Thanawiya Amma (Egypt) · Physical and Natural Sciences

General Physics and Physical Chemistry

65 practice questions, each with the answer and an explanation.

Practise General Physics and Physical Chemistry now

Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 65 questions

  1. According to Faraday's law of electromagnetic induction, what determines the magnitude of induced electromotive force (EMF) in a coil?
  2. Which transition in the hydrogen atom emission spectrum produces a spectral line in the visible region (Balmer series)?
  3. In a galvanic cell with zinc and copper electrodes, what reaction occurs at the copper cathode?
  4. What happens to the equilibrium position of the exothermic reaction when temperature is increased?
  5. In a series RLC circuit at resonance, what is the phase difference between the total voltage and the current?
  6. What is the functional group that distinguishes alcohols from other organic compounds?
  7. What is the de Broglie wavelength of an electron of mass moving with velocity ?
  8. Which transition metal ion forms a colored aqueous solution due to partially filled d-orbitals?
  9. What is the primary factor that causes the Compton shift during photon-electron scattering?
  10. Which organic compound is formed by the controlled catalytic hydration of ethyne (acetylene) in the presence of and at ?
  11. A transformer has 500 primary turns and 100 secondary turns. If the input primary AC voltage is , what is the secondary output voltage assuming 100% efficiency?
  12. Which law states that the mass of a substance deposited or liberated at an electrode during electrolysis is directly proportional to the quantity of electricity passing through the electrolyte?
  13. What is the optical device that produces a continuous emission spectrum when illuminated by incandescent white light?
  14. What product is obtained when nitrobenzene is reduced with tin and concentrated hydrochloric acid?
  15. In a photoelectric experiment, what happens to the maximum kinetic energy of emitted photoelectrons if the intensity of incident light is doubled while keeping frequency constant above threshold?
  16. What is the pH of a solution of hydrochloric acid () at ?
  17. What is the main operating principle of a laser device?
  18. Which reagent distinguishes phenol from ethanol by forming a violet color?
  19. According to Lenz's law, what is the direction of an induced current in a closed loop?
  20. What is the hybridization of carbon atoms in benzene ()?
  21. Two parallel conductors carrying electric currents in the same direction exert which type of magnetic force on each other?
  22. Which catalyst is industrially used in the Haber-Bosch process for synthesis of ammonia from nitrogen and hydrogen?
  23. What type of semiconductor is produced when pure silicon is doped with trace amounts of phosphorus?
  24. What is the IUPAC name for the organic compound with structure ?
  25. What is the effect of adding a positive catalyst to a chemical reaction at constant temperature?
  26. In a mass spectrometer, ions of identical charge and speed are deflected by a uniform perpendicular magnetic field . What is the relationship between the radius of circular path and ion…
  27. Which property explains why transition metals and their complexes frequently act as effective heterogeneous catalysts?
  28. What is the total charge in coulombs required to deposit 1 mole of aluminum () from molten aluminum oxide () via electrolysis? (1 Faraday = )
  29. A kg block slides from rest down a frictionless slope of vertical height m onto a rough horizontal surface with . Taking , how far does it slide on the rough…
  30. A ball is launched at above the horizontal. Ignoring air resistance, what is the ratio of its kinetic energy at the highest point to its kinetic energy at launch?
  31. A V battery with negligible internal resistance is connected to a resistor in series with a parallel pair of and resistors. What current flows through the…
  32. A converging lens of focal length cm forms an image of an object placed cm in front of it. What are the image distance and the nature of the image?
  33. In a L vessel, mol of decomposes: . At equilibrium mol of is present. What is ?
  34. mL of M HCl is mixed with mL of M NaOH at C. What is the pH of the resulting solution?
  35. g of iron is heated with g of sulfur to form (, ). What is left over after the reaction is complete?
  36. What is the period of a wave of frequency 100 Hz?
  37. A force of 500 N acts at right angles on an area of 0.5 m². What pressure results?
  38. Which organelle is the main site of aerobic respiration in a eukaryotic cell?
  39. What is the period of a wave of frequency 200 Hz?
  40. Three resistors of 25 Ω, 15 Ω and 29 Ω are in series. What is the total resistance?
  41. What gravitational potential energy does a 3 kg mass gain when lifted 17 m? (Use m/s².)
  42. A ball is kicked at 40 m/s at to level ground. What is its range? (Use m/s², ignore air resistance.)
  43. A force of 400 N acts at right angles on an area of 2 m². What pressure results?
  44. A 10 kg ball changes its speed by 9 m/s in 0.2 s because of a constant force. How large is the force?
  45. An object is 15 cm from a converging lens of focal length 10 cm. How far from the lens is the image?
  46. A cell of emf 6 V and internal resistance 1 Ω drives a 4 Ω resistor. What is the current?
  47. How many molecules are in 0.25 mol of C₆H₁₂O₆? (Avogadro constant per mol)
  48. A machine takes in 200 J and gives out 50 J of useful energy. What is its efficiency?
  49. A compound contains 72 g carbon, 16 g hydrogen and 32 g oxygen. What is its empirical formula? (C = 12, H = 1, O = 16)
  50. A force of 100 N moves an object 2 m in the direction of the force. How much work is done?
  51. A car starts at 9 m/s and accelerates uniformly at 3 m/s² for 2 s. How far does it travel?
  52. A cell of emf 12 V and internal resistance 1 Ω drives a 8 Ω resistor. What is the current?
  53. 10 mL of 0.5 mol/L HCl is neutralised by 0.1 mol/L NaOH. What volume of NaOH is needed?
  54. Why are noble gases unreactive?
  55. In , what mass of water forms from 6 g of hydrogen with excess oxygen? (H = 1, O = 16)
  56. 28 g of KOH is dissolved to make 2 L of solution. What is the concentration in mol/L? (Relative atomic masses: K = 39, O = 16, H = 1.)
  57. A stone is thrown vertically upwards at 40 m/s. What maximum height does it reach? (Use m/s².)
  58. A transformer has 1000 turns on the primary and 5000 turns on the secondary. If the primary voltage is 110 V, what is the secondary voltage?
  59. What is the weight of a 1 kg object? (Use N/kg.)
  60. A 5 kg ball changes its speed by 8 m/s in 0.5 s because of a constant force. How large is the force?
  61. Which type of radiation is the most penetrating?
  62. A gas has volume 10 L at 327 °C. At constant pressure it is heated to 27 °C. What is its new volume?
  63. What is the mass of 2 mol of H₂O? (Relative atomic masses: H = 1, O = 16.)
  64. How many moles are there in 10 g of NaOH? (Relative atomic masses: Na = 23, O = 16, H = 1.)
  65. 10 g of NaOH is dissolved to make 2 L of solution. What is the concentration in mol/L? (Relative atomic masses: Na = 23, O = 16, H = 1.)

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