "B) 5.68 × 10⁻¹⁴ m", "C) 1.42 × 10⁻¹⁴ m", "D) 2.84 × 10⁻¹³ m", ], }, { "q": "2. The ratio of the number of alpha particles scattered at angles greater than 90° to those scattered at angles greater than 60° in Rutherford's experiment is approximately:", "opts": [ "A) 1 : 2", "B) 1 : 4", "C) 1 : 8", "D) 1 : 16", ], }, { "q": "3. Thomson's atomic model is also called the 'plum pudding' model. Which of the following statements about it is INCORRECT?", "opts": [ "A) The atom is a sphere of uniformly distributed positive charge.", "B) Electrons are embedded in the positive sphere.", "C) The total negative charge equals the total positive charge.", "D) The nucleus occupies a very small volume at the centre.", ], }, # --- Bohr model --- { "q": "4. The energy of the electron in the nth Bohr orbit of hydrogen is −13.6/n² eV. The wavelength of the photon emitted when an electron jumps from n = 4 to n = 2 is:", "opts": [ "A) 486 nm", "B) 656 nm", "C) 122 nm", "D) 103 nm", ], }, { "q": "5. The radius of the second Bohr orbit of hydrogen atom is:", "opts": [ "A) 0.529 Å", "B) 1.058 Å", "C) 2.116 Å", "D) 4.232 Å", ], }, { "q": "6. According to Bohr's model, the velocity of an electron in the nth orbit of hydrogen is (symbols have usual meaning):", "opts": [ "A) v = e²/(4πε₀ℏn)", "B) v = nℏ/(me²)", "C) v = 2πe²/(nh)", "D) v = nh/(2πme²)", ], }, { "q": "7. The ionisation energy of He⁺ ion (Z = 2) from the ground state is:", "opts": [ "A) 13.6 eV", "B) 27.2 eV", "C) 54.4 eV", "D) 6.8 eV", ], }, { "q": "8. In a hydrogen atom, the electron jumps from the 3rd orbit to the 1st orbit. The recoil velocity of the hydrogen atom (mass ≈ 1.67 × 10⁻²⁷ kg) is approximately:", "opts": [ "A) 1.5 m/s", "B) 4.0 m/s", "C) 7.9 m/s", "D) 3.3 m/s", ], }, { "q": "9. The angular momentum of an electron in the 3rd Bohr orbit of hydrogen atom is:", "opts": [ "A) h/2π", "B) 3h/2π", "C) 3h/π", "D) 9h/2π", ], }, { "q": "10. Which of the following series of hydrogen spectrum lies in the visible region?", "opts": [ "A) Lyman series", "B) Balmer series", "C) Paschen series", "D) Brackett series", ], }, { "q": "11. The Rydberg constant R∞ in SI units is approximately:", "opts": [ "A) 1.097 × 10⁷ m⁻¹", "B) 1.097 × 10⁹ m⁻¹", "C) 1.097 × 10⁵ m⁻¹", "D) 1.097 × 10¹¹ m⁻¹", ], }, { "q": "12. A hydrogen-like atom (atomic number Z) has its electron in the n = 4 orbit. The de Broglie wavelength of the electron is λ. If the electron drops to n = 2, the new de Broglie wavelength is:", "opts": [ "A) λ/2", "B) 2λ", "C) λ/4", "D) 4λ", ], }, # --- Quantum numbers --- { "q": "13. The maximum number of electrons that can be accommodated in all orbitals with principal quantum number n = 3 is:", "opts": [ "A) 8", "B) 18", "C) 10", "D) 32", ], }, { "q": "14. Which set of quantum numbers (n, l, mₗ, mₛ) is NOT possible?", "opts": [ "A) (2, 1, –1, +½)", "B) (3, 2, 2, –½)", "C) (4, 0, 0, +½)", "D) (2, 2, 1, +½)", ], }, { "q": "15. The orbital with quantum numbers n = 4, l = 2 is:", "opts": [ "A) 4s", "B) 4p", "C) 4d", "D) 4f", ], }, { "q": "16. The number of radial nodes in a 3p orbital is:", "opts": [ "A) 0", "B) 1", "C) 2", "D) 3", ], }, { "q": "17. For which of the following sets is the magnetic quantum number mₗ = 0 NOT possible?", "opts": [ "A) l = 0", "B) l = 1", "C) l = 2", "D) l = –1", ], }, { "q": "18. The total number of nodes (radial + angular) in a 4f orbital is:", "opts": [ "A) 3", "B) 4", "C) 5", "D) 6", ], }, # --- Electronic configuration & Aufbau / Hund / Pauli --- { "q": "19. The ground-state electronic configuration of Cr (Z = 24) is:", "opts": [ "A) [Ar] 3d⁴ 4s²", "B) [Ar] 3d⁵ 4s¹", "C) [Ar] 3d⁶ 4s⁰", "D) [Ar] 3d³ 4s²4p¹", ], }, { "q": "20. Which one of the following has the highest number of unpaired electrons?", "opts": [ "A) Fe²⁺ (Z = 26)", "B) Cr³⁺ (Z = 24)", "C) Mn²⁺ (Z = 25)", "D) V²⁺ (Z = 23)", ], }, { "q": "21. The element with electronic configuration [Xe] 4f¹⁴ 5d¹⁰ 6s² belongs to which block?", "opts": [ "A) s-block", "B) p-block", "C) d-block", "D) f-block", ], }, { "q": "22. According to Hund's rule, which of the following electronic configurations for carbon (Z = 6) is correct?", "opts": [ "A) 1s² 2s² 2p² with both 2p electrons in the same orbital with opposite spins", "B) 1s² 2s² 2p² with the 2p electrons in different orbitals with parallel spins", "C) 1s² 2s¹ 2p³ with all 2p electrons with parallel spins", "D) 1s² 2s² 2p² with the 2p electrons in different orbitals with antiparallel spins", ], }, { "q": "23. The correct order of energies of atomic orbitals in a many-electron atom is:", "opts": [ "A) 3d < 4s < 4p", "B) 4s < 3d < 4p", "C) 3d < 4p < 4s", "D) 4s < 4p < 3d", ], }, # --- De Broglie, Heisenberg, wave mechanics --- { "q": "24. An electron is accelerated through a potential difference of 100 V. Its de Broglie wavelength is approximately (mₑ = 9.11 × 10⁻³¹ kg, e = 1.6 × 10⁻¹⁹ C):", "opts": [ "A) 1.23 Å", "B) 0.123 Å", "C) 12.3 Å", "D) 0.0123 Å", ], }, { "q": "25. According to Heisenberg's uncertainty principle, the product Δx · Δpₓ is:", "opts": [ "A) ≥ h/4π", "B) ≤ h/4π", "C) = h/2π exactly", "D) ≥ h/2π", ], }, { "q": "26. The uncertainty in the position of an electron moving with a velocity of 3 × 10⁴ m/s (uncertainty in velocity = 0.01%) is approximately:", "opts": [ "A) 1.93 × 10⁻² m", "B) 1.93 × 10⁻⁴ m", "C) 3.84 × 10⁻² m", "D) 3.84 × 10⁻⁴ m", ], }, { "q": "27. The wave function ψ for an atomic orbital has a physical interpretation in terms of:", "opts": [ "A) The probability of finding the electron at a point", "B) The square of the probability of finding the electron", "C) The probability density, |ψ|², which gives the probability per unit volume", "D) The kinetic energy of the electron", ], }, { "q": "28. For a 1s orbital of hydrogen, the radial probability distribution function 4πr²|ψ|² has its maximum at:", "opts": [ "A) r = 0", "B) r = a₀ (Bohr radius)", "C) r = 2a₀", "D) r = a₀/2", ], }, # --- Photoelectric effect, photons --- { "q": "29. The threshold frequency for a metal is ν₀. When light of frequency 2ν₀ falls on the metal, the maximum kinetic energy of the emitted photoelectrons is:", "opts": [ "A) hν₀", "B) 2hν₀", "C) hν₀/2", "D) 3hν₀", ], }, { "q": "30. The stopping potential required to stop the fastest photoelectrons emitted from a sodium surface (work function = 2.3 eV) when light of wavelength 300 nm is incident is approximately:", "opts": [ "A) 0.83 V", "B) 1.83 V", "C) 2.30 V", "D) 4.13 V", ], }, # --- Hydrogen spectrum / spectral series --- { "q": "31. The shortest wavelength in the Paschen series of hydrogen spectrum corresponds to the transition:", "opts": [ "A) n = 4 → n = 3", "B) n = ∞ → n = 3", "C) n = 5 → n = 3", "D) n = 6 → n = 3", ], }, { "q": "32. The number of spectral lines that can be observed when an electron in a hydrogen atom de-excites from the 5th excited state (n = 6) to the ground state is:", "opts": [ "A) 5", "B) 10", "C") "15", "D) 6", ], }, { "q": "33. In a hydrogen-like atom, the ratio of the wavelength of the second line of Balmer series to the first line of Lyman series is:", "opts": [ "A) 27/5", "B) 20/3", "C) 5/27", "D) 3/20", ], }, # --- X-ray, Moseley's law --- { "q": "34. According to Moseley's law, the frequency of Kα X-rays is proportional to:", "opts": [ "A) Z", "B) Z²", "C) (Z – σ)²", "D) (Z – σ)^(1/2)", ], }, { "q": "35. The minimum wavelength of X-rays produced in a Coolidge tube operating at 40 kV is approximately:", "opts": [ "A) 0.031 Å", "B) 0.31 Å", "C) 3.1 Å", "D) 0.0031 Å", ], }, # --- Miscellaneous / mixed --- { "q": "36. The first ionisation energy of hydrogen is 13.6 eV. The energy required to remove the electron from n = 2 orbit of H-atom is:", "opts": [ "A) 3.4 eV", "B) 6.8 eV", "C) 1.51 eV", "D) 13.6 eV", ], }, { "q": "37. The number of orbitals possible with quantum numbers n = 4 and l = 3 is:", "opts": [ "A) 3", "B) 5", "C) 7", "D) 9", ], }, { "q": "38. The orbital angular momentum of an electron in 3d orbital is:", "opts": [ "A) √2 ℏ", "B) √6 ℏ", "C) √12 ℏ", "D) 2ℏ", ], }, { "q": "39. Consider the following statements:\n I. The nucleus of an atom contains protons and neutrons.\n II. The electron in a Bohr orbit has both kinetic energy and potential energy, and total energy is negative.\n III. The emission spectrum of hydrogen gives continuous lines.\n IV. The de Broglie wavelength of a macroscopic object (mass ~1 kg) is negligibly small.\n Which of the above statements are CORRECT?", "opts": [ "A) I, II and III", "B) I, II and IV", "C) II, III and IV", "D) I, III and IV", ], }, { "q": "40. An electron in a hydrogen atom makes a transition from n₁ to n₂. The time period of revolution is proportional to n³. If the ratio of time periods T₁ : T₂ = 8 : 1, the ratio n₁ : n₂ is:", "opts": [ "A) 2 : 1", "B) 1 : 2", "C) 4 : 1", "D) 1 : 4", ], }, ] # Fix the typo in Q32 option C for q in mcqs: fixed = [] for opt in q["opts"]: fixed.append(str(opt)) q["opts"] = fixed # ---- Build PDF ---- output_path = "/tmp/workspace/structure-of-atom/Structure_of_Atom_MCQs.pdf" doc = SimpleDocTemplate( output_path, pagesize=A4, leftMargin=2*cm, rightMargin=2*cm, topMargin=2.5*cm, bottomMargin=2.5*cm, ) styles = getSampleStyleSheet() title_style = ParagraphStyle( "Title", parent=styles["Normal"], fontSize=18, fontName="Helvetica-Bold", alignment=TA_CENTER, spaceAfter=4, textColor=colors.HexColor("#1a237e"), ) subtitle_style = ParagraphStyle( "Subtitle", parent=styles["Normal"], fontSize=11, fontName="Helvetica", alignment=TA_CENTER, spaceAfter=2, textColor=colors.HexColor("#37474f"), ) meta_style = ParagraphStyle( "Meta", parent=styles["Normal"], fontSize=10, fontName="Helvetica-Oblique", alignment=TA_CENTER, spaceAfter=14, textColor=colors.HexColor("#546e7a"), ) q_style = ParagraphStyle( "Question", parent=styles["Normal"], fontSize=11, fontName="Helvetica-Bold", spaceBefore=10, spaceAfter=4, leading=16, ) opt_style = ParagraphStyle( "Option", parent=styles["Normal"], fontSize=11, fontName="Helvetica", leftIndent=20, spaceAfter=2, leading=15, ) instr_style = ParagraphStyle( "Instr", parent=styles["Normal"], fontSize=10, fontName="Helvetica", spaceBefore=0, spaceAfter=6, leading=14, textColor=colors.HexColor("#37474f"), ) story = [] # Title block story.append(Paragraph("Structure of Atom", title_style)) story.append(Paragraph("Practice Questions – JEE Level", subtitle_style)) story.append(Paragraph("Total Questions: 40 &nbsp;&nbsp;|&nbsp;&nbsp; Time: 60 Minutes &nbsp;&nbsp;|&nbsp;&nbsp; Each question has a single correct answer", meta_style)) story.append(HRFlowable(width="100%", thickness=1.5, color=colors.HexColor("#1a237e"), spaceAfter=8)) instructions = ( "<b>Instructions:</b> &nbsp;Each question carries 4 marks. There is a negative marking of –1 for each wrong answer. " "Choose the single most appropriate option. No answer key is provided – attempt all questions independently." ) story.append(Paragraph(instructions, instr_style)) story.append(HRFlowable(width="100%", thickness=0.5, color=colors.HexColor("#90a4ae"), spaceAfter=10)) for i, item in enumerate(mcqs): story.append(Paragraph(item["q"], q_style)) for opt in item["opts"]: story.append(Paragraph(opt, opt_style)) if (i + 1) % 5 == 0 and i != len(mcqs) - 1: story.append(Spacer(1, 6)) story.append(Spacer(1, 20)) story.append(HRFlowable(width="100%", thickness=0.5, color=colors.HexColor("#90a4ae"))) story.append(Paragraph("--- End of Question Paper ---", meta_style)) doc.build(story) print("PDF created at:", output_path) PYEOF python3 /tmp/workspace/structure-of-atom/generate_mcq.py

cat > /tmp/workspace/structure-of-atom/generate_mcq.py << 'PYEOF' from reportlab.lib.pagesizes import A4 from reportlab.lib.styles import getSampleStyleSheet, ParagraphStyle from reportlab.lib.units import cm from reportlab.lib import colors from reportlab.platypus import SimpleDocTemplate, Paragraph, Spacer, HRFlowable from reportlab.lib.enums import TA_LEFT, TA_CENTER mcqs = [ { "q": "1. In Rutherford's alpha-particle scattering experiment, the distance of closest approach for an alpha particle of kinetic energy 4 MeV towards a gold nucleus (Z = 79) is:", "opts": ["A) 2.84 × 10⁻¹⁴ m", "B) 5.68 × 10⁻¹⁴ m", "C) 1.42 × 10⁻¹⁴ m", "D) 2.84 × 10⁻¹³ m"], }, { "q": "2. The ratio of the number of alpha particles scattered at angles greater than 90° to those at greater than 60° in Rutherford's experiment is approximately:", "opts": ["A) 1 : 2", "B) 1 : 4", "C) 1 : 8", "D) 1 : 16"], }, { "q": "3. Which of the following statements about Thomson's 'plum pudding' atomic model is INCORRECT?", "opts": [ "A) The atom is a sphere of uniformly distributed positive charge.", "B) Electrons are embedded in the positive sphere.", "C) The total negative charge equals the total positive charge.", "D) The nucleus occupies a very small, dense volume at the centre.", ], }, { "q": "4. The wavelength of the photon emitted when an electron in hydrogen atom jumps from n = 4 to n = 2 is approximately:", "opts": ["A) 486 nm", "B) 656 nm", "C) 122 nm", "D) 103 nm"], }, { "q": "5. The radius of the second Bohr orbit of hydrogen atom is:", "opts": ["A) 0.529 A", "B) 1.058 A", "C) 2.116 A", "D) 4.232 A"], }, { "q": "6. According to Bohr's model, the speed of the electron in the nth orbit of hydrogen is (e = electron charge, epsilon0 = permittivity of free space, h = Planck's constant):", "opts": [ "A) v = e^2 / (4*pi*epsilon0 * h*n)", "B) v = 2*pi*e^2 / (4*pi*epsilon0 * nh)", "C) v = n*h / (2*pi*m*e^2)", "D) v = nh / (m*e^2)", ], }, { "q": "7. The ionisation energy of He+ ion (Z = 2) from its ground state is:", "opts": ["A) 13.6 eV", "B) 27.2 eV", "C) 54.4 eV", "D) 6.8 eV"], }, { "q": "8. In a hydrogen atom, an electron jumps from the 3rd orbit to the 1st orbit. The recoil speed of the hydrogen atom (mass = 1.67 × 10⁻²⁷ kg) is approximately:", "opts": ["A) 1.5 m/s", "B) 4.0 m/s", "C) 7.9 m/s", "D) 3.3 m/s"], }, { "q": "9. The angular momentum of an electron in the 3rd Bohr orbit of hydrogen is:", "opts": ["A) h/2pi", "B) 3h/2pi", "C) 3h/pi", "D) 9h/2pi"], }, { "q": "10. Which of the following spectral series of hydrogen lies in the visible region?", "opts": ["A) Lyman series", "B) Balmer series", "C) Paschen series", "D) Brackett series"], }, { "q": "11. The Rydberg constant R_infinity in SI units is approximately:", "opts": [ "A) 1.097 × 10^7 m⁻¹", "B) 1.097 × 10^9 m⁻¹", "C) 1.097 × 10^5 m⁻¹", "D) 1.097 × 10^11 m⁻¹", ], }, { "q": "12. A hydrogen-like atom has its electron in the n = 4 orbit with de Broglie wavelength lambda. If the electron drops to n = 2, the new de Broglie wavelength is:", "opts": ["A) lambda/2", "B) 2*lambda", "C) lambda/4", "D) 4*lambda"], }, { "q": "13. The maximum number of electrons that can be accommodated in all orbitals with principal quantum number n = 3 is:", "opts": ["A) 8", "B) 18", "C) 10", "D) 32"], }, { "q": "14. Which set of quantum numbers (n, l, ml, ms) is NOT possible?", "opts": [ "A) (2, 1, -1, +1/2)", "B) (3, 2, 2, -1/2)", "C) (4, 0, 0, +1/2)", "D) (2, 2, 1, +1/2)", ], }, { "q": "15. The orbital with quantum numbers n = 4, l = 2 is:", "opts": ["A) 4s", "B) 4p", "C) 4d", "D) 4f"], }, { "q": "16. The number of radial nodes in a 3p orbital is:", "opts": ["A) 0", "B) 1", "C) 2", "D) 3"], }, { "q": "17. For which value of l is ml = 0 the ONLY possibility?", "opts": ["A) l = 0 only", "B) l = 1", "C) l = 2", "D) l = 3"], }, { "q": "18. The total number of nodes (radial + angular) in a 4f orbital is:", "opts": ["A) 3", "B) 4", "C) 5", "D) 6"], }, { "q": "19. The ground-state electronic configuration of Cr (Z = 24) is:", "opts": [ "A) [Ar] 3d4 4s2", "B) [Ar] 3d5 4s1", "C) [Ar] 3d6 4s0", "D) [Ar] 3d3 4s2 4p1", ], }, { "q": "20. Which of the following ions has the highest number of unpaired electrons?", "opts": [ "A) Fe2+ (Z = 26)", "B) Cr3+ (Z = 24)", "C) Mn2+ (Z = 25)", "D) V2+ (Z = 23)", ], }, { "q": "21. The element with electronic configuration [Xe] 4f14 5d10 6s2 belongs to which block?", "opts": ["A) s-block", "B) p-block", "C) d-block", "D) f-block"], }, { "q": "22. According to Hund's rule, which electronic configuration for carbon (Z = 6) is correct?", "opts": [ "A) 1s2 2s2 2p2: both 2p electrons in same orbital with opposite spins", "B) 1s2 2s2 2p2: the two 2p electrons in different orbitals with parallel spins", "C) 1s2 2s1 2p3: all 2p electrons with parallel spins", "D) 1s2 2s2 2p2: the two 2p electrons in different orbitals with antiparallel spins", ], }, { "q": "23. The correct order of energies of atomic orbitals in a many-electron atom is:", "opts": ["A) 3d < 4s < 4p", "B) 4s < 3d < 4p", "C) 3d < 4p < 4s", "D) 4s < 4p < 3d"], }, { "q": "24. An electron is accelerated through 100 V. Its de Broglie wavelength is approximately (me = 9.11 × 10⁻³¹ kg):", "opts": ["A) 1.23 Angstrom", "B) 0.123 Angstrom", "C) 12.3 Angstrom", "D) 0.0123 Angstrom"], }, { "q": "25. According to Heisenberg's uncertainty principle, the minimum value of the product delta_x * delta_px is:", "opts": [ "A) >= h / (4*pi)", "B) <= h / (4*pi)", "C) = h / (2*pi) exactly", "D) >= h / (2*pi)", ], }, { "q": "26. The uncertainty in position of an electron moving at 3 × 10^4 m/s (uncertainty in velocity = 0.01%) is approximately:", "opts": ["A) 1.93 × 10⁻² m", "B) 1.93 × 10⁻⁴ m", "C) 3.84 × 10⁻² m", "D) 3.84 × 10⁻⁴ m"], }, { "q": "27. The wave function psi for an atomic orbital gives physical information through:", "opts": [ "A) psi itself, which is the probability of finding the electron.", "B) psi^2, which is the probability of finding the electron.", "C) |psi|^2, the probability density (probability per unit volume) of finding the electron.", "D) |psi|^2, which equals the kinetic energy of the electron.", ], }, { "q": "28. For the 1s orbital of hydrogen, the radial probability distribution 4*pi*r^2 * |psi|^2 has its maximum at:", "opts": ["A) r = 0", "B) r = a0 (Bohr radius)", "C) r = 2*a0", "D) r = a0/2"], }, { "q": "29. The threshold frequency for a metal is nu_0. When light of frequency 2*nu_0 falls on the metal, the maximum kinetic energy of emitted photoelectrons is:", "opts": ["A) h*nu_0", "B) 2*h*nu_0", "C) h*nu_0/2", "D) 3*h*nu_0"], }, { "q": "30. The stopping potential for photoelectrons from sodium (work function = 2.3 eV) when irradiated with 300 nm light is approximately:", "opts": ["A) 0.83 V", "B) 1.83 V", "C) 2.30 V", "D) 4.13 V"], }, { "q": "31. The shortest wavelength in the Paschen series of hydrogen corresponds to the transition:", "opts": [ "A) n = 4 to n = 3", "B) n = infinity to n = 3", "C) n = 5 to n = 3", "D) n = 6 to n = 3", ], }, { "q": "32. The number of possible spectral lines observed when an electron in hydrogen de-excites from n = 6 to the ground state is:", "opts": ["A) 5", "B) 10", "C) 15", "D) 6"], }, { "q": "33. In a hydrogen atom, the ratio of the wavelength of the second line of the Balmer series to the first line of the Lyman series is:", "opts": ["A) 27/5", "B) 20/3", "C) 5/27", "D) 3/20"], }, { "q": "34. According to Moseley's law, the square root of the frequency of characteristic Kα X-rays is proportional to:", "opts": ["A) Z", "B) Z^2", "C) (Z - sigma)", "D) (Z - sigma)^2"], }, { "q": "35. The minimum wavelength (Duane-Hunt limit) of X-rays produced in a Coolidge tube at 40 kV is approximately:", "opts": ["A) 0.031 Angstrom", "B) 0.31 Angstrom", "C) 3.1 Angstrom", "D) 0.0031 Angstrom"], }, { "q": "36. The energy required to remove the electron from the n = 2 orbit of a hydrogen atom is:", "opts": ["A) 3.4 eV", "B) 6.8 eV", "C) 1.51 eV", "D) 13.6 eV"], }, { "q": "37. The number of orbitals with quantum numbers n = 4 and l = 3 is:", "opts": ["A) 3", "B) 5", "C) 7", "D) 9"], }, { "q": "38. The orbital angular momentum of an electron in a 3d orbital is:", "opts": ["A) sqrt(2) * h-bar", "B) sqrt(6) * h-bar", "C) sqrt(12) * h-bar", "D) 2 * h-bar"], }, { "q": "39. Which of the following statements are CORRECT?\n" " I. The nucleus of an atom contains protons and neutrons.\n" " II. In Bohr's model, the total energy of the electron is negative.\n" " III. The emission spectrum of hydrogen gives a continuous band of colours.\n" " IV. The de Broglie wavelength of a macroscopic object (mass ~1 kg, speed ~1 m/s) is negligibly small.", "opts": [ "A) I, II and III only", "B) I, II and IV only", "C) II, III and IV only", "D) I, III and IV only", ], }, { "q": "40. The time period of revolution of an electron in a Bohr orbit is proportional to n^3. If T1 : T2 = 8 : 1 for two orbits, the ratio n1 : n2 is:", "opts": ["A) 2 : 1", "B) 1 : 2", "C) 4 : 1", "D) 1 : 4"], }, ] # ---- Build PDF ---- output_path = "/tmp/workspace/structure-of-atom/Structure_of_Atom_MCQs.pdf" doc = SimpleDocTemplate( output_path, pagesize=A4, leftMargin=2*cm, rightMargin=2*cm, topMargin=2.5*cm, bottomMargin=2.5*cm, ) styles = getSampleStyleSheet() title_style = ParagraphStyle( "TitleSty", parent=styles["Normal"], fontSize=18, fontName="Helvetica-Bold", alignment=TA_CENTER, spaceAfter=4, textColor=colors.HexColor("#1a237e"), ) subtitle_style = ParagraphStyle( "SubSty", parent=styles["Normal"], fontSize=12, fontName="Helvetica", alignment=TA_CENTER, spaceAfter=3, textColor=colors.HexColor("#37474f"), ) meta_style = ParagraphStyle( "MetaSty", parent=styles["Normal"], fontSize=10, fontName="Helvetica-Oblique", alignment=TA_CENTER, spaceAfter=10, textColor=colors.HexColor("#546e7a"), ) q_style = ParagraphStyle( "QSty", parent=styles["Normal"], fontSize=11, fontName="Helvetica-Bold", spaceBefore=12, spaceAfter=4, leading=16, ) opt_style = ParagraphStyle( "OptSty", parent=styles["Normal"], fontSize=11, fontName="Helvetica", leftIndent=22, spaceAfter=2, leading=15, ) instr_style = ParagraphStyle( "InstrSty", parent=styles["Normal"], fontSize=10, fontName="Helvetica", spaceBefore=4, spaceAfter=8, leading=14, textColor=colors.HexColor("#37474f"), ) story = [] story.append(Paragraph("Structure of Atom", title_style)) story.append(Paragraph("Practice Questions | JEE Level", subtitle_style)) story.append(Paragraph("Total: 40 Questions | Suggested Time: 60 Minutes | Single Correct Answer", meta_style)) story.append(HRFlowable(width="100%", thickness=1.5, color=colors.HexColor("#1a237e"), spaceAfter=8)) instructions = ( "<b>Instructions:</b> Each question carries 4 marks for a correct answer and -1 for a wrong answer. " "There is no negative marking for unattempted questions. Choose the single most appropriate option. " "No answer key is provided with this paper." ) story.append(Paragraph(instructions, instr_style)) story.append(HRFlowable(width="100%", thickness=0.5, color=colors.HexColor("#90a4ae"), spaceAfter=10)) for i, item in enumerate(mcqs): story.append(Paragraph(item["q"], q_style)) for opt in item["opts"]: story.append(Paragraph(opt, opt_style)) # Add light visual spacing after every 5 questions if (i + 1) % 5 == 0 and i != len(mcqs) - 1: story.append(Spacer(1, 8)) story.append(HRFlowable(width="60%", thickness=0.3, color=colors.HexColor("#cfd8dc"), spaceAfter=2)) story.append(Spacer(1, 24)) story.append(HRFlowable(width="100%", thickness=0.8, color=colors.HexColor("#90a4ae"))) story.append(Spacer(1, 6)) story.append(Paragraph("--- End of Question Paper ---", meta_style)) doc.build(story) print("SUCCESS:", output_path) PYEOF python3 /tmp/workspace/structure-of-atom/generate_mcq.py