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20. What is the term for the opposition to the flow of electric current? A) Resistance B) Conductance C) Inductance D) Capacitance Answer: A 21. A 5 kg block is moving with a velocity of 4 m/s. What is its kinetic energy? A) 20 J B) 40 J C) 80 J D) 100 J Answer: B 22. What is the phenomenon where a wave changes direction as it passes from one medium to another? A) Reflection B) Refraction C) Diffraction D) Interference Answer: B 23. A 1000 kg car accelerates from rest to 20 m/s in 10 s. What is its average power? A) 1000 W B) 2000 W C) 4000 W D) 8000 W Answer: B 24. What is the term for the energy stored in a stretched or compressed spring? A) Kinetic energy B) Potential energy C) Thermal energy D) Electrical energy Answer: B 25. A wave has a frequency of 50 Hz and a wavelength of 2 m. What is its speed? A) 25 m/s B) 50 m/s C) 100 m/s D) 200 m/s Answer: C 26. What is the principle behind the operation of a generator? A) Electromagnetic induction B) Electromagnetic radiation C) Electrostatic induction D) Magnetic resonance Answer: A 27. A 2 μF capacitor is charged to 100 V. What is the energy stored? A) 0.01 J B) 0.1 J C) 1 J D) 10 J Answer: A 28. What is the term for the force that opposes motion between two surfaces in contact? A) Friction B) Gravity C) Normal force D) Tension Answer: A 29. A particle moves with an initial velocity of 5 m/s and accelerates at 2 m/s^2 for 3 s. What is its final velocity? A) 10 m/s B) 11 m/s C) 12 m/s D) 15 m/s Answer: B 30. What is the term for the ability of a material to return to its original shape after deformation? A) Elasticity B) Plasticity C) Viscosity D) Brittleness Answer: A 31. A 10 Ω resistor carries a current of 2 A. What is the power dissipated? A) 20 W B) 40 W C) 60 W D) 80 W Answer: B 32. What is the term for the minimum energy required to remove an electron from a material? A) Work function B) Ionization energy C) Electron affinity D) Binding energy Answer: A 33. A block of mass 2 kg is attached to a spring with spring constant 100 N/m. What is its angular frequency? A) 5 rad/s B) 7 rad/s C) 10 rad/s D) 14 rad/s Answer: B 34. What is the term for the spreading of waves around obstacles or through small openings? A) Reflection B) Refraction C) Diffraction D) Interference Answer: C 35. A 5 A current flows through a 10 Ω resistor. What is the power dissipated? A) 100 W B) 250 W C) 500 W D) 1000 W Answer: B 36. An object is in free fall when: A) It is thrown upward B) It is at rest C) The only force acting on it is gravity D) It moves down Answer: C 37. What phenomenon explains why we see different colors in a rainbow? A) Reflection B) Refraction C) Diffraction D) Dispersion Answer:D 38. *What is the kinetic energy of an object with a mass of 10 kg moving at a velocity of 5 m/s? A) 25 Joules B) 50 Joules C) 100 Joules D) 75 Joules Answer: D 39. What is the formula for calculating gravitational potential energy? A) PE = m C) PE = Fd B) PE = 1/2mv^2 D) PE = mv Answer: A 40. The unit of electric charge is: A) Volt B) Coulomb C) Ampere D) Ohm Answer: B 42. In simple harmonic motion, the acceleration of the object is: A) Directly proportional to its displacement B) Inversely C) Constant Answer:A 44. The phenomenon by which sound waves bend around obstacles is called: A) Refraction B) Reflection C) Diffraction D) Interference 46. What is the main source of energy for the Earth? A) Electrical Energy B) Solar energy C) Wind energy D) Nuclear energy Answer: B 47. the process of converting a gas to solid is known as:** A) Melting B) Deposition C) Freezing D) Condensation Answer:B 50. In a vacuum, all electromagnetic waves travel at: A) Different speeds B) Light speed c) Sound speed D) Varying speeds depending on wavelength Answer: B

COMPILED QUESTIONS FROM JAMB EXAMINATION DAY 1 (PHYSICS)‼️ _These are questions compiled from candidates who wrote their examination on the 24th of April_ _These sets of questions have a high likelihood of having similar appearances in latter exams_ 1. What is the primary purpose of the depletion region in a p-n junction diode? A) To increase the diode's current-carrying capacity B) To reduce the diode's reverse saturation current C) To create a potential barrier for majority charge carriers D) To enhance the diode's switching speed Answer: C 2. Which of the following quantities is a scalar? A) Velocity B) Acceleration C) Displacement D) Temperature "Answer: D 3. What is the implication of the Heisenberg Uncertainty Principle for a particle's position and momentum? A) Both position and momentum can be precisely known simultaneously. B) The more precisely you know a particle's position, the less precisely you can know its momentum. C) The more precisely you know a particle's momentum, the more precisely you can know its position. D) Position and momentum are completely unrelated. Answer: B 4. What is the phenomenon where a particle passes through a potential energy barrier even if it doesn't have enough energy to classically overcome the barrier? A) Tunneling B) Reflection C) Refraction D) Diffraction Answer: A 5. A particle of mass m is attached to a massless spring with spring constant k. The particle is displaced by a distance A from its equilibrium position and then released from rest. What is the speed of the particle when it is at a distance A/2 from its equilibrium position? A) √(3kA^2/4m) B) √(kA^2/2m) C) √(3kA^2/m) D) √(kA^2/4m) Answer: A 6. What is force? A) Joule B) Newton C) Pascal D) Watt "Answer: B 7. Pressure is defined as: A) Force per unit area B) Mass per unit volume C) Energy per unit time D) Work done per unit distance Answer: A 8. A 2 kg block is attached to a spring with a spring constant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position, what is the magnitude of the restoring force exerted by the spring? A) 10 N B) 20 N C) 40 N D) 50 N Answer: B 9. A car accelerates from rest to 20 m/s in What is its acceleration? A) 2 B) 4 m/s² C)5 m/s? D) 10 m/s²: Answer: B 10. A physical pendulum consists of a uniform rod of length L and mass M. What is the period of small oscillations of the pendulum? A) 2π √(L/3g) B) 2π √(2L/3g) C) 2π √(L/g) D) 2π √(3L/2g) Answer: B 11. A 10 μF capacitor is charged to 100 V and then discharged through a 1000 Ω resistor. What is the time constant of the circuit? A) 0.01 s B) 0.1 s C) 1 s D) 10 s Answer: A 12. A body is said to be in motion if it: A) Is at rest B) Changes position with time C) Remains in the same position D) Has constant velocity Answer: B 13. The law of conservation of energy states that: A) Energy can be created and destroyed B) The total energy in an isolated system remains constant C) Energy changes from one form to another D) All of the above Answer:B 14. What is the value of acceleration the surface of the Earth? A) 9.8 m/s? B) 10 m/s c) 9.81 m/s D) 8.9 m/s Answer: C 15. Which of the following statements about waves is true? A) Waves cannot transfer energy B) Waves require a medium to travel C) All waves are transverse D) Waves can be seen when they pass through Answer: B 16. What is the primary function of a fuse in an electric circuit? A) To increase voltage B) To decrease resistance C) To protect against overcurrent D) To filter out AC Answer: C 17. A 10 kg block is lifted vertically upwards by 2 m. What is the work done? (g = 10 m/s^2) A) 100 J B) 200 J C) 196 J D) 400 J Answer: B 18. What is the principle behind the operation of a transformer? A) Electromagnetic induction B) Electromagnetic radiation C) Electrostatic induction D) Magnetic resonance Answer: A 19. A car travels 200 km in 4 hours. What is its average speed? A) 25 km/h B) 50 km/h C) 75 km/h D) 100 km/h Answer: B

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72. In the periodic table, elements in the same group have: A. Same number of protons B. Similar physical properties C. Same number of valence electrons D. Same atomic number Answer: C 73. What is the molecular formula of a compound with empirical formula CH and relative molecular mass of 78? A. CH B. C₂H₂ C. C₆H₆ D. C₄H₄ Answer: C 74. The process of heating ore in the absence of air is called: A. Roasting B. Smelting C. Calcination D. Alloying Answer: C 75. What is the color of methyl orange in acid? A. Yellow B. Orange C. Pink D. Red Answer: D 76. Which ion is responsible for the green color of a flame test? A. Cu²⁺ B. Ba²⁺ C. Fe³⁺ D. Cr³⁺ Answer: B 77. Which of the following is not a chemical property of an element? A. Reactivity B. Valency C. Boiling point D. Ionization energy Answer: C 78. The formula of sodium trioxocarbonate(IV) is: A. NaHCO₃ B. Na₂CO₃ C. NaCl D. NaNO₃ Answer: B 79. What is the bond angle in methane (CH₄)? A. 109.5° B. 120° C. 90° D. 104.5° Answer: A 80. Which of the following is not an organic compound? A. Ethanol B. Benzene C. Glucose D. NaOH Answer: D 81. Which of these compounds has the lowest boiling point? A. H₂O B. NH₃ C. CH₄ D. HF Answer: C 82. A hydrocarbon with general formula CnH2n-2 is an: A. Alkane B. Alkene C. Alkyne D. Alcohol Answer: C 83. The main raw materials for the manufacture of cement are: A. Limestone and clay B. Limestone and coal C. Clay and sand D. Sand and soda Answer: A 84. Which of these does not undergo sublimation? A. Iodine B. Camphor C. Sodium chloride D. Naphthalene Answer: C 85. In the electrolysis of acidified water, the gas collected at the cathode is: A. Oxygen B. Hydrogen C. Chlorine D. Nitrogen Answer: B 86. Which salt is used in photography? A. NaCl B. KNO₃ C. AgBr D. MgSO₄ Answer: C 87. Which compound contains only sigma bonds? A. Ethane B. Ethene C. Ethyne D. Benzene Answer: A 88. The main pollutant in acidic rain is: A. CO₂ B. CH₄ C. NO₂ D. H₂S Answer: C 89. In an endothermic reaction, the enthalpy change is: A. Zero B. Positive C. Negative D. Cannot be determined Answer: B 90. Which substance is commonly used in the laboratory as a drying agent? A. NaCl B. CaCl₂ C. HCl D. CuSO₄ Answer: B 91. A reaction in which heat is absorbed from the surroundings is: A. Exothermic B. Endothermic C. Neutralization D. Decomposition Answer: B 92. Which of the following is an allotrope of carbon? A. Graphite B. Carbon dioxide C. Methane D. Calcium carbide Answer: A 93. The major constituent of glass is: A. NaCl B. SiO₂ C. Al₂O₃ D. CaO Answer: B 94. A redox reaction involves: A. Loss and gain of protons B. Loss and gain of electrons C. Exchange of ions D. Change in physical state Answer: B 95. What is the correct IUPAC name of CH₃CH₂CH₂OH? A. Ethanol B. Methanol C. Propanol D. Butanol Answer: C 96. The hydrocarbon with a triple bond is: A. Ethane B. Ethene C. Ethyne D. Propane Answer: C 97. Which of the following pollutants is most associated with blood poisoning? A. CO B. NO C. SO₂ D. CO₂ Answer: A 98. The process used in softening hard water is: A. Filtration B. Ion exchange C. Distillation D. Boiling Answer: B 99. The main constituent of natural rubber is: A. Polyvinyl chloride B. Polyethylene C. Polyisoprene D. Polystyrene Answer: C 100. Which of the following is used to detect the end-point in acid-base titration? A. Acid B. Base C. Indicator D. Salt Answer: C

37. Which of these is an extensive property of matter? A. Pressure B. Temperature C. Mass D. Density Answer: C 38. In redox reactions, the oxidizing agent is: A. Reduced B. Oxidized C. A base D. Neutral Answer: A 39. The Tetraoxosulphate(VI) acid is commonly known as: A. Nitric acid B. Hydrochloric acid C. Sulphuric acid D. Acetic acid Answer: C 40. Which of the following is used as a drying agent for acidic gases? A. NaOH B. CaO C. P₂O₅ D. Conc. H₂SO₄ Answer: D 41. In electrolysis, the electrode at which oxidation occurs is the: A. Cathode B. Anode C. Electrolyte D. Salt bridge Answer: B 42. The product formed when Na reacts with cold water is: A. NaOH and H₂ B. Na₂O and H₂ C. NaCl and H₂ D. NaOH and O₂ Answer: A 43. Which substance contains both ionic and covalent bonds? A. HCl B. NaCl C. NH₄Cl D. CH₄ Answer: C 44. Which method is suitable for separating a mixture of iron filings and sulfur powder? A. Sublimation B. Evaporation C. Magnetic separation D. Filtration Answer: C 45. What color is litmus in alkaline solution? A. Red B. Blue C. Green D. Yellow Answer: B 46. Which of the following has the highest boiling point? A. H₂S B. NH₃ C. H₂O D. CH₄ Answer: C 47. What is the electronic configuration of Ca (Z=20)? A. 2,8,8,2 B. 2,8,10 C. 2,8,6,4 D. 2,10,8 Answer: A 48. Which of the following hydrocarbons is saturated? A. Ethene B. Ethyne C. Ethane D. Benzene Answer: C 49. Which halogen is least reactive? A. Fluorine B. Chlorine C. Bromine D. Iodine Answer: D 50. An isotope of hydrogen with 1 proton and 2 neutrons is: A. Protium B. Deuterium C. Tritium D. Hydrogen ion Answer: C 51. Which of the following is used to prevent rusting? A. Galvanization B. Distillation C. Polymerization D. Sublimation Answer: A 52. The indicator used in strong acid–strong base titration is: A. Methyl orange B. Phenolphthalein C. Litmus D. Universal indicator Answer: B 53. The pH of a neutral solution is: A. 14 B. 7 C. 0 D. 1 Answer: B 54. Which of the following is a noble gas? A. Nitrogen B. Argon C. Oxygen D. Neon Answer: B 55. What is the main component of limestone? A. Na₂CO₃ B. CaCO₃ C. CaCl₂ D. CaSO₄ Answer: B 56. A catalyst increases the rate of a reaction by: A. Increasing temperature B. Lowering activation energy C. Increasing pressure D. Changing equilibrium position Answer: B 57. Which of the following is not an alloy? A. Steel B. Bronze C. Brass D. Diamond Answer: D 58. A salt formed from a strong acid and a strong base is: A. Acidic B. Basic C. Neutral D. Amphoteric Answer: C 59. Which gas turns limewater milky? A. CO₂ B. O₂ C. N₂ D. CH₄ Answer: A 60. An example of a deliquescent substance is: A. NaCl B. CuSO₄ C. NaOH D. CaCO₃ Answer: C 61. The movement of particles from a region of higher concentration to a region of lower concentration is called: A. Diffusion B. Filtration C. Osmosis D. Effusion Answer: A 62. What is the oxidation state of chlorine in NaClO₃? A. +1 B. -1 C. +3 D. +5 Answer: D 63. Which of these is a strong acid? A. CH₃COOH B. HNO₃ C. H₂CO₃ D. HCN Answer: B 64. Which process involves loss of electrons? A. Reduction B. Neutralization C. Oxidation D. Ionization Answer: C 65. The ability of an atom to attract shared electrons is called: A. Ionization energy B. Electron affinity C. Electronegativity D. Atomic radius Answer: C 66. Which of these compounds will give a precipitate with AgNO₃? A. NaCl B. CH₄ C. NH₃ D. NaOH Answer: A 67. The separation technique used to purify ethanol is: A. Sublimation B. Fractional distillation C. Filtration D. Decantation Answer: B 68. Which of the following is not a greenhouse gas? A. CH₄ B. N₂O C. O₂ D. CO₂ Answer: C 69. The type of bond formed between two nonmetals is: A. Ionic B. Covalent C. Metallic D. Hydrogen Answer: B 70. Which substance is added to water to kill germs? A. Salt B. Lime C. Chlorine D. Alum Answer: C 71. The electronic configuration of a chlorine atom (Z=17) is: A. 2,8,7 B. 2,7,8 C. 2,6,9 D. 2,8,8,1 Answer: A

*JAMB QUESTIONS ON CHEMISTRY* 1. Which of the following is a chemical change? A. Melting of ice B. Boiling of water C. Rusting of iron D. Breaking of glass Answer: C 2. What is the oxidation number of sulfur in H₂SO₄? A. +4 B. +6 C. -2 D. 0 Answer: B 3. Which of the following gases is not a greenhouse gas? A. CO₂ B. CH₄ C. N₂ D. H₂O vapour Answer: C 4. Which particle has the same number of protons and electrons but different number of neutrons? A. Isomer B. Isotope C. Ion D. Molecule Answer: B 5. What is the molar volume of an ideal gas at STP? A. 22.4 dm³ B. 24 dm³ C. 1.0 dm³ D. 2.24 dm³ Answer: A 6. Which of the following represents a covalent compound? A. NaCl B. MgO C. H₂O D. CaCl₂ Answer: C 7. Which of these processes is endothermic? A. Freezing of water B. Condensation of steam C. Dissolution of NH₄Cl in water D. Combustion of methane Answer: C 8. What is the pH of a solution with [H⁺] = 1 × 10⁻⁴ mol/dm³? A. 4 B. 10 C. 7 D. 2 Answer: A 9. What is the IUPAC name of CH₃CH₂OH? A. Methanol B. Ethanol C. Propanol D. Butanol Answer: B 10. Which of the following is an alkyne? A. C₂H₆ B. C₂H₄ C. C₂H₂ D. CH₄ Answer: C 11. What is the main ore of aluminum? A. Hematite B. Bauxite C. Galena D. Magnetite Answer: B 12. Which of these elements has the highest electronegativity? A. Fluorine B. Oxygen C. Nitrogen D. Chlorine Answer: A 13. What is the formula mass of Na₂CO₃? A. 106 g/mol B. 84 g/mol C. 40 g/mol D. 23 g/mol Answer: A 14. What is the oxidation number of Mn in KMnO₄? A. +2 B. +4 C. +6 D. +7 Answer: D 15. Which of the following is a base? A. H₂SO₄ B. NaOH C. HCl D. CO₂ Answer: B 16. Which of the following shows periodicity? A. Atomic number B. Isotopy C. Mass number D. Ionization energy Answer: D 17. Which of the following is not a property of acids? A. Sour taste B. Turns blue litmus red C. Reacts with bases D. Soapy feel Answer: D 18. The major constituent of natural gas is: A. Methane B. Ethane C. Butane D. Propane Answer: A 19. What is the number of neutrons in ³⁹₁₉K? A. 20 B. 19 C. 39 D. 58 Answer: A 20. The process of separating liquids with different boiling points is called: A. Filtration B. Crystallization C. Distillation D. Sublimation Answer: C 21. What is the shape of the water molecule? A. Linear B. Tetrahedral C. Angular (V-shaped) D. Trigonal planar Answer: C 22. Which element forms a basic oxide? A. CO₂ B. SO₂ C. Na₂O D. NO₂ Answer: C 23. The number of unpaired electrons in an oxygen atom is: A. 0 B. 1 C. 2 D. 4 Answer: C 24. Which of the following has giant covalent structure? A. NaCl B. H₂O C. Diamond D. CH₄ Answer: C 25. Which of the following gases is monoatomic? A. O₂ B. N₂ C. Ne D. Cl₂ Answer: C 26. Which process is used to obtain pure water from salt water? A. Filtration B. Decantation C. Distillation D. Crystallization Answer: C 27. Which of these best describes the solubility of gases in water? A. Increases with temperature B. Decreases with pressure C. Increases with pressure D. Independent of pressure Answer: C 28. Which of the following undergoes addition reaction? A. Alkane B. Alkene C. Alkyne D. Aromatic hydrocarbon Answer: B 29. What is the empirical formula of a compound with 40% C, 6.7% H, and 53.3% O? A. CHO B. CH₂O C. C₂H₄O₂ D. C₆H₁₂O₆ Answer: B 30. The monomer of polyethylene is: A. Ethene B. Ethane C. Propene D. Methane Answer: A *By: HCCTEAM* 07043739142 31. Which of these metals will not liberate hydrogen from dilute HCl? A. Zinc B. Iron C. Copper D. Magnesium Answer: C 32. The device used to measure atmospheric pressure is called: A. Thermometer B. Barometer C. Hygrometer D. Manometer Answer: B 33. The compound that decolorizes bromine water is: A. Ethane B. Ethene C. Methane D. Ethanol Answer: B 34. What is the major constituent of air by volume? A. Oxygen B. Nitrogen C. Carbon dioxide D. Argon Answer: B 35. Which of the following is an amphoteric oxide? A. Na₂O B. ZnO C. CO₂ D. SO₂ Answer: B 36. A solution that resists change in pH is a: A. Salt B. Base C. Buffer D. Acid Answer: C

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